F-30 problem

F-30, 50 and 100's

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Mark I
Posts: 28
Joined: Fri Jun 16, 2006 8:17 pm

F-30 problem

Post by jgcable » Fri Oct 09, 2015 2:42 pm

Hello, I have an F-30 that has a problem. According to the tech that looked at it he gave me a note that reads the following:

It says there's a short in the 6.3 dc filament circuit, and that with the dc disabled and filament voltage jumped to v1/v2 the amp will play but it's noisy. Also the ac power is currently disconnected to protect it from being hurt by accident.

I can't afford for him to repair it so I could use some assistance as what I should be looking for. I have worked on and repaired many amps over the years but the repairs were generally replacing burnt up parts like resistors, caps, bridge rectifiers or doing bias type work.


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Single Recto
Posts: 1346
Joined: Sat Jan 12, 2008 12:32 pm

Re: F-30 problem

Post by Don » Fri Oct 09, 2015 6:55 pm

Sounds like there might be a shorted diode. Does the channel switching work?

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