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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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.

NEWNES pp ” The EF86 pentode has a heater structure as a helix and e3l6 electrostatic shield around the anode mesh both designed to reduce hum in audio circuits. The anode voltage should be V when the 6CM5 anode is drawing 45mA.

6P31S = EL36 = 6CM5 tube. Beam tetrode

Their ratings are usually max volts plate and screen, but with a 7kv peak pulsed plate voltage. To achieve the necessary voltages just do the following: The reason for using DC coupling becomes apparent when we see that the grid of the 6CG7 voltage amplifier is connected to the 6CM5 cathode tubr an adjustable voltage divider. With no bias and 25V on the screen, the anode was drawing 45mA at V.

A pair of valves were used in Class AB1 push-pull, with most of the output coupled to a modulation transformer and some driving another 4 in Class C yes, ep36 read it correctly. The EF86 pentode, is responsible for high sensitivity but poor noise performance. Hube is a whopping The bias transformer would be very small.

Looking at the data, we see the anode dissipation is about 10W max yes, it can be slightly higher depending on screen dissipation, but I prefer to be conservative. A pair for watts, fixed bias with a volt stabilized screen supply, volts on the plates!! He comments “I have a particular love of the as an audio valve, so here is my simple grounded grid amplifier. Maximum output was about 2. In many respects the data for this valve indicates general similarity, but clearly the two are not immediately interchangeable.


Data obtained from different sources indicate different limits; from 10 to 18 Watts dissipation for the anode and 4 Watts for the screen.


Feedback isn’t applied to the 6AV6 as it’s a triode handling low voltage and in my opinion it isn’t necessary. I didn’t need them in my prototype as a regulated power supply was being used a BWD with very low output impedance.

This helps ensure that you do not exceed the valve’s filament-cathode potential rating limits. Grid and screen grid stopper resistors are a must if you want the ELCM5 to be stable and not go into parasitic oscillations.

I intend to go ahead tybe use the 6CM5 in single-ended Class A applications but only where heater current isn’t a problem and a couple of Watts is acceptable output. So, any line output valve is going to need a very small voltage drop from anode to cathode when it is turned hard on. More gain could be obtained by bypassing the 6AV6 cathode resistor.

Also, you can’t simply plug in EL34’s, this won’t work. Well, firstly, in tbue mode it sounds a lot better than a single-ended 6V6 or EL34, and better even than a single-ended 2A3, and secondly, its low cost.

EL36 / 6CM5 (RFT) tube – POWER / OUTPUT tubes –

So the humble 6AU6 should be OK. Such is not uncommon for most power pentodes used this way, apparently. 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.

This too is better than the original quad of EL’s which managed watts tops at best! It is only the second HT transformer that might be on the larger size?

This makes a nice simple power amplifier. If you feel uncomfortable with this, simply lift the ground of each pot through a 10k resistor per pot or a common grounded one of 2. It is equally adaptable for the EL 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 This means about 40mA anode current at V which is similar to the likes of 6M5, 6V6, 42, etc.


The cathode follower has only current gain, so we need a grounded cathode stage to obtain some voltage gain. Then hardwire the former anode, EL34 pin 3, to the top-cap dl36 the EL The way tubf is connected means that if it should go open circuit which is the normal method of failure of a preset potthe 6CM5 will be throttled back.

Very little is published on this, so take heed!

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

I guess I should emphasise that my disappointment with this valve was with its application in single-ended mode. A lot of fixed bias circuits ek36 usually quite high and are deliberately reduced accordingly.

I suspect very strongly le36 there are some hidden aspects to the EL36 design that may be still to be uncovered. Here, the drive for V1 is taken from the cathode rather than the anode of V2, and so needs to be phase-inverted to provide the correct drive phase polarity for V1.

When considering the EL36 it is important at the tubee to be aware that there exist two types with the same designation. However, the DC stabilisation circuit I have subsequently used seems to have solved that problem.

I built five of these on the same chassis for a home theatre amplifier for the five main channels; the sound is glorious and a lot easier to listen to than a solid-state amp! What did become apparent was the less bias the 6CM5 had, the more power it tubf produce without distortion.