"Eric K. Weber" wrote in message ...
Greetings:

I was just trying to point out a possible source of problems if the preamp
is used in an area with strong RF fields.

Thanks, I just wanted you to know that none of the grounds are daisy
chained...Rf is something we don't have here in our area... We are 70
miles from any radio gear except the scarce municipalities and vehicle
radios.

The resistance to ground is not
the issue... with 100 foot of antenna (microphone cable).... and 6 inches
or so of it inside the case, the issue is the wavelength of the piece inside the case.

So, if I understand, having the pin1 gnds that much closer would make
that much difference? Like I have them in the single pre? I may only
make single pres in half rack cases from now on so I can have symmetry
in the grounding, since this is something I struggled over with the
dual unit.

The non RF bypassed power supply wires entering the case could
also be a source of trouble.

The dual pre has AC entering the case as will the single unit by weeks
end. How would I rf bypass the transformer wires entering the case? Or
would this only be an issue with remote dc supplies? (since the
internal dc supply has .1uf bypasses on each rail after the filter
cap) Any suggestions?


If your venues are not near high power transmitter it may not be an issue.

And again a very nice layout and construction job.....

Rgds:
Eric

Thank you!

Roger