In article ,
Andrew Gabriel wrote:
In article ,
"Dave Plowman (News)" writes:

Seems the small amount of hum left is coming from the actual cartridge
or wiring to it within the arm. (It's an SME arm) Unplug the connector
at the base of the arm and the hum goes - only a reasonable amount of
hiss left, with the gain full up. Fine at any listening level.

Try connecting just the ground side of the cartridge, and see if that
causes any hum. Could also try fully connecting it, but with the
cartridge output shorted at source.

There's no actual ground side as the pre-amp has a balanced input. The
pre-amp is mounted as close to the arm as possible. The cart has an output
impedance of 2 ohms so as near a short as possible. ;-) But I'll have a
play.

The arm assembly is mounted on wood so it's not a ground loop. Moving
the arm over the deck makes no difference to the hum - so I'd guess it
isn't coming from the motor. The wiring within the arm is single wires
- but then the arm itself should screen them? I've checked it is
grounded to my star ground point.


--
*If horrific means to make horrible, does terrific mean to make terrible?

Dave Plowman London SW
To e-mail, change noise into sound.