[Elecraft] new K3S (10195) and audio level drop when KPA500 in Oper mode

[jim rogers]

Good morning,

I have a new K3S, serial # 10195.  All was going well until I hooked up 
my KPA500 to the K3S using the Elecraft supplied aux cable (E850463).

In standby mode (on the KPA500) the audio level on the K3S is nice and 
loud, BUT when I press the OPER button on the KPA500 the audio level on 
the K3S all but disappears!

If I then press STBY on the KPA500, the audio level on the K3S returns 
to loud. Only the E850463 cable connects between the two Elecraft 
components.

The KPA500 is about 1 year old and has performed flawlessly to date.  Do 
I have a Firmware issue with the "older" KPA500 and the brand new K3S?

Thank you for any suggestion on how to resolve this issue.

Jim N4DU