1970's Fender Bassman 100 Running Hot

[TigerAmps]

Hello All:

I have a 1973 Fender Bassman 100 (Master Volume) head that is running HOT and the chassis itself is hot!

Prior history:
a) Power tubes were shot.
b) One of the 470 ohm resistors on the power tubes was burned or open (I forget - it's been a while since I looked into this amp)
b) 100 ohm filament resistors burned or cracked in half
c) Had a hum from a bad ground on one of the power tubes.

Current state:
a) New Filter and Bias caps
b) New master volume pot (1M)
c) New 100 ohm filament resistors (original were cooked)
d) Grounds were all re-soldered
e) Replaced all the 470 ohm and 1.5K resistors on the power tubes
e) Amp is running with 446V on the plated and idling at 23ma to 25ma with a matched quad of Sovtek 5881WXT's

The amp is quiet (no hum) and sounds good (no distortion).
I think the tubes are running at a reasonable operating point in terms of idle current - maybe even a little cold (not sure).

Any ideas why it might be running unusually hot?

Could the power transformer be damaged even though the voltages look reasonable?

[Jazz P Bass]

it sounds like you had a power tube that puked the B+ into the screen & the heaters

That could have upset the power transformer.

I would try to get a reading of the power drawn from the mains (I use a Kill-A-Watt) with the amp fully stuffed with good tubes, at idle.

If it is drawing more than 120 watts, something is amiss.

The power transformer itself should draw next to nothing with all of the secondaries disconnected.