Recapped a '61 Bandmaster head. The amp used to rock 25 years ago when I put it up.
So looking around inside I see tied off 5v taps, and the death cap, and there are a couple wires moved and someone rebuilt the bias board with MF resistors and 20/20-50v bias pair. I am going to use 50u-50v bias caps and swap tubes.
So.. it's not adjustable. Where to measure and what to expect?
It just supposedta work? Really?
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
After you make sure your bias voltage is reasonable.
Measure the resistance between your Ot primary legs to the ct .then turn the amp on and measure the voltage drop where you just measured resistance. Divede volts/ohms boom plate current.
It is 6g7-a on the chart but doesn't match any schematic perfectly
I had myself confused because I swapped headboxes on a couple of these to match an oxblood 2x12 but I think this one is actually 62-3 and not the amp I thought it was.
I am going to shorten the power cable then bring it up on the variac to see if it gives a crap or just craps.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
