When I picked up a turntable two weeks ago I planned to mount a Sonus Blue (circa 1978) which I did. Very quicly, the turntable exhibited a problem with restricted arm movement but was able to play the first 5 minutes or so of an LP. During that time the Sonus worked properly and sounded good enough to make me look forward to more lengthy listening.
The turntable went back to the shop it came from to remedy the arm problem which was done the same day but when re-connected, only the right channel produced sound.
At first I looked elsewhere before considering the fault originated at the turntable. I installed a different headshell and cartridge and both channels were fine. I plugged in the Sonus/headshell combo again and still a dead channel but now also hum.
Long story short:
the Sonus has 315 ohms on each side,
there is continuity from the cartridge leads to the RCA plugs,
there is continuity from one end of the cartridge leads to the other even when pulling them back and forth - taught to loose,
the cartridge terminals have been cleaned,
the cartridges ends of the leads have been cleaned,
the headshell ends of the leads have been cleaned,
the headshell pins have been cleaned,
the headshell contacts entering the arm have been cleaned,
the contacts within the arm are shiny bright.
Can one conclude then that there is something amiss with the Sonus cartridge despite measuring 315 ohms on each coil? Because it would seem to me that since there is equal resistance on both sides, there is continuity so therefore the coils are good.
Might be worth mentioning that when the Sonus is in place, the hum intensity increases the closer one's fingers get to the headshell.