Red 5 Audio RV6

[gary o]

Anyone know what circuit this is seems to have 4 transistors and FET , please see photo

 

[Khron]

The "G1"-marked transistor next to those two green-bodied inductors is likely an NPN transistor comprising a Schoeps-like oscillator for generating the capsule bias voltage.

The "2L" ones i would reckon are a pair of PNP's, with those diodes between collector and emitter, once again very Schoeps-like.

The TO92-package will likely be the JFET, but that "2BL"(?) marked transistor with those 4.7k resistors on both sides acts as a phase-splitter. This arrangement is nearly identical to what's in the BM700 / BM800 microphones, minus the discrete zener+NPN regulator.

https://audioimprov.com/AudioImprov/Mics/Entries/2015/12/20_Modding_a_BM-800_Mic.html

 

[rock soderstrom]

Modified Schoeps circuit?

Edit: Khron was faster

 

[gary o]

Thanks for the the observations, Seems decent for a cheap mic, there 3 220u caps on rear of board & couple decent looking 1 gig resistors.... its sounds great with a tim cambell capsule.

 

[gary o]

Khron thanks for BM800 link that was a way better BM 800 than I got