Early 70s 50w Rebuild Issues

PeterJ_22 · Post by **PeterJ_22** » Mon Jul 21, 2014 8:42 am

here are some updated photos

http://s1289.photobucket.com/user/Peter ... t=3&page=1

neikeel · Post by **neikeel** » Mon Jul 21, 2014 9:25 am

PeterJ_22 wrote:here are some updated photos

http://s1289.photobucket.com/user/Peter ... t=3&page=1

Looks a lot better!

Have you tried Stef's suggestion of replacing the silver mica tone stack cap?

PeterJ_22 · Post by **PeterJ_22** » Mon Jul 21, 2014 7:30 pm

Changed the 500pf Mica cap in the tone stack, still no change.

SDM · Post by **SDM** » Wed Jul 23, 2014 6:48 am

stef wrote:
neikeel wrote:getting the OT primaries reversed.

Double

. Lift your NFB resistor on one end. If problem goes away, swap grid wires OR swap OT red and white wires to power tube sockets (which do actually appear to be reversed).

PeterJ_22 · Post by **PeterJ_22** » Sat Jul 26, 2014 4:16 am

Hey guys yea I figured it out, It was the OT primaries which is weird as the original board must of been wired the other way round as I didn't swap them when I rebuilt it? Anyways problem fixed - amp rocks all good!

Thanks so much for all the help and advice!

Cheers.

neikeel · Post by **neikeel** » Sat Jul 26, 2014 10:28 am

PeterJ_22 wrote:Hey guys yea I figured it out, It was the OT primaries which is weird as the original board must of been wired the other way round as I didn't swap them when I rebuilt it? Anyways problem fixed - amp rocks all good!

Thanks so much for all the help and advice!

Cheers.

, was the wiring of the trannies original?

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Early 70s 50w Rebuild Issues

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