I was able to come up with a photo of that “Grunt-Dig” of yours and info of it being circa 1959 and is in a
hand polished wooden case, but no schema info.



Seems to have been a West German manufacture and might have been a "creative effort" or else a knock off of another manufacturers
design.


A real super enhancing of that photo SEEMS ? to reveal the two tubes on the right to be a 6CL8, which is
a Triode-Power Tetrode, which could fill in by using the audio first amp application via the triode section and the pentode section then being the A.F. power output.


The 6AF9 is a dual pentode which could be the I.F. amp and the other section being used as the mixer for the RF front end.

That then only leaves the local osc and mixer of the FM aspect, which could be a ECH81, but I can’t make out
that preeeeeecise I.D. detail.


NONE of the / my available Grundig schematics even REMOTELY hinted of any of those aforementioned
tubes series being used in their lineup.

Soooooo, can you fill us in on those tubes numbers listed on your sets back cover ?


Also. . . . are you with an inoperative receiver, that has problems acute enough to warrant the need of a
schematic in excess of common troubleshooting ?