Sounds like a Klixon:
http://www.sensata.com/klixon/thermostat-precision.htm
Roger wrote:
> Back in another life and time when I was working in industrial
> Instrumentation and some high powered RF *stuff*, we used some rather
> inexpensive "thermostatic switches". These were shaped similar to a TO-3
> case and operated at a fixed temp. They would either open of close and
> you would purchase them to operate at the desired temp. There is a more
> expensive version that is adjustable. I don't remember who made them,
> but I think I might have one or two off some old surplus equipment.
> I'll try to remember to look for them next time I'm out in the shop, but
> I have 5 power supplies for external HDs I have to find. My Emtron amp
> senses temp and switches the fan speed if the exhaust air gets too hot.
>
> 73
>
> Roger (K8RI)
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