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My biggest suspects - in order of possibillties are:

1) bad thermal switch (so as not to overlook the obvious)
2) bias resistor is going bad
3) final is about to take a dump - or it has and you are seeing just the driver output on the meter
4) not enough thermal paste.

I think that if you can hear the fan when TX'ing -and the mic gain is all the way down- then some part on one of the boards must have become microphonic. A sure sign of a part ready to go bye-bye...

[QUOTE="Robb, post: 147096, member: 8446"] My biggest suspects - in order of possibillties are: 1) bad thermal switch (so as not to overlook the obvious) 2) bias resistor is going bad 3) final is about to take a dump - or it has and you are seeing just the driver output on the meter 4) not enough thermal paste. I think that if you can hear the fan when TX'ing -and the mic gain is all the way down- then some part on one of the boards must have become microphonic. A sure sign of a part ready to go bye-bye... [/QUOTE]

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