I don't see the problem. I presume you bought a kit to assemble it
yourself. You simply reverse part of the assembly procedure, then
re-assemble it. I've assembled several KPA500s and I'd bet that you
didn't quite get it right first time. There's no shame in that. This is
a risk you take with self-assembly. ISTR there's a torque wrench setting
for tightening. Did you use one?
Have confidence. Take it apart, do as they say and enjoy feeling smug
that you fixed it yourself. :-)
Lessons learned? Yeah, take your time, follow instructions to the
letter. Don't do anything if you're tired. Plenty of space. Plenty of
light. The right tools and a suitable container for parts.
73,
Alan. G4GNX
------ Original Message ------
From: "Jim Spikes N4KH" <jimn...@gmail.com>
To: Elecraft@mailman.qth.net
Sent: 20/10/2020 00:59:06
Subject: [Elecraft] KPA500 Transformer
Looking for details from anyone who resolved issues with excessive
transformer hum during transmit on a KPA-500.
I have a hum mitigation application note sent from Elecraft tech support.
But the procedure recommended is pretty involved - removing front/side
panels, un-plugging connections, removing the transformer, changing
positions of the rubber discs, and putting it back together. Possibly more
than once, depending on the results.
There is a risk of breaking something, and I'm not sure its going to solve
the problem if I'm successful. This is a new out of the box KPA500 kit.
If anybody has any lessons learned I would appreciate hearing them.
Jim, N4KH
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