Help for Revox B739

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Hi,

I bought a dead B739 on a flea market for very cheap and one of the problems is, there is a small long pcb in the tuner part ( on the right side if you sit in front of the B739 that contains 3 metal case op amps and should contain one IF (?) filter. From this pcb also goes the two shielded cables to the delay line (?)

This filter is missing. :bawling:

Anybody knows which one has to be there ?

Also the op amp in the middle gets very warm.

I put a IF filter from a Marantz receiver there and now I get a silent pink noise which is better than before because there was only very silent hum.
 
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