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Either would probably be okay. My 21CT55 has an old 12V computer fan (straight from my PC junk bin), running off 6Vdc of rectified, filtered heater voltage.
It is only rated to draw about as much current as a 12AX7 running at 12V so at 6 it should draw around half that. At 6V a noisy high flow 12V case fan runs quiet and moves plenty of air for a small HV cage.
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