[Elecraft] KPA500 Transformer

[Alan - G4GNX]

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" <jimn4kh at gmail.com>
To: Elecraft at 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
>