Hi,
I build different microphone projects, and using a scope on them is more straight forward on some circuits than others.
My latest build is an M49 tube mic (schematic attached). The build went great, and there aren't any issues with the circuit, but I'd like to be able to get useful information out of my oscilloscope. I thought I would be able to see some differences while adjusting the value of R7 (my build has a 5k pot instead of the 2.2k resistor in the schematic). However, inserting my scope around C5, or the input or output of the transformer all gave a consistent sine wave without any change while adjusting R7.
My guess is I'm measuring the wrong thing, or wrong area, or just wasting my time.

Anybody experienced with using a scope on a microphone have any tips? Even general info when scoping mic circuits would be helpful.
Thanks,
Josh