Wow ! (no, not the game..)
Incredible. I've pluged a quartet of =C= 6L6GC inside. Ususally I'll do nothing, just play.
But this time there is a bias pot inside, and an external home made device for the measures :D
Ok, 17mV (=17mA, 1ohm resistor), it's a bit.... super cold ! about 25% of the...