[Elecraft] KPA500 TR switch mod kit

[Jim Clymer]

You might be referring to this from an Elecraft repair invoice:

"Replaced Q5, D7, R3, R9 and R24 for Transmit/Receive MOD (Improves
robustness in Transmit/Receive circuitry)."

My KPA500 was back to the factory in March and had this mod installed. That
didn't help much in the "robust" department, because my amp went south
almost immediately after its return. Apparently the PIN diodes D8, D9
and/or R7 have failed. I received many replies to my question on this forum
from others who had the exact same issue. The symptom is recieve signal is
attenuated about 20 dB when Operate is engaged; normal in Standby.
Jim - WS6X

On Mon, Jun 21, 2021, 8:09 PM HP via Elecraft <elecraft at mailman.qth.net>
wrote:

> I saw in archives that there is a KPA500 TR switch mod kit - I cant find
> it on
> the Elecraft parts web site .My KPA is circa 7/2014 .
>
> Does this exist and what does it consist of ??
>
>
> Hank K7HP
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