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The-Planet 26th December 2003 01:30 PM

Fisher FM50-B Schematic Needed
Anyone have a copy of the Schematic (or better yet, the service manual ) for a Fisher FM-50B tuner?

I have a nice FM50B here that has started dropping out one channel when it warms up.

Many thanks,

- Gary

bournville 26th December 2003 02:10 PM

If you can't get one from any other source, you can buy one from these people reasonably priced:

The-Planet 26th December 2003 02:43 PM

Thanks, pretty inexpensive for the service manual ($5.75).

egellings 20th January 2013 07:30 PM

I have one of these tuners, too, and both channels played very faintly. If I yanked out the 12AX7 audio amp tube, there was no difference. Turned out that the two 0.1uF coupling caps near the tube were open. Replacing those brought it back to life. I'm looking for a service manual, too. Finally figured out how to re-string the dial cord. Nice little puzzle to solve.

Tom Bavis 21st January 2013 01:34 PM

FM-50 (no 'B') manual is online at Likewise, FM-50 is covered in Sams Photofact folder 553-6, but 50B isn't listed. I've heard that KM-60 is the kit version of the FM-50B - that one is at

egellings 22nd January 2013 01:21 AM

Hi, Tom,

egellings 22nd January 2013 01:22 AM

Hi, Tom

Thanks for the info; I'll check it out. I wonder why the FM50-B information is so obscure.

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