grundig: 2070; Hifi Zauberklang

Hi together,

recently i got a Zauberklang 2070. After some minor restoration its up an working quite nicely. One thing is puzzling me thought: What is a "HIFI-Strahler", does anyone has information about it, e.g. schematits ?!
apart for some models here i found this in the web...

But which model could be used for a 2070 !?

any information would be appreciated
best regards
Helmar

Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.