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JPAC and PSU - what to unplug?

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mgb:

Oh ok, I get it.
I assumed that you can just let the 5volt, etc stay.
I did miss something ;D

Arch:

@BobA: Worked like a breeze! I had the fire exstinguisher at the ready when plugging it in, but I had no hassle at all, so thanks!  :applaud:
On a sidenote, the isolating transformer gives off a constant high pitched hum of sorts. It also did this before I did the rewiring. Is this normal?


BobA:

The very noticeable hum or whine is often due to the laminations in the transformer getting a bit looser with age.  Seems to be a common problem with older units.  Don't think there is much you can do about it except replace the transformer.  Even some newer transformers hum a bit.

mgb:

here's an article from Bob Roberts about that
http://www.therealbobroberts.net/iso.html

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