Primo M131 Ratlook

Argonne Primo Calrad M131 microphone
Primo M131

diam. 62mm / weight 302g


Customized Primo M131, also sold under Argonne and Calrad. The original crystal element is replaced with a Grundig dynamic element combined with an impedance transformer. It has great output around 1300 Ohms.

All wiring is new as is the Switchcraft 1/4" input.

The shell has been cut in half and is now 2cm shorter than the original mic.

Custom ratlook patina paintjob.

Clear varnish finish

This is the element in a turner shell: