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Maybe a loose wire or component in the phono stage?
Could you try running it through a different amp? The phono stage on your turntable is switchable, so if you could try it with an amp that has a built-in phono stage, and try the turntable in both configurations (using the amp’s phono and using the turntable’s phono), that should let you know if it’s that.
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That reciever is from 1975, in terms of capacitor life it's ancient!
If I were you what I would do is buy some contact cleaner (the wd40 is good and has PTFE in it), open it up and clean all the pots and switches inside where the connections are. It's as simple as spreading them and cycling them 10-20 times. Then hopefully that'll be it, otherwise be prepared to buy a multimeter to check that all your capacitors are working as they should, if they're not they'll need replacing, which shouldn't be hard on that receiver. Technics components from that era are laid out in very straight forward manner.
Also Hi-Fi Engine has a manual.
P.S. I've got a Technics turntable from 1979, it's great but needs some tweaking now and again. Recently I cleaned all the pots because it wasn't keeping time, and that resolved it. I also replaced the power cable because it was a bit corroded.
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rodan
Dogs
@PhilswitchEngage
So I'm starting to lose patience trying to diagnose a problem with my current audio setup, and I'm hoping that I can try and describe it in a way that makes sense and someone knows anything I can try...
Setup is Technics SA5250 receiver, Audio Technica LPW40WN, and a set of 70's Wharfedale Linton speakers. It's earthed from turntable to receiver.
It mostly plays fine - but occasionally (and usually during quieter parts of the music? Possibly coincidental?) the sound will cut out, and at best I will hear the thud of a kick drum just trying to fight it's way through. Sometimes it'll pop back to life on it's own, but I've discovered that giving the turntable a little tap will wake it back up again. Seems like the spike of audio signal seems to bring it back to life?
I've tried two different headshells on the turntable, different cables, and a couple of different audio sources into the receiver - the issue is, it's so intermittent that it's almost impossible to consistently recreate the conditions that might be causing the problem. I think it's probably the receiver - but please, I'm open to any suggestions before I pick up a cheap receiver to try that instead.
Thanks!