Ampegs are weird!~

[drewl]

okay, forget the odd tubes, the strange designs, bizarre controls......somehow they ,manage to sound good.
I've got an OLD one that looks similiar to a 625.
I had refurbed it before, my friend sold it, and it got damaged in shipping.
The customer sent back only the power amp section, and I managed to figure out what to jumper to similate the switches that are mounted on the preamp section.

So before firing it up I take a few readings...
extremely high resistance readings on OT primary (5M)..open right?
well I put a load on, fire it up and it's screaming out 20-25 watts from 2 Cathode biased 6L6's...(originally it used EL37's!!!!)

power it down...and I get normal resistance readings from one side of OT (85ohm), and ~ 10K on the other side???

.....what da' fudge?

[Enzo]

Still sounds fishy, dewire it and see what you get.

I always have an old Bassman OT on the bench. I clip it into an amp in place of whatever was there originally to A/B verify the old part bad. For just testing good/bad, we don't care if the impedances are off. SImple substitution of something even remotely close should answer other questions.

[R ski]

Assuming that your probes are not being fooled by oxide solder.

The OT had OD

Both sides should be equal to some respect of 85 ohms