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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Grounded-grid mode with constant-current drive. Ratings for use in Class B push-pull are readily available from Philips datasheets available on the internet.

They were of unusual construction and very compact. With the road and engine noise in an open car, Hi-Fi is scarcely worth trying to attain! Ratings are similar; same top cap and pin out. The pale coloured aluminium central box is a channel with solid-state components for regulating the anode supply instead of using a choke.

One final point here: I say ‘probably’ as I haven’t done any actual distortion tests but only visual inspection of distortion as seen on the CRO. Lots of power at low anode voltages. Having started at about the age of 9 and I am now Only the DC biassing cathode resistor is decoupled for audio variations by a 22uF electrolytic cap’.

The anode voltage should be V when the 6CM5 anode is drawing 45mA. Click here to read Grant’s most informative article! 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. It only gave out 7W! This left the field wide open for trying a multitude of output tubes.

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

Also, the very simple independent screen supply can be clearly seen. They are always sad to have to return it when their solid state amp is fixed.

In this configuration with low Volts and low impedance anode loads you are fighting the dynamic internal anode resistance of the valve, making it almost impossible to match an anode load with reasonable output power and efficiency.


The input tube is a paralleled 12AT7. Prior to the 6CG7 stage is a simple voltage amplifier using a 6AV6 triode.

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

My answer to this would simply be: A pair in push-pull makes great sound in my guitar amp! Geloso did in fact do 2 models and matching slaves using the EL output tubes. This required yet tub 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 The down side again is low output power in the order of 3 Watts RMS.

I couldn’t really get good linearity with decent output power. You will be working with potentially lethal voltages! Regardless, the circuit in Figure 1 yields a nice, tubee quality, low cost let’s make that ” really, really cheap “amplifier.

They are getting very rare nowadays, though they turn up now and then on Ebay but the prices are extortionate. For ordinary control grid drive it’s fine as the grid is of infinite impedance.

Screen grid drive seemed to be a better option, going on the theory that the gain of the valve would be less, and possibly more linear. Either transformer or cathode follower drive would have to be used.


Eel36 was so totally different from my EL84 amp, comparing mono to mono. Click on gube image to enlarge. The amp itself had only a swing of volts for the negative bias, so my first move was to change this for a volts swing through two 20 turn pots; one for each tube. There is a perforated steel cover which fastens down over the top of the amp to prevent anyone coming into contact with high voltage terminals”. There are points to note regarding construction. Additionally, the method of bias and voltage regulation also bears some importance for maximum power output.

Q1 provides this function. A 6AQ5 or 6V6 will give nearly double the output power for less than half the heater current!


This was starting to look good! An interesting comment is sited in: It’s usefulness goes way beyond the mixer oscillator use mentioned in the data books. The second characteristic that I found problematic was that when using a fixed bias supply the grid voltage was critical within a few Volts, from trying to set an anode current of 50mA to being completely cut-off.

More valves in parallel will give more output power, but you will need to take out shares in the local electricity supply utility. FIG 3 The total valve filament current requirement is: What follows may also not be a suitable undertaking for some people.

I have tried unpacking these transformers and adding an air gap; this is okay if you want a small Watt output transformer, but as e3l6 primary inductance falls from around 50 Henries to around 10 Henries at best when tested and optimisedsl36 will effect the low frequency response markedly. Also, triode-mode usage looks quite promising, as I measured triode characteristics and they don’t look bad at all!

The problem now was that there was no way that the top cover would fit with these 2 tubes towering out of the chassis like a pair of sky scrapers! Notable is that the anode power dissipation is specified at 18W; considerably higher. If omitted there will be slight negative feedback from the 6CM5 cathode.

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. So, any line output valve is going to need a very small voltage drop from anode to cathode when it is turned hard on.

Year of manufacture of my valves is and data for them is el63 Tubes.

The language is mostly Dutch, but that shouldn’t be a problem.