Beyer M31b ribbon microphone

And today, trusted trashblitz research fellow Frans comes up with a mic so rare and otherworldly, he could probably be making the whole thing up: the Beyer M31b!

Yours Truly, Sebastian, General Manager of

The Beyer M31b ribbon mic was one of the early microphones by the company then named „Beyer“. Some sources state that it was built in the 30s, but i couldn’t find much data to support that. The first mic they built „M19“ was from 1939 (thanks,!) and say the M31b is from the 30s. Anyway, a big hug and thanks to for the data sheet. A leaflet from Revox dated 1954 mentions the mic costing ca. 400 swiss francs, gives 280 DM as price back 1954 – if adjusted for inflation that would be roughly 1400 Euros today.

a Beyer M31b mugshot

This mic was sold as broken with a pair of open ended wires were hanging out, but our ribbon mic genius of choice, Stewart from in York, UK took loving care of it and restored it to back to glory, throwing out the kitchen foil ribbon and the half-dead original transformer.

full frontal nudity!

Two questions come to mind: „How does it sound?“ Pretty good, ladies, gentlemen and the occasional pony reading Trashblitz included for good measure! Not the usual nasal, mid-heavy or honky but dark mess other vintage (that’s another word for „broken and needing expensive repairs, if, IF maybe some voodoo can bring it back to life, exotic spare parts and all“) microphones give you, but (go look for the Revox leaflet) hifi, clean, nice, and even sound.

Beyer M31b datasheet 1 of 2
Beyer M31b datasheet 2 of2

The second question „What do i do if i get one?“ can firmly be answered with „No, you won’t get one anyway, so don’t even begin to worry about that.“ As they are so rare that even Xaudia’s Stewart, who has laid his magic hands on a high number of rare ribbon mics had never seen one before in his life. But no need to grab a rope and tie yourself a noose while you reach for your potassium cyanide capsule to end your misery: you don’t need this mic, trust me. Any really good ribbon mic (Royer, AEA, Samar, ExtinctAudio, etc.etc.) will do just the same.

high fidelity in black


  • Polar pattern: Figure 8
  • Frequency range: 40-10.000 Hz
  • Impedance: 200 Ohms
  • comes with loose cable ends for tailoring the mic’s connection to you needs or 3-Pin DIN Tuchel connector
Style: (5.0 / 5)
Sound: (4.0 / 5)
Uniqueness: (5.0 / 5)
Usefulness: (4.0 / 5)

Trash:Gold ratio – 1:31b

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