A 6072AM vacuum tube, microphone tested, for replacement in 22 47, 22 251*, P-12 microphone.

An NOS 6AU6A vintage vacuum tube, microphone tested for signal and quiet noise floor, for replacement in the Sony C37A and C800g and the Altec 21B  microphones.

An NOS 5654W vintage vacuum tube, microphone tested, for replacement in the Peluso P-280 microphone.

5693/6SJ7 Tube for 22 47 SE

An NOS 6J1-B-Q vacuum tube, microphone tested, for replacement in early Peluso P-28, with serial numbers below 00600, and Peluso VTB microphones.

An NOS 5744 WB vacuum tube, microphone tested, for replacement in the Peluso P-49 and some 22 251 MK2, and most  P-28 microphones.

An NOS 7586 vacuum tube, microphone tested, for replacement in the Neumann U64 microphone.

an NOS EF12 vintage steel vacuum tube. Microphone tested. Fits the Peluso 22 47 LE microphone.

An NOS EF14 steel vacuum tube, tested for microphone, for replacement in Early Peluso 22 47 LE microphones.

An NOS EF-95 vintage vacuum tube, microphone tested, for replacement in the Peluso P-67 microphone.