With respect to regulating the filament voltage in order to stabilize PTO frequency: in light of the symptoms listed, I would work more toward maintaining thermal stability in the ambient conditions. regulation of the filament voltage is a red herring at best.
In a non PLL situation, an oscillator will drift when its components are subjected to a substantial temperature swing. Many analog oscillator circuits make use of NP0 capacitors to help minimize effects with changing temp. Under normal circumstances, the Drake oscillators will maintain pretty solid frequency characteristics once the circuits have warmed up and attained equilibrium with ambient temps. It would be easier in all ways to shield the rig from excessive temperature extremes while operating. Even with PLL equipment, if you subject the crystals to temperature extremes, you introduce variables into the circuits that house the frequency standards. My $0.02 Steve Wedge, W1ES/4 To be is to do - Socrates To do is to be - Plato Do be do be do. - Sinatra All my computers have my signature with various pearls of wisdom appended thereto.
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