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Did it ever show any cutoff? My Sencore has an auto-restore function that’s the most gentle of the rejuvenation settings. It pulses a 5 second shot of voltage 3 times and has definitely helped with a couple of my weak tubes. When I do visit I can bring it and if you so desire we can try it. The manual states with this function there’s no danger of damaging the filament. I think it just “cleans” but doesn’t boil off any of the surface metal.
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