Kt88 Pentode

Matched quad. Last Update: Description. So the voltage gain of a pentode preamp is roughly these two extremes divided by the grid voltage swing needed to create them. BEAM PENTODE Base: OCTAL Uf = 6,3 V If = 1,6 A Typical Characteristics: U a = 250 V U g2 = 250 V I a = 140 mA I g2 = max. Pdf El34 Datasheet Pdf Pentode Datasheetspdf Com Nosound 8 Pin Wzmacniacz Lampowy Płyta Prąd Polaryzacji Tester Sondy Gniazdo Dla 6l6 6v6 El34 Kt88 6550 | pdf. The KT88 was invented by Marconi-Osram Valve Co. The triode version will provide a greater power reduction and is more linear (less distortion) than the pentode. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. From Sound Practices Issue 2, Fall 1992. UTRA - LINEAR CONNECTION - Vg1=OV -lov TAPS la(mA) 6550 Vg2=kon. And there you have it. The output power is 50 watts from 20Hz to 20KHz at approx 0. The amp develops a minimum of 60 watts in pentode and 30 watts in triode. Sharp cutoff pentode, miniature type used as an audio amplifier in applications requiring reduced microphonics, leakage noise and hum. 0 20161216) Select tube from the list. KT88 Pipe Tube 8pin Octal Power Pentode. my amp is a Ekco amp that uses KT88 tubes and my speakers are Focal 926 and the speakers are new under 2 weeks old. In effect, although the double-triode only had a flat gain bandwidth of around 15 kHz, the pentode-triode extended this to above 150kHz. Warm, detailed and well controlled sound at an unbeatable price. 38) Posted by SandroN on 2006-07-20, 15:50:00 (201. Around 15 W Class A and 25 W music power are still available. The KT series of tubes was developed by MO-Valve aka Genalex in response to Mullard’s development of the pentode. , it delivers 35 to 50 watts per tube and was original equipment in Ampeg SVT and Marshall amps during the '70s and early '80s. Find out all of the information about the RS PRO product: pentode thermionic valve 6784120. Gec Kt88, 12ax7 Nos, Tesla Valves & Vacuum Tubes; Click to enlarge. Other than 6L6GC that comes with the kit, KT66, KT88, EL34, 6550, etc can also be used. Note, not all oscilloscopes have intensity modulation. Sharp cutoff pentode, miniature type used as an audio amplifier in applications requiring reduced microphonics, leakage noise and hum. Power amp presence and depth controls. website! We have added a shopping cart for easier ordering and an improved search feature. are the KT88, KT100, KT120 and KT150 Tubes safely interchangable generally speaking in a well built tube amplifier? The KT120 and KT150 are both pentode devices and the KT88 and KT100 are described as beam tetrodes so no, I wouldn't think these can be easily interchanged even though the data sheets have the same "pin-out". The Fig 5 circuit has 25% of the Va-k fed back to the cathode. Especially striking is the large output-power capability of the Super-Pentode (circuit 5), delivering up to an unusual 80W with only two EL34 tubes. The KT88 is a common surrogate for the 6550. It also allows the feedback from the ultralinear tap to be coupled directly to the KT88 control grid. Very powerful, with strong bass and very bright highs. Additionally, an auto bias or semi-auto bias amp might be able to bias a tube from another "family". SUBSCRIPTS FOR MULTI-UNIT TUBES: b = Beam Power Unit. Came in for a checkup, seems it’s been shaken around a bit to much over some mountain roads and started making crackling and noises. Near equivalent of 6BQ5 / EL86 / EL84. The amplifier is based on Mikael Abdellah's single-ended KT88 tube amplifier circuit. Has anyone compared KT88 beam power tubes wired in triode versus pentode configuration? I have to replace the octal sockets in my heavily modified ST-70 and I need to know whether to go triode on the output section. Both valves use the same large octal base arranged in the same pin configuration for Anode, Screen, Grid and Cathode, including the 6. from the anode of the 12AX7 to a B+ point before the output. KT88 SE tube amplifier circuit, triode Ultra Linear switchable, TSO Tube Master - Pentode or Triode Treble Booster ( Rangemaster ) - Duration: 3:46. 95: Triode USA Dynaco Mk3 Tube DIY Amp Kit. Very powerful, with strong bass and very bright highs. At 30W, this tube delivers plenty of headroom. A beam power pentode with 50W anode dissipation. El34 vs el34b. 37 + AU $250. website! We have added a shopping cart for easier ordering and an improved search feature. Buy RS PRO Pentode Thermionic Valve, B9A Base, 12W, 6. All this adds up to greater efficiency and lower distortion than a regular tetrode or pentode. A typical triode audio power amplifier will have a driver that provides voltage gain, coupled to a triode (like 2A3 and 300B) or a pentode or kinkless tetrode such as EL34 or KT88 connected as a triode, connected to the loudspeaker through an audio transformer in a common cathode arrangement. Detailed Description: (measurement in mm) EL84-T is high transconductance pentode, used as class A1, AB1 and B in audio amplifier. KT88/ 6550 / KT90 / KT100 / KT120 / KT150 (Pair / Block) - Direct Plug & Play* 60 Watts (Total Harmonic Distortion: Less than 1% at Rated Output) 65W @ 2% , 68W Max Output. ) x 125mm or other Double Triode Valves online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. (2) 12J5GT Tung-Sol, NOS/NIB, 60s vintage grey plates, $7. Vacuum Tube Supplies, LLC. Neumann used the 13CW4 triode nuvistor in the famous U47 and U48 mics for a while when the Telefunken VF14 pentode wasn't available anymore. The first popular beam tetrode was the RCA 6L6, introduced in 1936. 4P1L PENTODE DRIVER (4p1l_pentode_1335. In a pentode a fifth element, the suppressor grid was added to reduce secondary emissions and ensure maximum electron transfer from the cathode to the plate. 75" H x 17" W. Welcome to the new and improved Vacuum Tubes, Inc. t = Triode Unit. -6550’s and KT88’s are more or less interchangeable. The 65V-1 integrated amplifier ($4000) uses EL34 or KT88 pentode tubes—at the time of purchase, the user specifies his or her preference—and is made by mainstream manufacturer Rogers High Fidelity, in Warwick, New York. Classifieds: FOR SALE - Spectacular KT88 Triode/Pentode power amplifier North Audio Stage Master 25 asking for $12800. Bias adjustment with a Cathode-direct meter. A pentode config quitar amp with a high B+ and lower screen where THD can run wild with piles of intermodulation is highly attractive sonically. These are less common, and are actually a completely new type having been introduced in or around 1990. Originally manufactured in the United States by G. I cannot get the same clean out of that channel in pentode mode with the volume just turned down. -6550's and KT88's are more or less interchangeable. The Retro225 7591A / 5B/255M > 0. A KT88 is a beam powered tetrode, whereas a 6CA7 (EL34) is a power pentode. It may be used with triode, pentode, or ultralinear (screen tap connection) wired tube arrangements. The board contains high quality components such as Dale non-magnetic resistors and 1% metal film resistors. A small meter at the rear of the chassis was provided for measuring bias and AC balance. Generally compatible with: 6AK5 EF95 6096 6F32V 6J1 403A 731A PM05 CK604A 5654 CV850 GL-5654 M8100 6AK5W types. KT88 Pipe Tube 8pin Octal Power Pentode. Mullard KT88, Beam Pentode, 8 Pin, Original Box, Russia This item is temporarily out of stock, please inquire for lead time by sending us your wishlist. the original MO Valve Genalex datasheet calls the KT88 a beam tetrode. This review reflects their use in this context, which gives particularly good insight into the tubes' qualities as the amp is very revealing. Typically high power single-ended amplifiers are either run in pentode or using exotic power tubes; we opted for a push-pull based amplifier; the larger version of the Stereo 15. By simply changing the power mode, 6V6, 6L6/EL34 and most of the KT series tubes can be used. