Schematic for REDDi DI-Box?

[karsten21]

Hey folks,

does anybody have a schematic of the famous REDDi DI-Box?
It contains a 6N1P, a big custom made Audio-transformer, simple PSU with a toroidal transformer, gain poti and GND-Lift switch.

Some pictures shows a small simple PCB for the tube, so there seemed to me no "magic" parts or realy complicated schematic.

Yes, I know the major part for sound is the transformer; I just really interested in the tube schematic. It´s a simple Gain/CF combination or a cascode or one of these magic SRPP variants???

Thank you very much for any hints / suggestions

Best regards
Karsten