I'd really appreciate a walk-through on figuring bias by measuring voltage drop on the output transformer. The patient is a '89 Marshall 2210 (pics available). I would put my skill level at being mechanically able, but not yet experienced enough to know the reasons why things happen. (Edit: What I mean is I know Ohm's Laws type things, but I can't voice an amp, decide what to change to change the tone, etc.) Thanks.