German? amp help please

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been given this amp to fix/restore braned on front as "SU PREM" telefunken and siemens valves + speakers made in Dortmund. power amp has El34's push pull superlinener i think, this bit works ok.
but the pre amp has really been messed with if anyone can identify this amp or has a schematic that would be really cool other wise I'll hav to do it the hard way and figure it out from whats still original on each Chanel any help suggestions or comments wellcome
 

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