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Mission Cyrus one (Tog) Op Amp rolling

sajjad amer

sajjad amer

Active Member
I am using a Cyrus one (tog) which has developed a crackle/popping noise. It is only audible when using phono input. I have replaced all the capacitors thinking that it may be a bad capacitor, but the noise is still there. It gets louder as the volume is increased.
I am going to replace the op amps on the board next, but wonder if OPA2604 and perhaps the LM4562 can be considered as a drop-in replacement in this particular case?
The picture included is before the recap. I have replaced 1uf and 2.2uf bipolar electrolytic capacitors with wima mks2.
Any advice would be greatly appreciated.2.JPG
 
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I have changed the opamps too, still the crackling noise was there.
However, I realised that when I switch off my PC +Pioneer N50 DAC the noise disappears.
I have shared it here for the benefit of someone reading in the future, look for external sources of noise first!
 
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