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. The TELEFUNKEN Elektroakustik KT88-TK is a newly manufactured and cryogenically treated version of the legendary KT88. Now, with that out of the way, there is a fair amount of difference in how these tubes sound. , I re-installed the 6L6G and, sure enough, I stand by my words. The purpose of this KT88 / KT66 /6550 / KT90 / KT120 page is to give an overview about what KT66, KT88. Has anyone compared KT88 beam power tubes wired in triode versus pentode configuration? I have to replace the octal sockets in my heavily modified ST-70 and I need to know whether to go triode on the output section. Shop Vacuum Tubes by Brand, Class, Model, Package, Replacement Type, Price, Ratings & Reviews & more. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. The resulting sound character of this DAC is a whole level better than obtainable from any noval or octal tube, forget Ecc88, ECC82, 6SN7 or the like. Classifieds: FOR SALE - Spectacular KT88 Triode/Pentode power amplifier North Audio Stage Master 25 asking for $12800. High power output tube KT120(Super KT88) 100W/ch(1KHz) at Pentode circuit (70W/ch at Triode). Since a pentode has very high plate resistance, the driver’s output impedance is dominated by the plate load resistance, which needs to be low enough to provide plenty of drive to the KT88 control grid. This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. EL34 tubes can also take high voltage up to maximum 800V to deliver high power output. ) will change optimum plate to plate load impedance. KT88 tetrode High plate dissipation beam tetrode. If you require matched pairs or quads, simply order 2 or 4 off. The preamp section has four line levels and there are speaker taps for both 4-ohm and 8-ohm impedances. Of course, presence is not its strong suit. HiFi KT88 Vacuum Tube Amplifier Home Stereo Audio Single-Ended Class A Power Amp. Here's a step by step for using the generic triode model with LTSpice. 76 A More Info ». like Id call cd a more cold sound (digital) and vinyl (organic) a more warm sound. KT88 Pipe Tube 8pin Octal Power Pentode. The KT88 / KT66 /6550 Directory. 6550-KT88-KT90-KT120; EZ81-6CA4-CV5072; 5840/ EF732-ADZAM Adzam Adzam EF732 is a high-quality sub-miniature pentode that is well known for its extremely low noise. The Tube Amp Doctor KT88-STR is build just like the original tube with its thick curved glass envelope and metal base. Typically high power single-ended amplifiers are either run in pentode or using exotic power tubes; we opted for a push-pull based amplifier; the larger version of the Stereo 15. In 1957 Marconi-Osram Valve Co. This is the most musical amp I have ever listened to,It is full of resolution and emotion. 6 and El-34, and is one of the largest tubes in its class. Pentode simulator. it features gold-plated grid, tri-plate anode and a single piece beam electrode. KT88 (6550 equivalent) Genalex GOLD LION reissue, new productionMATCHED PAIR: Looks and sounds like the 1960s vintage Genalex Gold Lion KT88, one of the most famous vintage power tubes in the world. Oct 22, 2016 - FEBRUARY 2016 , CARY SLP 80 , TRIODE. Ditto for the 6550 tubes, which are known as a beam tetrode. The similarities don't stop with its attractive appearance. The TU-8800 is a single-ended power amp kit that supports many popular octal-base pentode and beam power tubes. StereoTimes� Most Wanted Component Award 2017 for Challenger 115. Puhhleeze: push pull? Not SE? Not class A? No triode but pentode? Local feedback? Chinese tubes ??? But after minimal cleanup - it surprised me a lot. Each pentode is inspected, The KT88-STr is the only KT88 on market with consistently low Ig1 200nA at 500V Ua and Ug2 operating. It can be very high gain with no load (can even destroy the output transformer and tube in some no-load instances). cdyas10-24-2007, 03:06 PM My vox heritage AC15 has a pentode/triode switch for the EF86. And the gain is entirely dependent on the load. The green idle lines show the idle bias, quiescent or Q point. • Octal pentode power tubes (6L6GC, KT88) • Power triodes and diodes (2A3/300B, 5Y3) • Jumper (any 7, 8, or 9 pin tube) Connections Connecting a VacuTrace is simple. From JJ:KT88 is a beam output pentode with an octal base and power of 42W. Octal power tube (Max Plate Watts = 25W) EL34B(with shadow grid) is a high performance improved version of pentode EL34A to solve the problem of overheated No. The quick answer to the difference between EL34 vs 6CA7 or EL34 vs KT77 is simple. A generic diagram of a pentode is illustrated below. The amplifier is based on Mikael Abdellah's single-ended KT88 tube amplifier circuit. The amplifier stage is based on the Compact Hi-Fi Power Amplifier by Melvin Leibowitz. 6CA7/EL34B Tube, Power Amplifier Pentode, China. The KT series of tubes was developed by MO-Valve aka Genalex in response to Mullard’s development of the pentode. 2 Implimentation of the Four Key Features The truly unique characteristic of the STC amplifier comes from the first of the four key features. A KT88 is a beam powered tetrode, whereas a 6CA7 (EL34) is a power pentode. ) x 125mm or other Double Triode Valves online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. 678-4114 12AX7. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. The resulting sound character of this DAC is a whole level better than obtainable from any noval or octal tube, forget Ecc88, ECC82, 6SN7 or the like. While the latter could be inserted in the socket and used without problems, the output power would be lower, and the sound inferior, due to a lower current draw in the same circuit. few amplifier use 2. 