My friend Vyacheslav sent me for testing an 6P36S / 6П36С output beam tetrode which was used for TV horizontal deflection circuits in the old days. Here are the nice curves in triode mode:
Low anode resistance and high current capability with its 12W of anode dissipation make this cheap indirectly heated tetrode an interesting candidate for an amplifier. Let’s have a look at the triode model:
Happy to complete the triode SPICE model if someone can translate the Russian datasheet and provide me with the electrode capacitances.
Well, how will this triode perform in a simple SE configuration? With a low Ra, a 5K anode impedance OT will work well:
With just 55Vpp we can drive this valve to produce 2W @ THD=1.6% (without considering the driver distortion cancellation). The valve can be biased nicely at 55mA and 220V.
Ale, it is very interesting to me, because 6П36С in Ukraine has a reasonable price (unlike 6S4S) :). Thanks for your test!
Glad you like them! I would be keen to read some comments on the sound of it. It’s apparently close to the EL500…
Here’s what I said) 6P36/41/42S linearly than 2A3)))
Still need to measure though, but curves look really linear to me 🙂
Haven’t tried 41 and 42S!
By the way, the power dissipated at the anode can be safely increased to 20 … 25 watts in triode mode.
Hi Ilya, do you have the power spec of the screen? Thanks, Ale
http://valvelab.pochta.ru/6p36s.htm
Well in my pocket there is always an interesting link.)))
Look Ale, site of your colleagues, which removes instrumental CVC.
Hello 6p41s the sound reminds el84 only powerful uh 6p42s very good especially with the white anode such http://audioportal.hi-fi.ru/showthread.php/63403-Лампы-6П42С-6Ф5-6Г7
FYI, I get 60W from a pair of 6P36S in triode into 2k2 Ra-a with 320V B+ and 80mA idle. These tubes can eat more than 12 watts.
Yes. Currently playing at 7W 0.2% with local feedback on a EF37a trasconductance amplifier. Killing the valve with 370V and over 70mA!