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I've tried auto restore on a few CRTs including 10BP4s, but not a 10FP4. I can't honestly say that I've ever seen a big improvement. Generally, the emissions will improve for a while but gradually decline. Never saw much improvement in cutoff.
Any chance you could try it in a another set ? Is the cutoff more responsive if you change the bias range on the CR-70 ? If so, perhaps you could tweak the bias in the set to shift the 10FP4 into it's "sweet spot".
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