[Premium-Rx] Any info available regarding Telefunken preselectors ES 1700 and ES 150

[Heinz Breuer]

Hello,
I have both Telefunken receivers E 1800/3 and E 1800A and noticed an empty slot in the 19“ rack which indicates ES 1700 resp. ES 150. Obviously these slots are reserved for the preselectors. 

Unfortunately I don’t have any info about these, they are not covered by the main manual.

Can anybody provide any info about these modules and/or might have one available? 

vy 73 Heinz DH2FA, KM5VT

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