Wow, what a treasure. Such a rare and distinctive set, and (CRT aside), in wonderful condition.
I see there is a schematic at
http://www.radiomuseum.org/r/sachsen...ingrad_t2.html . That would be interesting to read, but I'm not a RM member and can't download the whole thing.
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html