In message ,
lid writes
I have a Project 1 turntable fitted with an Ortofon 510 cartridge.
It's been working fine for years of light use. I recently moved house
and on setting it up again, I found there was a loud buzz on the left
channel. Switching the plugs around at the amp switched the buzz to
the right channel so I know the amp is ok. I thought that maybe there
was a problem with the connections to the cartridge so I disconnected
the wires to the cartridge and reconnected them making sure there was
nothing shorting or whatever but still had the same problem. However I
found when I was disconnecting the cartridge using a tiny pair of
needle nose pliers as I can't get my fingers in there, I touched both
the blue and green leads with the pliers and the buzzing stopped. A
bit of experimentation showed that while these connections were
crossed I had sound on both channels and no buzz. I have no idea what
this means. Can anyone tell me if this might be indicative of a
knackered cartridge or cable?
Cheers
Paul

Sounds as if you've got a break in the return (green or blue) wire from
the cartridge. Are your headshell wires red, white, green and blue?

If you've got a multimeter, unplug the wires from the cartridge and
check for continuity between the shield of each of the two co-ax leads
and the G or B wire at the headshell.
--
Chris Morriss