Tom,

Interesting post. I thought this was the case with my K3 also, but i figured out later that it was the fan in my power supply instead. Poor hearing!

-de John NI0K

Tom Doligalski via Elecraft wrote on 7/19/2020 8:41 AM:
I am the original owner of K3/100 #969, which still works great.

I’ve noticed that recently the cooling fan comes on occasionally even if the 
radio is on, but not in use (volume down, no transmitting). FP temperature 
shows 41 C, and PA temperature is at 35 C

This is not at objectionable at all, but made me wonder if this was a cause for 
concern.

Any ideas?

Tom W4KX

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