Quote:
Originally Posted by Leon Crampin
I can't throw any light on the term "stacked IF".
A reasonable way of coupling a 'scope to the oscillator valve in many cases is to drop a screening can over the oscillator valve, without allowing it to contact its earthing skirt.
There is usually enough capacitive coupling to the oscillator anode to get a good trace via a 'scope probe connected to the loose can. This will work even with an internally screened valve such as the ECH81 without pulling the oscillator frequency very much.
Leon.
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Looks like the mysterious stacked IF will forever remain a mystery.
Thanks for the above info. But i'm more of a transistor man. But i'll keep it in mind if i ever progress to valves.
Regards
Jay