Jan Erik Holm <[EMAIL PROTECTED]> made an utterence to the drakelist gang ----------------------------------------------------------------------
Affeldt Fred wrote:
Good morning all.
My question has been answered in the past, I think, but I didn't note it
then. I have noticed that the idling current on my T4XC rises while in
CW mode and sending for more than a couple of minutes. Clearly heat
related, I think. Neither output power nor signal change, but between
characters the plate current rises from about 100 or 110 mils to about
180 mils during the course of a long transmission.
I have a fan on the rig, blowing out, and it stays cool to the touch. I
have replaced the AC4's aged components with the board from the Heathkit
Shop. I don't see this same phenomena on phone, but suspect the rig runs
cooler on phone with the lower duty cycle.
So, my questions are: is this typical behavior?
No >
Is there reason for concern?
Yes >
Where might I look for causes?
Replace the 6JB6 final tubes.
73 good luck SM2EKM
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