12) Hi, My Power amp is KT88 SE (triode mode via 100 ohm)with B+ = 400V, Ia = 80mA, Load = 3000. You owe it to yourself to hear what such pentode system can do. Pentode Connection 250 250 -14 140 12 11. GEC Data sheet issue 5 1977 ~ Valve Manufacturers application data & Adverts ~ Brimar 40W push-pull pentode. KT120 Amp Mk. The main features of this DAC are:. These are less common, and are actually a completely new type having been introduced in or around 1990. Very powerful, with strong bass and very bright highs. The 6L6 was an American-designed tube to circumvent the patent Philips held for their pentode design. Both valves use the same large octal base arranged in the same pin configuration for Anode, Screen, Grid and Cathode, including the 6. There are many pentode good for audio amplifiers but the most common in the current production are the EL34, 6550 and the KT88 so follows a compare table with the main characteristics and. This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. Basically it is the application of a portion of the audio output signal (typically 20 percent) returned to the tube screen grid, which alters the behavior of the electron stream passing through the tube from cathode to anode. Last Update: Description. 5Kohm and plate current are appx. Audio Hifi Tubes. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. Find out all of the information about the RS PRO product: pentode thermionic valve 6784120. 76 A More Info ». You'd need to lower the screen voltage considerably for this option. 1% distortion plus noise. - UL, Triode and Pentode output mode - LOW ESR conductive polymer hybrid aluminium cathode Bypass capacitor- Headphone impedance can be selected by changing the jumper location. That means that is has ‘just’ four elements. Generally compatible with: 6AK5 EF95 6096 6F32V 6J1 403A 731A PM05 CK604A 5654 CV850 GL-5654 M8100 6AK5W types. 678-4105 12AU7 ECC82 Double Triode, B9A base. 50 Watt, KT88-based Monoblock Power Amplifiers These are a pair of hand built, point-to-point wired, Class AB1 pentode power amplifiers. It offered the benefits of reliability and a relatively high power output. KT88 Svetlana Power Pentode. Audio Hifi Tubes. The top honours went to MOV for their KT range, especially the KT66 and later the KT88. Possible use KT66, KT77, KT88, KT90, 5881, 6550, EL34 (6CA7) RATED OUTPUT 6L6GC (UL mode): 8W + 8W (8 Ω load, 1kHz) 6L6GC (Pentode): 8. The change to a pentode-triode was a development by Arthur Bailey and has a dramatic effect on the open loop gain of the amplifier. Buy RS PRO Pentode Thermionic Valve, Octal Base, 25W, 6. You can: choose among most common power vacuum tubes (I am slowly adding more), set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode,; set Single-Ended or Push-Pull configuration ; set the Power Supply V+ voltage, the screen voltage. Poster, JJ Electronics, 2 Pack, Includes KT88 & E34L - Two pack of JJ Electronics posters, including a KT88 poster and an E34L poster, both measuring at 24. Measurements - Push-Pull KT88 Tube Amplifier (12SL7 Driver) Measurements were made using a HP 331A distortion analyzer, Tenma Low Distortion Signal Generator (0. Less powerful KT88 or 6550 types should be operated at Power Low. Current production EL34 tubes closely resemble Mullard pentode design. The newest version of the classic European power Pentode, made in one of our Chinese affiliate. Basically it is the application of a portion of the audio output signal (typically 20 percent) returned to the tube screen grid, which alters the behavior of the electron stream passing through the tube from cathode to anode. When used in AB1 mode, two tubes can output over 35W. Your mileage may vary here, however. The tube will idle at 340 plate-to-cathode volts and 32ma. The Fig 5 circuit has 25% of the Va-k fed back to the cathode. beam pentode Base: OCTAL Uf = 6,3 V If = 1,6 a Typical Characteristics: U a = 250 V U g2 = 250 V I a = 140 ma I g2 = max. It can also be used in 6550 amplifiers. 0 mA/V allied to a maximal anode dissipation level of 25W with a sub 1. The 6V6 is a lower-voltage, lower-power (350-V, 14-W) beam power tube (see Photo 3). The pentode contributed to the electronic preponderance of the Allies. If you want to hear the difference between the various pentode/tetrode tube types, go to Deja Vu Audio in Tyson's Corner; this store sells only tube gear (except for used trade-in solid state gear) and they have quite an amazing. -30V PLATE CHARACTERCTICS 6550. Make offer - 1PCS KT88/6550 tube. from the anode of the 12AX7 to a B+ point before the output. Can replace KT88s or 6550s. Originally manufactured in the United States by G. 5E3 Deluxe 6V6GT Pentode Power Tube. Push Pull Class AB1 Pentode Fixed Bias. The KT88-TK is a beam-power tetrode that shares similar applications as the 61. Maximum anode dissipation is 25W and output power of single tube is over 10W in A1 amplification mode. Pentode Amplifier. ) x 115mm or other Double Triode Valves online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. The Fig 5 circuit has 25% of the Va-k fed back to the cathode. Output transformer: Japan Z11 0. Pentode 2 x 60 WRMS (Sinus) at 8 Ω Triode 2 x 30 WRMS (Sinus) at 8 Ω Installed Tubes Pre-Amplifier/Driver: 4 x 6SN7GT – Tung-Sol Frequency Response Power Amplifier: 4 x KT88 SED – S-Logo (Svetlana) 16 Hz – 20 kHz ± 0. For 9-Pin power tubes like the EL84 the plate is pin 7 and the cathode is pin 3. The KT88 is a Beam power valve with an anode/plate dissipation [originally] of around 35 watts, it is sometimes referred to as a pentode by some people, but in fact the clue is in the title “KT” which stands for “kink-less tetrode” The main feature differences in the Kink-less Tetrode compared to the Pentode [and early Tetrode’s] was. like Id call cd a more cold sound (digital) and vinyl (organic) a more warm sound. 2W – 6L6GC (Triode) 4W + 4W. It can be very high gain with no load (can even destroy the output transformer and tube in some no-load instances). It is more than adequate for this task. Kt150 Amplifier Schematic. Amb un funcionalment molt semblant al tríode, té tres reixetes en comptes d'una sola. As far as sound goes, IMHO, most 6550's have a "tubier" sound than KT88's with perhaps a little more mid-bass. I have succeeded in designing the perfect amp for the modern pedal steel player. A pair of these 6550 KT88 Matched Pair beam pentodes in push pull can easily provide 100 watts of audio power and they come with a test certificate showing the supermatching parameters. The system can be linear or non-linear, it can be an amplifier or a regulator. KT88 is a beam output pentode with an octal base and power of 42W. This calculator allows you to compute and tune loadline and operating point of tube amplifiers' power stages. KT90 is a beam-power pentode primarly designed for use in audio frequency power amplifier applications. This KT88 offers a lively and dynamic tone that is ideal in both HiFi audio amplifiers and high wattage guitar / bass amps. 7 ma U g1 = -15 V S = 11,5 ma/V R i = 12 kΩ µ-g1-g2 = 8 Triode Connected U a, g2 = 250 V I a+g2 = 147 ma U g1 = -15 V S = 12 ma/V R i = 670 Ω µ = 8 Red/Blue versions available max 125,0 max 52,0 max 110,0. The rated power is high enough to make soft and strong in low frequency. The 6P14P-EV is a direct equivalent to the 7189. The EL34 being a true pentode sounds a bit rough and fluffy, even clean. KT88 is a beam output pentode with an octal base and power of 42W. Can replace KT88s or 6550s. Likewise, current production 6CA7 are beam-forming tetrode like the original Sylvania design. When I mean warm I mean more organic in sound, rounded sound, soft bass and soft treble not stabbing treble or high