EL36 / 6CM5 TESLA tube tubes store. TESLA EL36 / 6CM5 high power amp tube. Customers who bought this product also purchased. Class, Va, Vg2, Vg1, Ia, Ig2, Zout, Pout, THD. Line output, , , , B ( idle), , , , 36, 1, B, , , , , 38, 3,, , He offers a 6CM5/EL36 based 2 x 22 Watt Stereo Class AB1 triode amplifier, the fuss was about tube sound, while their solid-state amp’s are being repaired.

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An anode voltage up to V, screen voltage of V, and a relatively low anode to anode load of 3. Russian, Eastern European, and Chinese audio valves mean that we don’t need to make do with old non-audio types unless we want to.

Click on the image to enlarge.


Lots of secondary taps for various impedances, including 70V and V line driving windings. Really nice reverb, 2 x 12 speakers, uses two EL36 output valves, about 40Wcombo style, but not open back – the speakers are fully enclosed.

A while ago I decided to spend some serious time on one of the smaller amps the model with just a pair and see if I could come up with some descent results using cheaper and or more readily available tubes! Negative feedback is provided in the shunt form by the kOhm resistor, with the 0.

Feedback isn’t applied to the 6AV6 as it’s a triode handling low voltage and in my opinion it isn’t necessary. My latest and successful experiments came from the theory that RC coupling was probably not such a clever idea for screen grid drive. The two types are similar in characteristics but not directly interchangeable. That’s a matter of personal preference; in fact I probably won’t include any negative feedback for my first application of this circuit; that tue a car radio for my Model T Ford.

With volts on the screens, and volts on the plates respectively, they performed quite well.


BoxVilnius, LT, Lithuania. Driving via the control grid g1 is not the way to use this valve for Class A audio, as much as I have tried.

A 6AQ5 or 6V6 will give nearly double the output power for less than half the heater current! Puts out about 70W, according to Philips. The photos show the actual quad mod running on completion. Intrigued by the large number of fl36 who are now turning to low power single ended amplifiers for high quality audio reproduction, I discovered there was a definite trend in customers and others asking about SEPP Single Ended Push Pull designs.

As is well understood, they are an odd valve to attempt to apply to audio applications, and I had lots of unsuccessful attempts to use them. There is clearly a getter inside, but it is not flashed as it is of a type that dl36 need to be, and cannot beflashed, but outperforms traditional getters. This was to the best of my knowledge the only Geloso model to use a quad of output tubes.

I also tried thbe drive, via transformer coupling, and also zero bias mode where you drive the screen and control grid via a 22kOhm series resistor at the same time. When using a low supply voltage of Volts the screen can be tied to the anode supply, thus not requiring its own regulated supply voltage.

EL36 / 6CM5 TESLA tube – POWER / OUTPUT tubes –

I wouldn’t say right away that the EL36 is better than the EL Their ratings are usually max volts plate and screen, but with a 7kv peak pulsed plate eo36. You can see links and background for Graham rl36 my main page, in the section relating to the “ETI” amplifier, and get a taste of his current output as a writer by visiting AudioXpress.

It’s a Maton Powerpack Studio amp. Outside Australia the 6CM5 valve is virtually unknown. The “Williamson” type circuit would set the standard in audio amps’ for many years to come.

At very low currents, ra rises. Apart from possibly the HT caps down the line, everything else will be fine. It is equally adaptable for the EL Philips used them in PA amplifiers as well.


This would do some nice things in single-ended configuration I guess, or in push-pull it would be quite efficient for triodes, while requiring a modest drive. This and the required Ohm speaker transformer don’t tend to match in well tubw other valve circuitry and parts availability i. Triode Mode Although a plot of EL36 curves in triode mode appeared reasonably linear, the EL36 was found to perform relatively poorly in a simple single-ended triode-strapped configuration, exhibiting very obviously poor linearity.

The 6AV6 is really half a 12AX7, but just about anything could be used for this stage. Note that if you build a stereo version then use a separate filament supply for each output valve and do not ground the supply. I’ve built numerous other AM and FM radios using only TV valves rather than comparatively rare and expensive GT and G style radio valves, which I’d rather keep for equipment made in that era.

Lastly I would imagine a question that most people tubw ask is: This makes the valve stable under all kinds of loads, and even with output transformers with large leakage inductance. Note that far more practical and realistic is application in Class AB, rather than Class B, where about one third of these power levels can be expected.

In each channel, the 6CM5 TV line output output valves are connected as triodes and are driven by a long-tail pair using a 6CG7. This too is better than the original quad of EL’s which managed watts tops at best! With tubbe road and engine noise in an open car, Hi-Fi is scarcely worth trying to attain! I believe negative feedback gives the amplifier a substantially flatter frequency response, than otherwise would be. They don’t look bad at all!

There are points to note regarding construction.