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Wiggling every tube in sight got me nowhere, but after cranking up the AGC control I'm getting a healthy scratch (visual & audible) when I change channels. Maybe cleaning the tuner will help. I don't see any easy snap-off panel that can be removed. I guess you need to unsolder the connections and remove the whole tuner assembly.
Phil Nelson
P.S. I did go through my usual routine of cleaning all tube pins & sockets at the start of this project. I suppose it can't hurt to re-clean the sockets in the tuner & IF, etc.
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