So I finally got my hands on a proper vintage turntable, a real project to restore. I’ve cleaned it up and it sounds beautiful, but I keep getting this faint, persistent crackle in one channel no matter what I do with the cables or the cartridge. I’m starting to wonder if the issue is somewhere in the internal wiring I haven’t dared to touch yet. Has anyone else hit a wall like this with an old unit?
Totally hear you. I had a vintage unit with a faint crackle in one channel that would not go away with cables or cartridge swaps. Turned out a bad solder joint on the tone arm wiring was the culprit, but it was tedious to diagnose.
I once blamed the wiring and then realized it might be the phono stage in the amp. If you can borrow a friend's phono preamp, try plugging in there just to verify. It saved me from diving back inside.
That sounds neat but I am not sure. Could be ground noise or a dirty record not inside the box at all. Are you sure you are hearing a defective channel or is it a surface artifact?
Mine crackled when the cartridge was too close to the tonearm support, shifting weight fixed it briefly. Maybe its a contact on the cartridge leads that flexes with movement.
I would check the grounds and shielding but also the interconnects inside the plinth. Old harnesses can pick up interference naturally. If you can replace the worn wires with something flexible and see if it helps.
Could be the shielding has gone and its just picking up hum. If you have not tried yet test with a different ground point or a different input to see if the crackle moves.