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Nice work.
I recently did a second 21CT55 for another collector and unlike the first set (my set) the cathode current wanted to be around 150-170mA. I was kind of shocked since mine you have to coddle (voltage regulating power isolation transformer and a bucking transformer to feed it a constant specific voltage) to keep around IIRC 200-210.
I'm kinda jealous of that chassis I just did... It's better than my chassis in several ways albeit less complete.
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