The difficulty in driving an electronic tube microphone from a standard 3-pin XLR interface lies not in voltage, but in current. The phantom power supply of most microphone amplifiers only provides a current of about a few mA, which will never exceed 20mA, while the filament current of common electronic tubes exceeds 500mA! In contrast, the high voltage required for the anode seems insignificant. Perhaps some modified power supply systems? But more current means greater heat generation, and the voltage doubling circuit is also quite dangerous. I'm not sure if it's worth it......