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Interesting point. I have always thought that even if the doorknob cap was rated at 20 kv and the negative end tied to the focus potential (2 kv) that there wasn't much margin if the HV was 20 kv.
However, the schematic we have of a RCA model 1, which uses the same tube, shows 20 kv as the HV. It doesn't make sense that they would reduce the voltage for this set.
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