Ken Rone Posted November 11, 2021 Share Posted November 11, 2021 Particularly confusing is that the output transformer to the speaker is not shown in the photos I have looked at, I see it in the schematics but not in the position on top of the chassis (centrally). I don't know how to test it and don't know its specifications if I have to replace it. The same holds true for most of the other stuff too. I do have all 4 tubes but again don't know if they are any good and how to test them. - Quote Link to comment Share on other sites More sharing options...
badbluesplayer Posted November 13, 2021 Share Posted November 13, 2021 Not sure what model that is, but the output transformer is probably the thing on top of the chassis that's wired to the speaker. I'm assuming those wires are connected to the speaker. The best way to test it out is stick some tubes in there and fire it up and see if it's working. Any sound? Do the tubes light up? Trying to refurbish those things is a little tricky. You can test it out on the bench like that. Just keep the output transformer wired to the speaker whenever the amp is on to protect the output transformer. In order to test the transformer for continuity and shorts, you'd have to disconnect all the wires and apply some AC voltage to one set and see what AC is on the other set. That's not something you can do unless you have a variac. Best thing to do first is stick the tubes in and fire it up and go from there. Quote Link to comment Share on other sites More sharing options...
Bill Moore Posted November 17, 2021 Share Posted November 17, 2021 I sure would be worried trying to fire it up without checking the power supply capacitors! If they are original, you could easily lose the PT! Quote Link to comment Share on other sites More sharing options...
badbluesplayer Posted November 20, 2021 Share Posted November 20, 2021 On 11/17/2021 at 1:41 PM, Bill Moore said: I sure would be worried trying to fire it up without checking the power supply capacitors! If they are original, you could easily lose the PT! You're probably right. And rewire a three prong plug in there while you're at it. Quote Link to comment Share on other sites More sharing options...
Bill Moore Posted November 24, 2021 Share Posted November 24, 2021 As one familiar with the 2 prong systems, I have an old 60's amp that I still play, but "someday" I'll convert it to a grounded plug! The drill is, hold guitar and brush back of hand across mic, get a tingle, reverse the plug! Quote Link to comment Share on other sites More sharing options...
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