Please help identify this preamp/EQ (MEI?)

[peterc]

Hi all

I have been asked to rack some of these preamp/Eq modules and I was hoping someone here might be able to identify them.

All the info I have is what is on the PCB as shown in the pics. Anyone seen these before? Or even have a schematic?

Thx Peter

 

[analogguru]

Looks like a german DIY-build from the mid-70's. RIM-Electronic-clone comes to my mind:

https://groupdiy.com/index.php?topic=54882.0

http://www.rainers-elektronikpage.de/RADIO-RIM-Baumappen/radio-rim-baumappen.html

 

[peterc]

Thanks AG.
I am going to trace the circuit as well, will compare them.

Peter

 

[analogguru]

The pictures are not the best and the soldering too, components don't fit or are hidden therefore it is hard to say more about it.  What makes me a bit astonished are the 3 diodes in series etc., could be something like a Revox/Trident-A style pre.