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Old 27th Apr 2007, 3:37 pm   #9
Roy
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Join Date: May 2003
Location: Hertfordshire, UK
Posts: 258
Default 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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