[R-390] 2nd xtal osc temp control

[Larry H]

Perry, Good point on the temperature of the ovens and I agree with you.  I
found an ovenaire 55 degree 2 crystal plug in one that I'm using, but I
don't see how to adjust the 2nd osc temp.  How is that done?

Regards, Larry

On Fri, Nov 1, 2019 at 10:23 PM Perry Sandeen via R-390 <
r-390 at mailman.qth.net> wrote:

> Yo Bubba Dudes!,
> The thermostats used for the VFO and 2nd xtal osc circuits are commercial
> ones that can be adjusted over quite a wide range.  75C is 167F and is not
> good for longevity of any circuits.  Try adjusting it down to a much lower
> temperature. All the xtal box needs is a temperature just a bit higher that
> the receiver chassis gets during normal operation for stability.
> If that doesn't work one could consider a simple thermistor proportional
> heater circuit if your are a Heretic like me.
> Regards,
> Perrier
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