pitched treble but warm is a more rounded sound rather than an aggressive sound. The tube will idle at 340 plate-to-cathode volts and 32ma. ) x 115mm or other Double Triode Valves online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. Source Legend: DC Dave Cigna / Francesco Piazza DM Me! The above SPICE models for various valves and most of. The calculator: plots the anode characteristic graph, for the chosen operation modality, plots the. The KT88 is a Beam power valve with an anode/plate dissipation [originally] of around 35 watts, it is sometimes referred to as a pentode by some people, but in fact the clue is in the title “KT” which stands for “kink-less tetrode” The main feature differences in the Kink-less Tetrode compared to the Pentode [and early Tetrode’s] was the use of two shaped metal plates that ran the length of the grids and was placed outside the grid support rods but within the anode cylinder. It was designed in 1937 and used mostly in single-ended output stages of radio and TV sets. If you want to hear the difference between the various pentode/tetrode tube types, go to Deja Vu Audio in Tyson's Corner; this store sells only tube gear (except for used trade-in solid state gear) and they have quite an amazing. Background Information. Very powerful, with strong bass and very bright highs. It can also be used in 6550 amplifiers. t = Triode Unit. The KT88 is a kinkless tetrode, i. The 6V6GT Beam Power Pentode is rated at a maximum of 14 Watts. 4 x 6P14P-EV (upgraded milspec EL84)tubes. I have succeeded in designing the perfect amp for the modern pedal steel player. If I go ahead with this I will go for 2 X 6SN7 instead of 2 X ECC82 because general opinion is that they sound better and M Jones reckons the distortion is much lower. 4 tube types :-EL84-EL34-6L6-KT88; 2 different circuit topologies :-class A / single ended-class AB / push pull; 2 different modes :-pentode-triode. RATED OUTPUT – 6L6GC (UL ) 8W + 8W (both 8 ohm loaded) – 6L6GC (Pentode) 8. These are less common, and are actually a completely new type having been introduced in or around 1990. hx = Hexode Unit. , I re-installed the 6L6G and, sure enough, I stand by my words. Bandwidth in both modes is claimed to be 15Hz–50kHz. SUBSCRIPTS FOR MULTI-UNIT TUBES: b = Beam Power Unit. PENTODE AMPLIFIER , FIRST TIME IN REGION , ON TRIANGLE SPEAKERS @ STEREO PASSION INTERNATIONAL. The use of a pentode or tetrode allows designer to achieve higher output, but with worse linearity of the gain, while the triode gives lower power, but better linearity. The KT series of tubes was developed by MO-Valve aka Genalex in response to Mullard’s development of the pentode. Working from the graph on the KT88 datasheet page 6, I'd choose a lowest anode voltage of 75V, since this is just on the knee. What type of valve is a KT88? The KT88 is a Beam power valve with an anode/plate dissipation [originally] of around 35 watts, it is sometimes referred to as a pentode by some people, but in fact the clue is in the title "KT" which stands for "kink-less tetrode" The main feature differences in the Kink-less Tetrode compared to the Pentode [and early Tetrode's] was the use of two. When I mean warm I mean more organic in sound, rounded sound, soft bass and soft treble not stabbing treble or high pitched treble but warm is a more rounded sound rather than an aggressive sound. And there you have it. (C) Final stage amplifier; the pentode portion of the 6BM8. 678-4105 12AU7 ECC82 Double Triode, B9A base. 0 mA/V allied to a maximal anode dissipation level of 25W with a sub 1. as a pentode, by removing R12, and inserting R13 and Cx for the screen supply (shown dotted in the schematic). 1 pair for Russian Tissot 6SN7/6N8P/6H8C/CV181 precision paired tube. This calculator allows you to compute and tune loadline and operating point of tube amplifiers' power stages. This tube became the heart and soul of such classics as the Dynaco Mark III, McIntosh MC275, and Marshall Major. So with 550V supply we need (550-300)/0. If the STC still is low in power, please disconnect the line from the anode of the 12AX7 to the anode of the KT88, and connect the anode of the 12AX7 to B+; i. The chassis is black powder coated aluminium as is the transformer cover. These valves saw incorporation into many classic guitar valve amplifiers and. The phase splitter stage (V2) uses a pentode-triode instead of a double-triode. the cathode and one of the grids are shorted. The Challenger can be used with EL-34s, 6550s, or KT88s, and it produces a powerful 115 to 180 watts per channel. It is 300V in Figure 5 (pentode mode) and 450V in Figure 7 (ultra-linear (UL) mode). The design allows for triode, ultralinear and pentode arrangement: triode is so much nicer to listen to, I've never reverted. Heater Uf-----6. 5: 1 (3K7 to 8 Ohms) with 45% taps. 1 pair for Russian Tissot 6SN7/6N8P/6H8C/CV181 precision paired tube. It is more than adequate for this task. the original MO Valve Genalex datasheet calls the KT88 a beam tetrode. The JJ Electronic 6L6GC is the classic pentode built with the rugged construction that only JJ could deliver. 700 Mariposa Street, Denver Colorado 80204 USA | Tel: +1 (303) 534-5170. hp = Heptode Unit. 2 X 12AU7, 2 X 6L6GC (can also use 6CA7, EL34, KT66, KT77, KT88, 6550) Output Modes: Ultra-linear, Pentode or Triode mode ; 6L6GC (Ultra Linear) 8W + 8W (8 ohms). This KT88 offers a lively and dynamic tone that is ideal in both HiFi audio amplifiers and high wattage guitar / bass amps. Very powerful, with strong bass and very bright highs. This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. Pentode sections connected as triodes in push-pull operation 100% class A triode(d) push-pull operation About 1W/channel Po into 8 Ohms Due to internal dummy load, it can drive headphones from <32 Ohms up to whatever impedance Also can drive small bookshelfs Automatic disconnect of speakers on headphone plug insertion. 4 tube types :-EL84-EL34-6L6-KT88; 2 different circuit topologies :-class A / single ended-class AB / push pull; 2 different modes :-pentode-triode. The New Sensor Genalex datasheet calls the same tube a beam pentode. I designed a driver PCB using two 6SN7's that can drive just most tubes, triode or pentode. This was followed by the Mark III which offered 4, 8, and 16 ohm taps and the KT88 beam power tube for a mere $10 more. Detailed Description: (measurement in mm) EL84-T is high transconductance pentode, used as class A1, AB1 and B in audio amplifier. 