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
Here are our updated transformer boxes, looking smart with a new metal badge and hammertone paint. They come in a rugged metal box with Neutik XLR connectors at each end for easy use.
These little gadgets are perfect for interfacing old 30 and 50 ohm microphones to modern equipment that expects to see 200 to 600 ohm microphones, and can give an increased output of up to around 12 dB, which is welcome for older ribbon mics.
They are available in a range of ratios, and our most popular model is the 50 Ω to 600 Ω box, which is ideal for Melodium 42B, STC 4033, and Western Electric / Altec 639 ‘birdcage’ microphones.
Anyone who has ever tried to put a Melodium 42B on a mic stand knows that it is challenge, if the original adapter is missing – which it often is.
So we have made some replacement adapters. These are machined from 1 inch (25 mm) solid brass bar, and fit snugly inside the yoke. There is a shoulder to support the weight of the heavy microphone, and a recessed band to accept the thumbscrew. The base is tapped to accept a standard 3/8″ mic stand thread.
Melodium 42B with Xaudia stand adapter
The Melodium 42B can now be securely mounted on a stand. Problem solved!
This week we have been building lots of little transformer moxes to match vintage 30 ohm ribbon mics to modern mic preamps. Correct impedance matching can deliver a +12 dB increase in level without noise penalty or loss of frequency response, which is welcome for many older microphones. Here is how a Reslo RV microphone behaves with and without the transformer:
Frequency response plots for Reslo mic with and without an impedance matching transformer
They are suitable for many old microphones including the following: