Looking for info on RCL Electronic CV523 module

I recently bought this RCL Electronic CV523 module. The tubes that came with it are EF86, ECC81 and E283CC.

I can't find any information on it, except for this: pandcampkit

This is what I could find about RCL Electronic:
- RCL SPRING REVERB- RARE | mark's Gear Outlet | Reverb
- Echoschall – Bibliothek: Studio Magazin 1983-06 | Heft 62 - Seite 32-33

Perhaps someone knows what they are exactly? And even has a schematic of it? Else I have to draw up the schematic myself (which would bring some diy in the picture).

Thanks.

Addition: There are two transformers on it (not included what could be inside the metal box on the left and not included the relais), so probably one is for microphone input and the other for line out.
 

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