The T9K39 had 12 tubes.
The quality of its parts and assembly was rated as "very well constructed" by Allied examiners after the war.
Ant. Kopplg. = antenna coupling
Ant. Umschalter = antenna switch
Aus = off
ohne Regelung = without control
Kopfhorer = headphones
Oberlagerungsempfanger = heterodyne receiver
Photo by Bruce Culp
Photo by permission of Stg.C.D.V.&T.