Phil Leigh;595836 Wrote: 
> Just to be clear on this, a "ground lift" switch disconnects the chassis
> ground from the signal ground. It does NOT remove the chassis ground,
> which is what you do if you plug a 3-pin plug into a 2-pin socket!.
> 
> 
> The general advice on this is that if equipment is shipped with a 3-pin
> plug, it MUST go into a 3-pin socket (UK and US codes differ slightly on
> this point).
> 
> There IS a risk (albeit VERY slight) of electric shock in the event of
> an internal fault which allows the chassis to become live, if you have
> disconnected (not lifted!) the Ground.
> 
> The proper fix here is to figure out why you have a ground loop. Is the
> equipment sitting in a metal rack? That is often the cause of such
> problems.
> 
> I would disconnect all equipment from the "outlet" apart from pre-amp,
> power amp and TP and see if the hum persists.

aha. learned something new about a ground lift!  And of course the best
answer is to resolve the ground loop issue!


-- 
garym
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