If I'm not mistaken, a bit of drifting is common until all the tubes are up to full operating temperature. When I'm getting a set ready to listen to, I'll turn it on with the volume down for five minutes or so, then turn everything up and find my station.
I also think that drifting reception can be a sign of capacitor failure...Chad, is this where you recommend the use of freeze spray to isolate the problem?
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