I have a marshall class v amp, and it has a couple ecc83 preamp tubes. I have been wanting to make a 12v tube overdrive, but just can't justify the price of a tube. So I want to just borrow one from my amp to test a circuit. Thing is, I don't know if the tubes themselves need discharged before they are safe. I know the caps need to be, but that is just a simple warmup-full volume blast-sustain-shut off. Reason I ask is because I know tv tubes need dischared, and just wondered if amp tubes have that same dielectric-absortion effect. And kudos to the one who can help me decode the mystic tube socket black magic... Er, numbering. I know 1 is on one side of the key, and 9 is on the other, but how are they numbered? a) Looking down onto the tube (glass end), or b) looking at it from the bottom (pin end)?