[Amps] Fan control

[Gary Smith]

I still haven't gotten round to putting in 
a fan control into my old Alpha. There is 
a wire resistor with slider that allows 
changing the fan speed and I have it on 
maximum RPM right now and the blower noise 
is excessive when un-needed.

I think if I had a thermostat with the 
probe in the hot air duct and a 2nd slider 
on the resistor, the fan could be set low 
for normal resting & brief transmissions & 
when the temp goes up, the fan could kick 
in all the way.

Has anyone done this and if so, is there 
an inexpensive small thermostat you can 
suggest which I can install inside the 
control section of the amp to do this? I'd 
be fine with running the cabling out the 
back & into the duct, I'm running my 
thermometer into the duct and it works 
perfectly.

Seems like a small digital/mechanical unit 
with outputs to fire a SS relay would be 
ideal. I've looked at what I could find at 
the last two hamfests but no cigar. Yet.

73,

Gary
KA1J