A 6072AM P24vacuum tube, microphone tested, for replacement in P-24 microphone. Please note, the M at the end of the tube id number denotes the tube as been tested for microphone. (6072A vs 6072AM) this 6072AM microphone has been tested for the P-24. The P-24 microphone use both sides of this dual triode tube. Our standard 6072AM tubes only have one side of the dual triode tested for microphone quiet.

Please note, some model 22 251 microphone implement a 5744 WB sub-miniature soldered in tube.