[Elecraft] KPA500 Transformer

[Jim Spikes N4KH]

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