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Yes, the CTC40 uses an HV rectifier tube. It might also be a CTC44, which I believe is similar to the CTC40 except that it uses a tripler instead of a tube rectifier. And, I hate having to deal with rude sellers! If they act like they don't want to be bothered; then, why are they even trying to sell stuff? It might be worth checking back into. Maybe they will be in a better mood or you can deal with someone else. I hope it does not turn into another one of those "the price is $500 and I'm not coming down" deals.
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