7 mA/V (spec=0. In 1957 Marconi-Osram Valve Co. Articles by Vincent Teoh on Muck Rack. a high supply voltage of 450V (at maximum power output), and a quiescent current of 45mA per EL34 pentode tube. Switchable between pentode and triode mode Fully Auto-Biasing – Intelligent Auto-Bias KT88 power output tubes Ideal also for more difficult loudspeaker loads. Built specifically for the German post, these are special quality - 10,000 hour pentodes for use in AF and RF circuits. Buy EL34 pentode valve matched pair EL34 MATCHED PAIR or other Pentode Valves online from RS for next day delivery matched quad set 678-4123 KT88-98 KT88 Beam. The tetrode or pentode, when operated normally, is a "stiffer" resistance with regard to anode-cathode voltage. A beam tetrode family widely used in the US comprised the 25L6 , 35L6, and 50L6, and their miniature versions the 50B5 and 50C5. In Pentode mode, the power output is 45 watts per channel. Sunn 200S, has 1x ECC83, on “weird” triode/pentode (6AN8) and 2x KT88’s in the powersection. That means that is has ‘just’ four elements. You can: choose among most common power vacuum tubes (I am slowly adding more), set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode,; set Single-Ended or Push-Pull configuration ; set the Power Supply V+ voltage, the screen voltage. Run the amp with a pair of KT88s or 6550s in pentode mode. Call for brand availability. EL34, EL84, 6L6 or KT88 — simply choose the tube that will color your sound. hx = Hexode Unit. Ships with JJ 6L6GC and JJ 12AU7/ECC82 power tubes, but also accepts KT88, KT90, KT66, EL34, etc; Organic cathode bypass capacitors; Film coupling capacitors; Circuit automatically adjusts bias for the optimal operation of each tube; 3 amplification modes can be selected using PCB jumpers: Ultra linear (8W + 8W) Triode (4W + 4W) Pentode (8. It can also be used in 6550 amplifiers. 807, 5881, el34, 6146b, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. 2020-2-5 - Explore 沈饒光's board "EL84 PP" on Pinterest. important: KT90 can not replace for KT88 and 6550. Less powerful KT88 or 6550 types should be operated at Power Low. MATCHED PAIR. If the STC still is low in power, please disconnect the line from the anode of the 12AX7 to the anode of the KT88, and connect the anode of the 12AX7 to B+; i. A robustly built stereo Single-Ended amplifier utilizing the KT88 Pentode in either Triode or Ultra-Linear mode producing up to 18 watts per channel. hp = Heptode Unit. 3V Indirectly Heated Electron Tube, Find details and Price about China Electron Tube, Audio Amplifier Tube from Kt88-T Beam Pentode 6. Buy RS PRO Pentode Thermionic Valve, Octal Base, 25W, 6. – EL34 has unmatched musicality when compared with KT88 tubes, which offer more bass but lack of the sweetness of an EL34 sound. 50 Watt, KT88-based Monoblock Power Amplifiers These are a pair of hand built, point-to-point wired, Class AB1 pentode power amplifiers. KT88 Mono Block: Triode connected KT88s make BIG sound, excellent for electrostatics. Flippin' Sweet!! Wonderful, sweet throated sounding like the legendary Marconi-Osram Valve Co. Pentode tubes were first used in consumer-type radio receivers. A typical triode audio power amplifier will have a driver that provides voltage gain, coupled to a triode (like 2A3 and 300B) or a pentode or kinkless tetrode such as EL34 or KT88 connected as a triode, connected to the loudspeaker through an audio transformer in a common cathode arrangement. The quick answer to the difference between EL34 vs 6CA7 or EL34 vs KT77 is simple. Neumann used the 13CW4 triode nuvistor in the famous U47 and U48 mics for a while when the Telefunken VF14 pentode wasn't available anymore. KT88 is a beam output pentode with an octal base and power of 42W. KT88/ 6550 / KT90 / KT100 / KT120 / KT150 (Pair / Block) – Direct Plug & Play* 60 Watts (Total Harmonic Distortion: Less than 1% at Rated Output) 65W @ 2% , 68W Max Output Push Pull Class AB1 Pentode Fixed Bias Hum & Noise (A-Weight): BETTER THAN 100 DB!. Unit of Measure : MP. KT88 Mono Block: Triode connected KT88s make BIG sound, excellent for electrostatics. This calculator allows you to compute and tune loadline and operating point of tube amplifiers' power stages. set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode, set Single-Ended or Push-Pull configuration ; set the Power Supply V+ voltage, the screen voltage, the screen tap, the quiescent bias current. Kt88 Big Power Single-ended Hifi Audio Class A Tube Amplifier Excellent Bass Features Output transformerJapan Z11 035 8640 Power transformer10560 Rated output power 240W Ref Poland Franz pokemon circuit Preamp use dual triode connect pentode HiFi materials and chassis Packing include 1pc tube amplifier 1pc Power line075mm Input voltage110V220V240V Basic technical parameters Tubes 1 x SHUGUANG 5Z3PAT rectifier tube 2 x 12AX7 preamp tubes 2 x PSVANE KT88 power tubes Output power 13W 2 ultra. 6CA7/EL34B Tube, Power Amplifier Pentode, China. 7 mA U g1 = -15 V S = 11,5 mA/V R i = 12 kΩ µ-g1-g2 = 8 Triode Connected U a, g2 = 250 V I a+g2 = 147 mA U g1 = -15 V S = 12 mA/V R i = 670 Ω µ = 8 Red/Blue versions available max 125,0 max 52,0 max 110,0. The amp develops a minimum of 60 watts in pentode and 30 watts in triode. The KT88 is a Beam power valve with an anode/plate dissipation [originally] of around 35 watts, it is sometimes referred to as a pentode by some people, but in fact the clue is in the title “KT” which stands for “kink-less tetrode” The main feature differences in the Kink-less Tetrode compared to the Pentode [and early Tetrode’s] was. EL34JJ Red Label Röhre Pentode. important: KT90 can not replace for KT88 and 6550. It offered the benefits of reliability and a relatively high power output. beam pentode Base: OCTAL Uf = 6,3 V If = 1,6 a Typical Characteristics: U a = 250 V U g2 = 250 V I a = 140 ma I g2 = max. By simply changing the power mode, 6V6, 6L6/EL34 and most of the KT series tubes can be used. Andre kilder foretrak navne såsom "beam power amplifier" eller "beam power tube",. Matched pair and quad sets are available for the EL34 and KT88 types. This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. Matched Pair Psvane KT88-T Ⅱ Mark ⅡVacuum Tube Treasure Tube Premium Grade New. High power output tube KT120(Super KT88) 100W/ch(1KHz) at Pentode circuit (70W/ch at Triode). The first section of the table lists 4 digit and European types sorted in numerical and alphabetical order with USA type designations in the second column. -6550’s and KT88’s are more or less interchangeable. Current production EL34 tubes closely resemble Mullard pentode design. pentode feed the second pentode and the notorious paraphase method to make balanced Vac output Vac is effectively an application of 6dB positive FB, so the THD of the two input tubes is doubled, and they both have to make up to 40Vrms for each KT88 grid. It was SUPPOSED to be bad. Dome-type bulb of glass, copper ceramic base with eight golden pins, oxide coated cathode of indirect heated, Carbon Plate. The board contains all the components, EXCEPT the three tubes. This is probably why the EL34 stands out from the group. The KT88 mav be used in pairs in either triode, pentode or ultra-linear push-pull circuits and this Supplement gives circuits and operating data for amplifiers giving outputs of 30 to 400 v,ratts in various conditions of operation. This tube became the heart and soul of such classics as the Dynaco Mark III, McIntosh MC275, and Marshall Major. The output power is around 3Wrms with 6L6 and 8Wrms with KT-88. Es denomina pèntode a la vàlvula termoiònica formada per cinc elèctrodes. The change to a pentode-triode was a development by Arthur Bailey and has a dramatic effect on the open loop gain of the amplifier. I designed a driver PCB using two 6SN7's that can drive just most tubes, triode or pentode. Unit of Measure : MP. This amp was designed mostly to work with KT88, 6L6, or EL34 tubes in either triode or ultralinear mode. 50 Watt Per Channel EL34 Ultra Linear Amplifier. 