EL36 TUBE PDF

Akiran Canberra based design engineer Patrick Turner is one who has investigated audio applications for the 6CM5. 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. What did become apparent was the less bias the 6CM5 had, the more power it would produce without distortion. And finally, keep in mind that the el current for this amplifier is 2. EL36 The Valve Museum Looking at how much power you need to get a cherry red anode around 40 Watts all I can conclude is that the 12 Watt rating is conservative.

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Akiran Canberra based design engineer Patrick Turner is one who has investigated audio applications for the 6CM5. 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. What did become apparent was the less bias the 6CM5 had, the more power it would produce without distortion. And finally, keep in mind that the el current for this amplifier is 2.

EL36 The Valve Museum Looking at how much power you need to get a cherry red anode around 40 Watts all I can conclude is that the 12 Watt rating is conservative. The anode dissipation limit of this valve also brings some interesting questions to mind.

Pushing the EL36 family of tubes this hard may reduce their lifespan? There are points to note regarding construction. Then after putting the tubes in, work backwards checking cathode current at each tube cathode 1 ohm resistor pin 8. The 6CM5 is not a plug in equivalent, although it might have the same or similar connections.

The EF86 pentode, is responsible for high sensitivity tuge poor noise performance. Also, the sound was very bright. The 6AV6 is really half a 12AX7, but just about anything could be used for this stage. The transformers are mediocre at best, though. If the 6CM5 should start to draw more current, the voltage across the 50 Ohm cathode resistor will rise, el3 the 6CG7 control grid more positive.

Also, separate feedback windings. Deduct this figure from and what you have left you will e36 to source a transformer of the remaining volts about — ma for a pair of tubes or — ma for a quad.

These are an old TV horizontal deflection tube with a plate dissipation of 11 watts. BoxVilnius, LT, Lithuania. One of the photos shows a re-wound power transformer with the extra screens grid 2 winding on two tags previously used for the 20 volt bias winding. When considering the EL36 it is important at the outset to be aware tbue there exist two types with the same designation.

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 means that for Class A audio, the 6CM5 is one of the worst valves you could use. Such performance merits further investigation. However, having the design knowledge and winding facilities for transformers myself, it is of course convenient for me to do this.

The input drive is still effectively from grid to cathode. The total output power was in the order of Watts RMS. 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. Data obtained from different sources indicate different limits; from 10 to 18 Watts dissipation for the anode and 4 Watts for the screen.

My latest and successful experiments came from the theory that RC coupling was probably not such a clever idea for screen grid drive.

The screen-grid voltage is set by the 6CG7 cathode follower; about 25V is what is required for correct 6CM5 anode current. After having thought about some of the problems for a while I next tried a low impedance direct driven grid, with fixed bias, the cathode earthed, and the valve in triode mode. Beam tetrode The EL36 is a plentiful output valve in Australia as discussed by many others.

Lots of power at low anode voltages. If not, you will need to re-think this; possibly with a very small, few milliamps 40 volt transformer to give the higher needed voltage. The input transformer is from Altronics and is a nice low cost mu-metal screened one. My circuit yields somewhat more output than say a 6BM8. Negative feedback is provided in the shunt form by the kOhm resistor, with the 0.

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Ratings for use in Class B push-pull are readily available from Philips datasheets available on the internet. An anode voltage up to V, screen voltage of V, and a relatively low anode to anode load of 3. You can visit his website article and pic of this amplifier. They are always sad to have to return it when their solid state amp is fixed. 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. The input tube is a paralleled 12AT7. The output transformers were made in in Sydney and the power transformer and chassis is a new one by T.

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