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Xaudia offer microphone re-ribboning and repair services.

2011/05/22

Transformer assembly line!


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:

  • Reslo RBL and RB 30 ohm models
  • Melodium 42b
  • Grampian ribbon mics (including GR1/L and GR2/L)
  • Cadenza ribbon microphones (wired for low-Z use)
  • RSA & Selmer ribbon mics
  • STC 4033
  • Altec and Western Electric ribbon microphones

More information.