7 ma U g1 = -15 V S = 11,5 ma/V R i = 12 kΩ µ-g1-g2 = 8 Triode Connected U a, g2 = 250 V I a+g2 = 147 ma U g1 = -15 V S = 12 ma/V R i = 670 Ω µ = 8 Red/Blue versions available max 125,0 max 52,0 max 110,0. While the latter could be inserted in the socket and used without problems, the output power would be lower, and the sound inferior, due to a lower current draw in the same circuit. Classifieds: FOR SALE - Spectacular KT88 Triode/Pentode power amplifier North Audio Stage Master 25 asking for $12800. Kt150 Set Amp. This is actually the same circuit you will find in the Marshall 2550 and 2555 Silver Jubilee amps labeled as high and low power. Using a KT88 in Pentode mode has a plate resistance of perhaps 12k Ohms. A pair of these 6550 KT88 Matched Pair beam pentodes in push pull can easily provide 100 watts of audio power and they come with a test certificate showing the supermatching parameters. KT88 Mono Block: Triode connected KT88s make BIG sound, excellent for electrostatics. Current production EL34 tubes closely resemble Mullard pentode design. If you require matched pairs or quads, simply order 2 or 4 off. It is more than adequate for this task. Elekit TU-8200 Main Specifications. KT88 is a beam output pentode with an octal base and power of 42W. The TU-8800 is a single-ended power amp kit that supports many popular octal-base pentode and beam power tubes. Can replace KT88s or 6550s. Buy RS PRO Pentode Thermionic Valve, Octal Base, 23W, 6. It can also be used in 6550 amplifiers. Electrically, they are the same. 2/ The KT88 was historically developed in Europe as an 6L6 update but never became a clear replacement as it is richer and fuller in harmonics, more potent of drive and can handle some tougher speakers. made by the UK to counter the high-powered US 6550. 5w single-ended triode (SET) tube amp, a pair of 30w push-pull tube amps, a 50w mid-1970s solid state amp, and a 150w Class-D amp. diodes 6x2p / ЕАА91 / 6В32, 6x2p-ev 6x6s / 6h6gt 6d14p / 6b3 / ey81 6d20p / 6al3 / 6v3a 6d22s / ey500 6s10p / ey83 6s17s / 6u8 / 4gt(a) 6s19p. Ships with JJ 6L6GC and JJ 12AU7/ECC82 power tubes, but also accepts KT88, KT90, KT66, EL34, etc; Organic cathode bypass capacitors; Film coupling capacitors; Circuit automatically adjusts bias for the optimal operation of each tube; 3 amplification modes can be selected using PCB jumpers: Ultra linear (8W + 8W) Triode (4W + 4W) Pentode (8. 0 mA/V allied to a maximal anode dissipation level of 25W with a sub 1. The KT88 is a kinkless tetrode, i. The 6P14P-EV is a direct equivalent to the 7189. The Spirit uses four KT88 (aka 6550) and three 12AU7 tubes. Kt150 Set Amp. Tellegen in 1926. Category: EL34-6L6GC-6550C-KT88-KT120-KT150-5U4G-GZ34-6 € 2,00 / pcs includes VAT / shipping costs extra. It may be used with triode, pentode, or ultralinear (screen tap connection) wired tube arrangements. KT88/6550 TJ FullMusic Classification- It is a beam pentode. If you look at the phase plot, you can see it crosses 180 degrees at about 200kHz (and again around 400kHz). 6L6GC (Pentode) 8. 35 : 9CE : Power Pentode = Audio Amplifier: Beam Power Pentode = RF. 2 W 6L6GC (Triode): 4W + 4W: RESIDUAL NOISE 6L6GC (Ultralinear): 90μV (IEC-A) RATED INPUT 6L6GC (UL mode): 230 mV: FREQUENCY RESPONSE 12 Hz - 70 kHz (-3 dB) INPUT TERMINALS LINE x 2 (LINE 1, LINE 2. Brand: JJ ElectronicsModel: KT88Type: Power TubeIncluded: Matched Pair. Triode/pentode kit as used on the VTA ST-70 pictured above. Simply remove the old bias pots and install the switches in the empty 3/8" holes. The output power is around 3Wrms with 6L6 and 8Wrms with KT-88. If you'd like a power reduction, but want a response with more bite and attitude, then go for the pentode. kt88: beam pentode 6v 3v indirectily heated : beam-power pentode primarily designed for use as the horizontal-deflection amplifier in television receivers. Find many great new & used options and get the best deals for 5 TYPE43 AUDIO OUTPUT PENTODE, VALVES, HEATERS OK at the best online prices at eBay! Free shipping for many products!. AKG used a 7586 nuvistor in the C-12A mics and a RCA 7586 nuvistor in the C61 mics. 3 V If-----0. the cathode and one of the grids are shorted. 6 : 7AC T14 : Beam Pentode = Audio Power Amplifier: 71 Get72: 6760-18: 0. A typical triode audio power amplifier will have a driver that provides voltage gain, coupled to a triode (like 2A3 and 300B) or a pentode or kinkless tetrode such as EL34 or KT88 connected as a triode, connected to the loudspeaker through an audio transformer in a common cathode arrangement. The pentode contributed to the electronic preponderance of the Allies. Es denomina pèntode a la vàlvula termoiònica formada per cinc elèctrodes. This is where screen voltage plays a key role. A 6CA7 is a different type of tube than an EL34. The TU-8800 is the culmination of ELEKIT’s best designs and circuitry from their previous amp models. To make things easier to. The Casablanca’s provide 60 watts with KT88/6550 power tubes and 45 watts with EL-34s. Use the BNC cables provided to connect the X, Y and Z outputs to your oscilloscope. StereoTimes� Most Wanted Component Award 2017 for Challenger 115. The upgraded VTA driver board uses three new 12AU7 or 12BH7 triodes in place of the two mediocre sounding 7199 pentode/triode tubes. Using a KT88 in Pentode mode has a plate resistance of perhaps 12k Ohms. 3k screen resistors. To figure out the compensation needed to keep it stable, I did open-loop gain and phase measurements (a Bode plot): The amp without NFB has a gain of around 40dB. Introduction. The pentode contributed to the electronic preponderance of the Allies. Pentode tubes were first used in consumer-type radio receivers. However, it is in combination that the PrimaLuna Evo 300 duo shine. Brand: JJ ElectronicsModel: KT88Type: Power TubeIncluded: Matched Pair. Mullard remained loyal to the Pentode. Rediscovered by Matchless amps and now currently [] AVAILABLE. KT88: pdf Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Anode dissipation rate is 50W, which provides for push-pull amplifiers utilization up to 110W output per pair, with 550V on the anode. d = Diode Unit. GENALEX GOLD LION KT88. You can also use : KT88, 6550C, 6CA7 (EL34) OUTPUT STAGE – Output stage can be configured in a multiple of mode, select from Ultra-linear, Pentode or Triode mode. Audio Output Transformers. Has anyone compared KT88 beam power tubes wired in triode versus pentode configuration? I have to replace the octal sockets in my heavily modified ST-70 and I need to know whether to go triode on the output section. Seems like a grey area. Bias adjustment with a Cathode-direct meter. A KT88 is a beam powered tetrode, whereas a 6CA7 (EL34) is a power pentode. 