[Elecraft] KPA500 Assembly Help

[Andy Durbin]

"The instructions call for 3 disks on the bottom and one on top."

I had the same question when I built mine.   I think I put 2 on bottom and 1 on top.  Even that is tight for the bolt length.   Elecraft actually has a mod kit with a longer bolt and more rubber discs.  I don't know why that is not included in the kit.

You should read the Elecraft paper on hum mitigation for more discussion on rubber discs and bolt length.  Get it from Elecraft or email me and I'll forward it.

Andy, k3wyc