Peter, thanks....amp on it's way to Elecraft.
I will report results when I get it back.
Jack
W4GRJ

On Oct 20, 2015, at 11:58 AM, ok1rp [via Elecraft] 
<[email protected]> wrote:

Hi Jack, 

if your KPA500 has LPF board rev. D or earlier then You will need to make LPF 
TR Switch Rework REV5 modification, Elecraft parts kit: E850607. But maybe 
there is another issue in your case. 

Try to read first then decide. If you want and you have SMD tools then You can 
try to make this mods first and test if it was the case. If not then you can 
send to Elecraft service. If you have no SMD tools and experiences then it is 
better to send it to them now. The people at Elecraft service are great and 
professional so no worry about. 

It is not complicated just a bit tight on the board and not so much space 
around the parts to remove the old one. Must be done very carefully. I made 
this mod on KPA500 for two friends already and in both cases amps worked well 
after that. 

Hope it helps. 

73 - Petr, OK1RP
http://ok1rp.blogspot.com


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