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

You may remove the body tube of your microphone to examine internally which tube is used in your mic. This glass sub-miniature tube has 8 soldered in leads. The circuit board this tube attaches tube is green.

If your P-28 has a red board and uses a tube with 5 leads it is a 5744W Tube.

This style tube must be soldered in place and must be serviced by a skilled technician.