Dr “Tubeology” at it…If you have a need?

Pictured the innards of a Fisher 500C, they use a similar design too Fisher 400 for the MPX FM Stereo decoder. The problem here was the MPX stereo diode decoders were not functioning correctly, solution “built my own” improved decoder. Here you see it being tested and the O’scope pic of the input to the decoder. It sounds pretty darn good after tweaking the alignment and getting finally stuffed into the chassis


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