[ARC5] BC-453 drift test

[J Mcvey]

I recapped this radio and tested the LO drift afterwards.Coupling the plate via 7pf cap and a x10 scope probe to a frequency counter, the results were as follows:The LO dropped in frequency at a rate of about 1 HZ / second upon power up.The drop rate slowed until it more or less stabilized an hour later 700 Hz lower than the start upmeasurement.Once at the bottom of the descent, it would sit and go up and down a couple of Hz in a very slow undulation.
I guess this a normal warmup scenario? What say you?
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