Converting a D-87 to ORS87

[jp8]

Thank you @jp8, you are a wizard! I love learning more about all of this and I will definitely do some experimenting with the circuit in LTspice.

I hope others will find it useful too!

Here's a quick audio sample featuring this ORS87, my Fuchs U87A build, and my modded AKG P420:
View attachment 144169

Components of these mics:
ORS87: JLI TSC-2 capsule with 3U Audio GZT-87 Transformer in an Aurycle A460 donor body
Fuchs U87A: Arienne Audio K87 capsule (v1) with 3U Audio GZT-87 Transformer in the AliExpress HL-95 mic body
AKG P420: Modded with a 470pF MLCC tacked on to the existing 220pF surface mount cap (690pF total)

I'm mostly interested in using this mic potentially as a vocal mic for music, but it'll be interesting to see how it does with acoustic instruments and other sources.

Thanks to all for helping me think through the change and teaching me more about how the circuit works!

I had a slight preference for the P420. It sounded a bit more detailed to me. But all are great mics now!