75" H x 17" W. The KT88 is a kinkless tetrode, i. Power amp presence and depth controls. Since a pentode has a screen grid to contend with, calculating voltage gain with it is slightly different - than with a triode. By simply changing the power mode, 6V6, 6L6/EL34 and most of the KT series tubes can be used. 3V Indirectly Heated a. Has anyone compared KT88 beam power tubes wired in triode versus pentode configuration? I have to replace the octal sockets in my heavily modified ST-70 and I need to know whether to go triode on the output section. Replaces EL84, 6BQ5, EL84M and 7189 valves. Similar to a 6550, a KT88 leans toward having a rich harmonic response with a very defined low end and a tendency toward plenty of clean headroom. Generally compatible with: 6AK5 EF95 6096 6F32V 6J1 403A 731A PM05 CK604A 5654 CV850 GL-5654 M8100 6AK5W types. ) x 115mm or other Double Triode Valves online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. Generation   also used to replace 6U8-A, ECF82, 7687 with slightly…. 4 tube types :-EL84-EL34-6L6-KT88; 2 different circuit topologies :-class A / single ended-class AB / push pull; 2 different modes :-pentode-triode. 37 + AU $250. The KT88-TK is a beam-power tetrode that shares similar applications as the 61. Audio Output Transformers. Very powerful, with strong bass and very bright highs. pentode for audio serice applications oxide coated indirectly heated unipotential cathode any mounting position k,g3 see below bottom view basing diagram jedec 7ac pin 1 - no connection or base shell glass bulb large wafer octal with barriers 7 pin low loss b7-99 the kt120 is a beam pentode power amplifier primarily designed for audio service. Pentode tubes were first used in consumer-type radio receivers. The term most commonly applies to a three-grid amplifying vacuum tube (thermionic valve), which was invented by Gilles Holst and Bernhard D. The new Ayon Spirit is an entry-level, four-input, integrated design that can operate in either Pentode or Triode mode thanks to a small rotary switch that nestles on the amplifier’s top-plate. You can use 6CA7 or KT77 in place of EL34. This is a mono-block design (1 amp per channel). Three levels of negative feedback (High, Low and Off) The ability to accept most common octal based power tubes, such as KT66, KT77, KT88, KT90, KT100, 6550, EL34, 6CA7, 6L6, 5881, 6V6, and 6K6. A beam power pentode with 50W anode dissipation. Musical Fidelity used 6CW4 nuvistors in their Nu-Vista 300 amplifiers and their Nu-Vista 3D CD players. You can: choose among most common power vacuum tubes (I am slowly adding more), set the operation modality, among ultralinear, pentode, and triode (suppressor tied to cathode) mode,; set Single-Ended or Push-Pull configuration ; set the Power Supply V+ voltage, the screen voltage. The resulting sound character of this DAC is a whole level better than obtainable from any noval or octal tube, forget Ecc88, ECC82, 6SN7 or the like. The KT90 is a beam-power pentode primarily designed for use in audio frequency power amplifier applications. Triode/pentode switching kit This kit may be added to any amp driven with the VTA mod PCB to allow your amp to operate in either the normal pentode ultralinear mode, or switch to sweet sounding triode mode. How to? (6. Rogers's president and chief designer, Roger Gibboni, has obviously gone to extreme lengths to create a unique-looking. The pink line is the temporary Class A plate load line which runs from 340 volts to 85ma. KT90 and types and brands exist, and what you can do with the this tube. A pair of these 6550 KT88 Matched Pair beam pentodes in push pull can easily provide 100 watts of audio power and they come with a test certificate showing the supermatching parameters. 5mm stereo mini jack (Common with LINE2, but has a priority to LINE2) Output terminal: Speaker output terminal. 2 x 25 W met EL34 in pentode en. Reason is that rectifier tubes schematics are so easy, but choosing the right values EXCHANGING TUBES LIKE EL34, KT88, etc in PUSH PULL AMPLIFIERS The issue is, the Parallel Single Ended output Tubes are hard wired in parallel. The top honours went to MOV for their KT range, especially the KT66 and later the KT88. KT88/6550 TJ FullMusic Classification- It is a beam pentode. This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. By simply changing the power mode, 6V6, 6L6/EL34 and most of the KT series tubes can be used. and became quick competition for the USA made 6550 tube. Likewise, current production 6CA7 are beam-forming tetrode like the original Sylvania design. Most common low power pentode, popularized in early Vox AC30 amps. 2/ The KT88 was historically developed in Europe as an 6L6 update but never became a clear replacement as it is richer and fuller in harmonics, more potent of drive and can handle some tougher speakers. The amplifier stage is based on the Compact Hi-Fi Power Amplifier by Melvin Leibowitz. Va ser inventat pels neerlandesos Gilles Holst i Bernardus Dominicus Hubertus Tellegen, de l'empresa Philips el 1926. EL34 page sheet date 1 1 1969. The KT88-TK is a beam-power tetrode that shares similar applications as the 6L6 and EL34, and is one of the largest tubes in its class. UTRA - LINEAR CONNECTION - Vg1=OV -lov TAPS la(mA) 6550 Vg2=kon. This tube produces a superior soundscape at a great price. Near equivalent of 6BQ5 / EL86 / EL84. This is where screen voltage plays a key role. KT88 is a beam output pentode with an octal base and power of 42W. Since a pentode has very high plate resistance, the driver's output impedance is dominated by the plate load resistance, which needs to be low enough to provide plenty of drive to the KT88 control grid. pentode feed the second pentode and the notorious paraphase method to make balanced Vac output Vac is effectively an application of 6dB positive FB, so the THD of the two input tubes is doubled, and they both have to make up to 40Vrms for each KT88 grid. In spite of being called a tetrode, it has three grids like a pentode. A pentode CF will typically, for instance, use a lot of gain to lower an already very high internal impedance, to arrive back at a low signal Z out (which feels like a lot of hard work to me!). And re-issued KT77 deliver the legendary magical sonics of the original. Likewise, current production 6CA7 are beam-forming tetrode like the original Sylvania design. hp = Heptode Unit. 35 : 9CE : Power Pentode = Audio Amplifier: Beam Power Pentode = RF. This pentode based KT88 stereo amp uses a small amount of feedback in the design. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. 