The AC may be leakage from a ground loop, miswired power cord or wall
outlet, AC line bypass cap, etc.
When the amp is keyed the tubes are conducting in idle state, 90-100 ma is
normal for 572B's. It doesnt require the input coax to be hooked up.
Carl
KM1H
----- Original Message -----
From: <walnutcreek@appstate.net>
To: <amps@contesting.com>
Sent: Monday, November 26, 2007 8:35 AM
Subject: [Amps] SB-230 converted to 572b's
> Hi all,
> I thought I had all issues resolved, but one more to find and fix. I'm
> seeing voltage on the RF input terminal (3VAC) with the amp keyed and no
> input(not even hooked to a tx). The plate shows 100 ma in this status and
> from what I understand it should be 0 ma. Am I correct?
> Thanks,
> Cam
> WA4JKW
>
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>
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