Quote:
Originally Posted by Electronic M
Touch the signal hot lead or connect a known good audio source to see if it gets through. If it does you've got a dead NOS cartridge (not in heard of at that vintage and somewhat common on 50s-60s carts). The cables don't pass signal, and the radio works fine then something between there and the output of the function switch has failed (dead phono preamp?).
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The Radio part works fine, no issues there, but when I touch the tonearm I get a low volume hum out of the speakers (like a groundloop style hum) but nothing when I touch the tip of the needle and touching the wires for the cartridge doesn't do much either. So what I was thinking (and it seems like we might be on the same page here) maybe the phono preamp stage might have some failed capacitors or something like that that might be causing some trouble? It is an early 70s Sony, and I know some of the Japanese capacitors from that time period are now starting to go bad due to age (being that they are over 50 years old now.)
11-21-2025, 02:36 PM
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