MOTM

Turns out if I plug any module directly into the amp (bypassing the 
mixer) the hum is completely eliminated.  (The mixer does not have a 
3-prong plug - time for an upgrade.)  JLH suggested the 900 makes the 
mixer hum; I agree.  I'll just bypass it for now.

Thanks for the info.
GK

--- In motm@y..., "Paul Schreiber" <synth1@a...> wrote:
> 
> 
> > Paul, I live in a condo, so that's a safe bet!  Turns out a 2-wire
> > adapter eliminates the hum, but now whenever I connect a jack from
> > the out-board mixer to a module there is a good sized POP.  If I
> > first zero the mixer's input level, this becomes just a slight
> > "scratch" which is not too objectionable.  Once the mixer's 
plugged
> > in, everything's pretty quiet.
> 
> The *only* way to fix this is to use isolation transformers. 1 on 
the mixer,
> 1 on the MOTM.
> Allied carries these for about $50ea. I have a big-assed honkin' 
one on my
> bench (it 'floats'
> the whole test equipment setup).
> 
> Paul S.