00 calls only Vintage Power Amplifier, Crown Early DC300 Stereo Amplifier (Northridge) $350. The use of a pentode or tetrode allows designer to achieve higher output, but with worse linearity of the gain, while the triode gives lower power, but better linearity. I used a variable power supply, adjustable bias, and several different output transformers with 6L6's, EL-34's, KT-88's, 6550's and a few others. Very powerful, with strong bass and very bright highs. it features gold-plated grid, tri-plate anode and a single piece beam electrode. The B+ is 425V, KT88 bias is 40mA and o/p transformer turns ratio is 21. Sunn 200S, has 1x ECC83, on “weird” triode/pentode (6AN8) and 2x KT88’s in the powersection. Pentode Amplifier. Pentode tubes were first used in consumer-type radio receivers. my amp is a Ekco amp that uses KT88 tubes and my speakers are Focal 926 and the speakers are new under 2 weeks old. The design allows for triode, ultralinear and pentode arrangement: triode is so much nicer to listen to, I've never reverted. Typically high power single-ended amplifiers are either run in pentode or using exotic power tubes; we opted for a push-pull based amplifier; the larger version of the Stereo 15. Free shipping. A pair of these 6550 KT88 Matched Pair beam pentodes in push pull can easily provide 100 watts of audio power and they come with a test certificate showing the supermatching parameters. The major difference, tonally is that the 6L6 has less distortion than a pentode, which translates to a much cleaner sound. 3V Indirectly Heated a. The tube will idle at 340 plate-to-cathode volts and 32ma. Pentode tubes were first used in consumer-type radio receivers. Ayon Spirit III KT88 Integrated Amplifier $3,899 Whatsapp / Call (65) 8606 1134 Joseph Amplifier: Ayon Spirit III Class of Operation: Triode* or Pentode mode, Class-A* Tube Complement: 4 x KT88 Load Impedance: 4 & 8 Ohms Bandwidth: 12Hz - 60kHz Output Power-Pentode mode KT88: 2 x 50 W Output Power-Triode mode KT88: 2 x 30 W. 05% residual THD) and a Velleman PCSU1000 (PC interface) oscilloscope. ) will change optimum plate to plate load impedance. Pentode Connection 250 250 -14 140 12 11. made by the UK to counter the high-powered US 6550. The TU-8800 is the culmination of ELEKIT's best designs and circuitry from their previous amp models. KT88 is a beam output pentode with an octal base and power of 42W. Amplifier Electron Tube, Find details and Price about China Electron Tube, Audio Amplifier Tube from High Quality Beam Pentode 6. Recommended by Alan Kimmel as a top tube in a mu-stage. If I go ahead with this I will go for 2 X 6SN7 instead of 2 X ECC82 because general opinion is that they sound better and M Jones reckons the distortion is much lower. 35 86 * 40 Power transformer: 105 * 60, 240W Ref Poland Franz pokemon circuit Preamp use dual triode connect pentode, KT88 tube filament midpoint adjustment HiFi materials and chassis. "Over designed" for high fidelity, single ended, Class-A, tube output circuits (triode, tetrode or pentode tubes). 20LF6, Beam Power Tube, Pentode, Sweep. 678-4114 12AX7. power output tubes for audio, guitar amps, radio 572b and 811a tubes in stock! open this section for all popular power output tubes for audio, guitar amps and general amplifer service. China Tube Amplifier wholesale - Select 2020 high quality Tube Amplifier products in best price from certified Chinese Tube manufacturers, China Amplifier suppliers, wholesalers and factory on Made-in-China. To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. Beware, this is the opposite of almost every other Guitar World guitar amp review! As a DIY musician who plays trash blues, I could give a rat’s heiney about the fine minutiae of frequencies and tube bias. Other popular beam power tubes include the 6V6, the 6550, the 6BQ5/EL84, the KT66, the KT88, and the KT90. The TII series EL84 remain the same as the T-series except the packaging changes. The TU-8800 is the culmination of ELEKIT's best designs and circuitry from their previous amp models. The 65V-1 integrated amplifier ($4000) uses EL34 or KT88 pentode tubes—at the time of purchase, the user specifies his or her preference—and is made by mainstream manufacturer Rogers High Fidelity, in Warwick, New York. The 6V6 is a lower-voltage, lower-power (350-V, 14-W) beam power tube (see Photo 3). Pentode simulator. The old stock 30, 20, 20, 20 electrolytic quad cap which had marginal storage capacity for this amp has been replaced by a 80, 40, 30, 20 quad cap for almost double the power storage capacity. Ah - the legendary EL34 pentode which has been the heart and soul for classic guitar rigs and my first ever tube amplifier, the Dynaco 70. A KT88 is a beam powered tetrode, whereas a 6CA7 (EL34) is a power pentode. A beam tetrode, sometimes called a "beam power tube", is a type of tetrode vacuum tube (or 'valve') with auxiliary beam-focusing plates designed to augment power-handling capability and help reduce unwanted emission effects. BEAM PENTODE KT88 is a beam output pentode with an octal base and power of 42W. but plate size is slightly big than KT88's and disspation power has 50W. The ubiquitous Mullard EL34 (6CA7), although manufactured by Mullard as a pentode, was also produced by other manufacturers as a beam tetrode instead. KT88 is a beam output pentode with an octal base and power of 42W. Highly modified amp. The KT88 Gold label offers Marshall official replacement tubes for Marshall amplifiers with KT88 power amplifiers, such as the JCM800 2203 Kerry King Signature. diodes 6x2p / ЕАА91 / 6В32, 6x2p-ev 6x6s / 6h6gt 6d14p / 6b3 / ey81 6d20p / 6al3 / 6v3a 6d22s / ey500 6s10p / ey83 6s17s / 6u8 / 4gt(a) 6s19p. If a valve amp were to be designed now, the only sensible output valve choice for an amp providing a useful output power would have to be the KT88/ 6550 or preferably, the KT90. The whole M100 series line has been built around this concept. 20LF6, Beam Power Tube, Pentode, Sweep. Each tube is protected by a fuse and is self-biasing even when tubes are replaced, no adjustments are necessary (but the tubes have to be paired). (2) 12J5GT Tung-Sol, NOS/NIB, 60s vintage grey plates, $7. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. That corresponds to an Ig2 of 75mA peak at 300Vg2. The KT88-TK is a beam-power tetrode that shares similar applications as the 61. Shop Vacuum Tubes by Brand, Class, Model, Package, Replacement Type, Price, Ratings & Reviews & more. The TU-8800 is the culmination of ELEKIT's best designs and circuitry from their previous amp models. The compact TRV-88SER integrated amplifier features KT88 valves (Triode branded) as the model number suggests, operating in class AB mode and ‘push-pull’ operation. but plate size is slightly big than KT88's and disspation power has 50W. scale prices. The TELEFUNKEN Elektroakustik KT88-TK is a newly manufactured and cryogenically treated version of the legendary KT88. The RH88 was initially conceived as a 6550 or KT88 amplifier, and later some DIY-ers asked for a customization to use 8417. The tube, built according to the design of the jet pentode, is especially known for its responsive and dynamic sound behaviour. Classifieds: FOR SALE - Spectacular KT88 Triode/Pentode power amplifier North Audio Stage Master 25 asking for $12800. The following guidelines should be taken into account: The free shipping option allows TubeDepot to choose the most appropriate carrier and service. All this adds up to greater efficiency and lower distortion than a regular tetrode or pentode. Only a very few beam tubes have that option. In 1957 Marconi-Osram Valve Co. A few good used for $4.