[R-390] Need help fixing R390A not to trip GFI breaker

[Bill Hawkins]

Jim,

Been through this many, many times before. There were no GFCI outlets
in the fifties, when these sets were designed. The RFI filters use 0.1
mfd caps, with a 60Hz reactance low enough to trip a modern GFCI.

R390 class receivers require an Earth ground. Ground them, and do not
use a GFCI outlet. If you can't avoid the GFCI, then use an isolation
transformer, but be sure to ground the set.

You can remove the RFI filter, but consider the number of RFI sources
today that weren't there in the fifties. I say "you can do it" but no
licensed electrician can break away from the code set by people who
will not let themselves be associated with any kind of failure. Can
you say "CYA?"

Return your shop to the fifties, with a rubber mat on the floor, and
all will be well.

Bill Hawkins


-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net] On Behalf Of Jim Pruitt
Sent: Sunday, August 19, 2007 11:02 PM
To: R-390 at mailman.qth.net
Subject: [R-390] Need help fixing R390A not to trip GFI breaker

I am looking for some suggestions in repairing my R390A so that it does
not trip the GRI breaker (outlet) here in the garage/radio room.  I
thought I had a power supply problem until I tried the radio in a non
GFI outlet and it worked ok.

Thank you.

Jim Pruitt

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