NAD 4020 Tuner

I have the service manual scanned, but not made into a distributable format yet... but here is the tuner string diagram (if this isn't big enuff mail me and i can send the full size snapshot)

dave
 

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Hi Dave,
I am new owner of NAD3020 and 4020B tuner.
As you probably have seen I "repaired" 3020 ;-)
Today I powered on 4020B and... no stereo effect, but beautiful analog sound.
I have got the schematics of A version but the resolution is filthy, could you upload the schematic for B version or advice where should I look for fix stereo decoder?
Thank you in advance!
PS. the inside of the tuner was sealed - no dust inside, the parts look like the are straight from the factory, even smells like new.