Groove Tube, Sterling microphones tube wiring question
« on: December 30, 2017, 12:28:12 PM »
Does anyone know why the GT/ST tube microphones use a screen connection to the B+ instead of the plate?

One of these days I will buy one to measure or build a circuit fragment to measure to figure out why they do this.
I have an idea but I am wondering what the design decision was.

The GT "The Tube Amp Book" has a section with tube microphone and a paragraph mentioning  SPA in it.