[78-L] NULLING VERTICAL COMPONENT - was: stereo/mono and noise reduction

[Mark Durenberger]

Uhhmm...I'm not sure it's good to jumper most cartridge outputs together.

What I find works well is to install a proper combining pad for the outputs 
of the preamp; set the preamp gain controls so the output is approximately 
equal with 'Left-channel-only' and 'Right-channel-only tones'......THEN put 
on the L-R test cut and trim one of the preamp gain controls for minimum 
output.  With a properly tracking cartridge and decent test disc you'll get 
a great null.

Regards,

Mark Durenberger

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> I think it's best to combine the signals as near to the cartridge as
> possible because even the cables have capacitance and inductance which 
> will
> alter the signal differently so it won't cancel as well when combined
> later. I put jumper wires right on the cartridge clips.  If you combine 
> the
> signal after amplification it will be even worse, due to distortion in the
> amplifier (and they all have SOME).