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In Reply to: Re: Fisher FM50-B Tuner posted by jayt on December 26, 2003 at 09:50:10:
Jeff -I also suspected a cold solder joint, and hearing your experience was reassuring.
I reflowed the mpx section and the output section. I also replaced all of the electrolytics under the chassis and the output coupling caps.
With about 20 hours of listening the shotgun approach appears to have worked!
The Fisher FM-50b is a pretty nice sounding tuner btw - not as sensitive as my FM200B or R200's but every bit as musical sounding on a good signal.
Many thanks!
Follow Ups:
Gary,Your welcome, glad it works now. Probably a very warm sounding tuner. I'm in a suburb of Chicago and there is a station WXRT 93.1 that is classic/album rock and the DJ's voices that come out of my 500B are just too lifelike to describe!
BTW, was it in the MUX section, ie did both channels work in mono mode only to drop when stereo? If so your problem was most likely in the MUX section.
One other note, my 500B is haunting when it comes to pulling in stations, even in my basement w/ no external antenna, I can pick up a Kenosha, Wi station loud and clear. Might want to check the alignment out.
Glad to help,
Jeff -Unfortunately, other than the simple alignment used by Dynaco FM3's I have no experience with FM tuner alignment. I do have basic instruments (scope, 5mhz function generator, HP334a distortion meter and frequency counter etc) but no sweep generator. Any good references or basic instructions for getting started?
Gary,Unfortunately I did not have to align any of my units, however I have "tweaked" the front end using the tuning eye or meters, whichever the tuner has and w/ success turing ever slightly and carefully getting the front end (the tuner gang adjustment screws, or the rf section as in fisher tuners) up to par.
I was suggested this by others who do these restorations. I DO NOT touch the IF or Mux sections. If I would ever need it done, i would contact paul at BizzyBee since he is only a 1/2 hour drive from me.
http://www.2baudio.com/However for both of my 400 and 500B, the service manuals do have the alignment procedures.
Hope this helps,
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