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Very sorry to hear that Doug. Just an idea here; maybe try splicing a small brightener transformer into the 15G filament line and only use the set on very special occasions?
CRTs that are rarely used seem to hold up pretty well on a brightener. I have a *dead* 10BP4 on a brightener in a set I use a couple of times a year. It still produces a nice bright image with the elevated filament voltage. You could probably recover decent looking emissions at ~7 VAC on the filaments. At this point you haven't got much to loose.
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