Topband: best headphones for cw

[Mark]

On 19-6-2016 4:24, Paul Christensen wrote:
> After checking this evening, apparently Elecraft doesn't post 
> schematics of their amplifier. It would be an interesting exercise 
> comparing notes.

I suggest you contact Elecraft directly.
We broke down two KPA500's during the 2016 CQWW 160 on its PTT line, 
probably due to our own failing PTT setup.
E-mailed Elecraft for repair instructions; promptly received all schematics.
Both KPA500's were repaired within days and are successfully used in 
other contest already.

73 Mark, PA5MW