I'm considering a Thiersch blue capsule build with some sort of non-tube amplifier. Maybe schoeps circuit or a neumann circuit clone. Has anyone got great results with this type of thing or is it a risk?
Regarding the MT71S schematic I think I remember the late Oliver Archut wasn't too fond of it.
But not everyone agreed.
Older ones (M70 etc.) had a transformer (preferred by many), but also GDR parts that some will have mixed feelings about.
If you want to use a circuit with a transformer and sand just combine the M7 with the circuit of one channel from the USM69.
This is basically a U87 variant without the HF shelf.
Tranny could be a Haufe T14/1.
The M71s is not bad - don't believe whats spread around the web or the hearsay.
Try for yourself. I know a lot of people who favor it to a U87...