I found that after a few hours they would settle down but then would start a gradual drift that never seemed to end.
I listen to the old AM nets and even on 75 meters the guys are drifting around. My friend has an old Knight T-60 transmitter and I offered to convert a Heath sweep generator into a VFO for it. I have to make sure there is enough drift though; I wouldn't want him to be the laughing stock of the group. When I checked in, I apologized for using a rice box.
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