The Twin power trans?

[drewl]

Got a red knob Fender "The Twin" with a bad power transformer, open primary-unless there's a thermal fuse inside.
What'd you use as a replacement?
Standard 100w Fender tranny?

[Enzo]

My first line of defense would be to call Fender and see if that is still available. p/n is 026477.

Hmmm... The heaters are a given. Due to the hi/low power switching, you need the center tapped HV winding, so that lets out the PT from the Twin Reverb 65 RI. You also need the separate bias winding, not a tap off the HV. This winding not only makes the bias, but the positive rectification of it is used in the LED and op amp circuits. SO I don't think the Twin Amp PT works because it has a split supply for the solid state stuff, but uses a voltage doubler for bias. So it wouldn;t drop in.

SO that's my take, heaters, CT HV winding, separate full winding for bias. Not sure what model equates.

[drewl]

I'll call Fender tomorrow, got a number?
Sovtek Mig100 power trans has all you listed as I used one in a home brew, possibly a mesa 100w PT I have lying around also, but a direct replacement is always the best way to go.

[Enzo]

All I have is the dealer number, but I am sure the Fender web site has contact info.