On Wed, 30 Aug 2006 12:21:01 +0100, "Keith G"
wrote:


"Don Pearce" wrote in message
...
On Wed, 30 Aug 2006 11:30:34 +0100, "Keith G"
wrote:


Forget all the theories Don, it was a short either in the cart or the
wiring. No amount of 'waveform analysis' was going to beat a bit of
tapping
about with a fingertip here....


Whatever it was , it wasn't a short in anything - totally wrong set of
symptoms.



I disagree, the hum started when there was lateral force on the stylus -
suggesting an internal problem stemming from cantilever movement. If not a
'dead short' then summat near enough to induce hum.

No - that would have resulted in a very different sort of buzz - you
would have heard the rapid connection and disconnection noises, and
they would have modulated the sound. None of that was happening. And
shorts don't induce hum - they make the signal stop.

Anyway, whatever - *my* suggestion to replace (or refit) the cart appears to
have been the fix he needed....


Err.... he got the whole thing replaced by Richer. (deaf spider alert
here!)

d

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Pearce Consulting
http://www.pearce.uk.com