These nickel plated brass thread adapters fit most of the ‘big’ vintage RCA microphones, including the 44A, 44BX, 74b, and 77 ranges, and also are perfect for Sony professional mics, including the C38b and C48 microphones, and many other older American and Japanese microphones.
5/8” internal thread available £10 each plus postage.
Microphones we have found so far that these fit include….
Most RCA 44, PB140, PB144, 74b, 77B, 77DX, MI-4010-A and 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