Re: FM tuning drift - any ideas?
Variable capacitance tuning can be perfectly stable, even without AFC. Philips, for example, produced some excellent sets using this method of tuning.
Hopefully another B&O owner will be along soon, to confirm whether or not your set's behaviour is normal for that model.
Have you tried a few different ECC85s yet? You may find one which reduces the drift to an acceptable level. The other thing I would check is the HT supply to the VHF front-end. It may be low, or varying with temperature as a feed resistor changes value. If the set is very compact, and the front-end is influenced by heat from the power supply or output stage, there may be little you can do to improve it.
Hope this helps,
Roy
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