RCA 77DX Ribbon Microphone Repair

$180.00Read more



This RCA 77D came in with an extreme sag to the ribbon, resulting in a very thin sounding microphone, with very little low frequency content.


Diagnosis: ¬†Nothing that a good cleaning and a new ribbon can’t fix.


Here is a view of the ribbon motor. ¬†For the size of the microphone, it has a very small geometry ribbon, the gap measures .6″ x 1″


Here’s a picture of the newly cut ribbon for this microphone (with a guitar pick to give an idea of size)
New ribbon corrugated, installed, and tuned.