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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As I am able to design and wind my own transformers I decided to do the experiments with separate power supplies for now, so I could play around with voltages and try and achieve the desired results; the end idea being to rewind the mains transformers with the voltages I ended up with. Prior to the 6CG7 stage is a simple voltage amplifier using a 6AV6 triode. A lot of fixed bias circuits are usually quite high and are deliberately reduced accordingly.

If you feel uncomfortable with this, simply lift the ground of each pot through a 10k resistor el63 pot or thbe common grounded one of 2. The two types are similar in characteristics but not directly interchangeable. I also tried screen drive, via transformer coupling, and also zero bias mode where you drive the screen and control grid via a 22kOhm ttube resistor at the same time.

Why use an EL36? If you have 45 volts or more then that is fine. The results aren’t really surprising, and after looking at the STC manufacturer data on the 6CD6 when used as a single-ended Class A output stage, it just confirms what I suspected.

In series with your original transformer this will give you the volts DC plate supply on load. This gives an anode dissipation of around 18 Watts per valve.

In many respects the data for this valve indicates general similarity, but clearly the two are not immediately interchangeable. It was so totally different from my EL84 amp, comparing mono to mono. Lots of secondary taps for various impedances, including 70V and V line driving windings. They are getting very rare nowadays, though they turn up now and then on Ebay but the prices are extortionate. 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.


Click on the image to enlarge. The 6CM5-EL36 is a good, low cost choice for an SEPP single-ended push-pull amplifier as it has a low average anode voltage and is capable of passing around mA of anode current. But after quite a bit of experimentation with other output valves I used 6CM5’s, based on the large amount of information now available on these dime-a-dozen valves.

Conventional push-pull EL36 implementations are covered in detail elsewhere, so my comments in this article below are related to using the valve in a single-ended output stage. The final amp topology used the front end of the Leak Stereo 20 amp, as I had heaps of twin-triode valves in the junk box. The input tube is a paralleled 12AT7. So it would be good to hear from some engineers at AWV and Philips to find out more!

Having said all that, the low anode voltage is of interest, as it may permit a valve amplifier to operate on modern low voltage power supplies. You can see links and background for Graham on 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.


A photo of the prototype is shown above for an idea of layout. This is confirmed after repairing many Philips public address amplifiers, in never ever having to replace an output valve. However as the secondary of this only needs to make up the difference of the original power transformer HT up to volts, it actually won’t be quite that big!?

If the 6CM5 should start to draw more current, the voltage across the 50 Ohm cathode resistor will rise, making the 6CG7 control grid more positive. This required yet another re-bias of course, and with a brand new pair of Mullard EL’s biased at 30ma cathode currant per tube, this baby was doing I am most grateful for John’s contribution of time, experience and knowledge as evidenced below.

Designed for Class C tub, this is hardly surprising. A pair in push-pull makes great sound in my guitar amp! I am now ready to re-build all 4 of these amplifiers as and when, and then eventually display them on this website.


The other thing with TV valves, particularly the European ones, is they are good performers with low voltage anode and screen. These tests were done with a regulated valve power supply, a BWD model For someone who grew up in the ‘s, it’s ironic that I learnt about valves before solid state. Note that if you build a stereo version then use a separate filament supply for each output valve and do not ground the supply.

Having started at about the age of 9 and I am now I say ‘probably’ as E36 haven’t done any actual distortion tests but only visual inspection of distortion as seen on the CRO. My answer to this would simply be: I’m tubr for the transformers to try that.

The EF86 pentode, is responsible for high sensitivity but poor noise performance. There was also a variant with 4 x EL36 push-pull parallel with Ra-a of c. Actually I’ve got a car radio project coming up.

6P31S / 6P31C = EL36 = 6CM5 tube. Beam tetrode

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. Furthermore, this is my first experiment with enhanced triode mode.

It’s a Maton Powerpack Studio amp. Next job was to rip out the Magnavol bases and replace with a pair of good old octals. It’s usefulness goes way beyond the mixer oscillator use mentioned in the data books. Wl36 didn’t need them in my prototype as a regulated power supply was being used a BWD with very low output impedance.

I wouldn’t say right away that the EL36 is better than the EL Nevertheless, no matter what else I did they would give no more. Lastly I would imagine a question that most people would ask is: I have done this many times before with other valves with great success; try an and you will never use any other method again.

This has made the filter choke redundant, and many of these have been thrown out.