We have some shiny new thread adapters for RCA microphones. These thread adapters fit most of the 'big' vintage RCA microphones, including the 44, 74b, and 77 ranges, and also are perfect for Sony professional mics, including the C38b and C48 microphones.
We have been selling thread adapters for a while but the latest batch are a step up in quality. They are machined from solid brass and have a standard 3/8" female thread that will fit most modern mic stands. They can also be supplied with 5/8" on request.
It fits this RCA77B perfectly.
These fit the following microphones….
Most RCA 44, PB140, PB144, 74b, 77B, 77DX, MI-4010-A, BK-11.
Some (but not all) models of the RCA Varacoustic.
Sony C38, C48, FV300, Some C37s.
Many Aiwa, Toshiba and Matsushita ribbon mics
Syncron / Fairchild AU7a
Some older Amperite mics
Please ask about your microphone.