Noise/distorsion normal or upgrade

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Got hold of a Signat Ram 3 MK2 and its a very nice amplifier but when there is no sound input its not dead quiet but generates a little noise.
probably not power supply noise
Using no filter(switch as flat) at input and it uses old JRC2068D op amps.
Any ideas?
op amps or surrounding capacitors.
I have no scope where i am located now.

/Pelle
 
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