German amp, preamp. Anyone recognize?

[alhe]

These are VEB / RFT amps. Do anyone recognize these, and what are they - Line amps, preamps, for studio, hifi?

Note there's several pots on the front panel, but these are small and operated by a screw driver. I am not sure what they all do, but  seems to be a dual or stereo set up. 

 

[[silent:arts]]

Amplifiers for Tape-Machines. Useless for other purposes.

 

[alhe]

Of course, why didn't I think of that. Thank you 

So my best bet is to gut them, see if I can use the transformers and psu for a project.