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michael_krell
Newbie Alert
Joined: 31 Jul 2005
Posts: 3
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 Posted: Sun Jul 31, 2005 2:28 pm Post subject: Fender Bandmaster AB763 |
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Hey. So i just finished rebuilding this bandmaster back to AB763 specs, the only original parts are the transformers and choke and pots. There is clearly a problem with the power amp. The preamp works fine. I tested it out and everything works. when i plug it into a cab and turn the standby on, I get a horrible sound that is incredibly loud. The frequency is about 2kHz, which i measured on my scope.
everything up to and after the PI is working. Im thinking of pulling out the output transformer and testing it, but i dont think that is the problem, because it worked not too long ago. I am going to retrace everything again, but im sure there is a problem with the power amp. |
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roknroll
Tadpole
Joined: 04 Aug 2005
Posts: 22
Location: NY
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| Posted: Thu Aug 04, 2005 4:19 pm Post subject: |
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Hi
Did you try reversing the leads on the speaker output jack?
_________________
Jack
www.rocknrollamps.com |
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TheEnchanter
Tadpole
Joined: 19 Oct 2005
Posts: 22
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| Posted: Thu Oct 20, 2005 7:29 am Post subject: |
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| You got the Blue and the Brown wires off the output transformer backwards. |
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