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What means the letters PL 
The Sovtek KT66 has a different construction from the vintage KT66 as made by G.E.C. The Sovteks are related to the American 6L6. The Sovtek tube has a fully machine made glass construction, The Chinese and G.E.C. tubes have a handmade glass construction. The Sovtek low-resonance glass shape gives this tube a unique appearance. |
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What means the letters PL
The Sovtek KT88 was designed to offer the highest output power and the most reliable, linear performance available in a KT88. The unique tri-alloy plate structure of the Sovtek KT88 yields higher minimum plate current and higher Transconductance while improving heat dissipation and reducing tube warm-up time. Its triple-carbonate Oxide Cathode allows the Sovtek KT88 to operate at full power for extended time periods without failure. These improved characteristics offer increased power output, higher amplification factors, and more precise tube matching with minimal drift while still maintaining tonal clarity. The Sovtek low-resonance glass shape gives this tube a unique appearance. Click here for a detailed image. |
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5AR4 |
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5U4G This rectifier is a special baby. First, it is one of the ONLY Coke bottle glass 5U4G that you can buy from New Old Stock. So yes, this tube is not new production. Actually the Russian military had tons of this tube made, but with another tube base on it. The generic tube is the sane as 5U4G
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6C33 These are re-branded Uyjanov tubes. So we at JAC-Music do not sell this tube, but recommend the Uyjanov directly. Check under NOS tubes. |
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6C45pi Another great tube from the Russian military, at it's highest point of development. This is a frame grid tube, meaning the grid wires are so extreme thing, you can not see them with the eye or handle them with machines. For making a grid like this, first a frame is made of hard metal. Around this frame, the gird id wound, and frame and grid together go inside the tube. Like this very precise tubes of high gain can be constructed. This one has a gain of 50x and... it had enough plate dissipation to build a small SE output stage with it. Realistically, it is not made for SE stages, but it has been done. This tube is ideal for used with Lundahl LL1660 driver transformers. You can the transformer for instance in a 4.5 : 1 step down scheme. This will still leave you with a total gain of 50/4.5= 11x which is a good number. The good part is now, the output impedance of this tube is reduced with a factor (4.5)² = 20. So the original Ri of the tube, of appr. 1100 Ohms will appear as 55 Ohms (!) at the output of the LL1660. So a line output stage with this tube, using the LL1660/25 would have these specifications: Design example for line output stage:
Note: For Line Output stages, the "S" Version, LL1660S/25 gives superior noise isolation, but the normal LL1660/25 works very good also. |
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6H30pi This tube is probably the last great double triode the Russians made. For a long time is was forbidden by the military to sell NOS stock of this tube. They had blocked all stock, and kept it "secret". About 9 years ago, stocks were released bit by bit. Indeed this tube is really magic in performance. You need to read the datasheet (at the "Techcorner" from this website menu!). Then you will understand why the military wanted to keep this for themselves. This tubes has all you expect, and all good things combined. So you have quite high dissipation, high gain, amazingly low plate impedance, as low as you get normally with a 2A3 or so. This incredible low plate impedance was NEVER presented before in a miniature, NOVAL based tube. And it never was made later on, by any manufacturer. Only THIS tube had that. The plates of this tube are not by thin "plate". They are solid block nickel, that is where the amazing electrical properties come from. This tubes is a miniature tank, and yet with beautiful HiFi data. And then you get two of those rubies in one bulb. Note they have made the glass extra long because of the huge getter. That will give extra long life. What else do you want? Gold pins may be... But that exists also, then you take the EHX Version, the EHX is available also balanced, meaning both triodes are identical. |
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What means the letters PL
The Sovtek 5881 delivers a warm, round tone that "sweetens" any vintage or modern guitar amp design. Chances are if an amp uses 6L6-style output tubes, it has Sovtek 5881's in its sockets. Built to rigid military standards, the 5881 will tolerate higher voltages than any other 6L6. In fact, they're frequently used as replacements for the old 7027 model in vintage Ampegs. Extremely consistent from piece to piece, The Sovtek 5881 is the most reliable current production 6L6 available. Used by Marshall, Soldano, Solo, and others. The Sovtek 5881 has a heater voltage of 6.3 volts at 0.88 amperes. Maximum plate voltage is 250 volts while maximum plate current is 73 mA. The 5881 has a Transconductance rating of 6000 micromhos and a maximum output power of 5.8 watts. |
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6SL7-GT 6SN7-GT
These are NOS tubes, remarketed by Sovtek. They feature the GT option, which means higher power per system. They do not have the GT-A or GT-B option, which is a quick-start option for American color TV's. Sorry, but the Russians made them for instrumentation purposes. The old fashioned slow start is better for the tubes anyway! The have the older, inner glass construction as can be seen with 300B. This part is hand made. They do not have the modern, machine made glass construction as for instance seen with the EL34 and most of the GTA or GTB's. |
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12AX7WA / 7025 The Sovtek 12AX7WA is said to be from Russian Military stock. This is probably the only tube of this kind that is available just normally. It has is a beautiful black boxed plates. Construction and mechanical quality are absolutely outstanding, so this is the tube of choice by several Japanese amplifier companies at the moment. |
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12AX7-LP The Sovtek 12AX7-LP is a tube from new production. It features the very long ribbed plates, much simular to the famous and very rare NOS TESLA ECC803S. |
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12AX7-LPS The Sovtek 12AX7-LPS is the same as 12AX-LP, only the LPS features a spiral heater filament. This makes is very suited for luw hum appliciations. |
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7027
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What means the letters PL
The Sovtek EL34WXT features a unique grid block construction which allows it to operate at higher Transconductance and power ratings than any other EL34. In comparison tests with other brands, the Sovtek EL34WXT was found to have as much as 6% higher output at the same nonlinear distortion level. These specifications allow for a more consistent, longer lasting vacuum tube. Most importantly, the Sovtek EL34WXT is guaranteed by the manufacturer to be the richest sounding, most dynamically sensitive EL34 ever produced. |
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The Sovtek EL84 is "the" tube when you are looking for a plain strong EL84 at reasonable cost |
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What means the letters PL
Factory matched version of EL84 |
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EL84M-PL This is a specialty. As you perhap know, Sovtek tubes can be new production or rebranded NOS Russian military tubes. This seems to be the case with the "M" version here. There used to be a so called "EB" version, originally from Russia, which is longer life and tighter specified. These are fully impossible to get now. However under the Sovtek brand these are still available, and are called "M" version. |
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Can be seen as small version of OC3. The difference is that OB2 is made as a reference. A reference tube will give amazing voltage stability when you use it at a given current. So this is the "use" current for this tube, when you use it as a reference. Get the right value from the datasheet, but it is around 10mA. Note that a reference tube will outdo a Zener diode by far! Zenerdiodes have a very big problem, and that is temperate dependence, higher noise, and not so ideal reliability for the high voltage versions. So even today a gas reference tube is the best you can buy. Click here for a compare between a Solid State 120V Zenerdiodes, and the "old" equivalent OC3. Nice article about gas reference tubes |
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