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Old 08-17-2021, 11:12 PM
Isaacc7 Isaacc7 is offline
Senior Member
Join Date: Oct 2020
Posts: 184

Turns out the 2e22 has a max voltage of 250 volts on its screen grid. That is a ways below the 290 from the Firebottle. Oh well. It would have been fun to run a directly heated pentode. Though I'm not sure if a heater circuit not designed for directly heated tubes would cause audible problems.
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