Generally, a tube microphone is a condenser microphone that uses a tube (often a 12AX7 or similar) for gain and to help drive the mic cable. Condenser mics that don't use tubes have a FET or op-amp to do the same task. The catch (cost aside) is that tube condenser mics require a dedicated external power supply, while solid state condenser mics can run off standard 48V "phantom power" provided by the mic preamp.
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