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.
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.
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It sounds like you've done a good job of localizing the problem. You didn't mention, but is the noise on one channel only?
The NE55534 opamps are good are good performers--- I'd stay with them. But the opamp is a possible suspect.
Does the MM/MC (SW1) switch "feel" erratic? Give the switch a thorough exercise with contact cleaner. Prod circuit with a wooden chopstick or similar to see if there's any mechanical susceptibility. Maybe apply a bit of flux to solder joints and reflow. After due diligence, try opamp replacement. You could add a socket if you wish to experiment.
Good luck!
The NE55534 opamps are good are good performers--- I'd stay with them. But the opamp is a possible suspect.
Does the MM/MC (SW1) switch "feel" erratic? Give the switch a thorough exercise with contact cleaner. Prod circuit with a wooden chopstick or similar to see if there's any mechanical susceptibility. Maybe apply a bit of flux to solder joints and reflow. After due diligence, try opamp replacement. You could add a socket if you wish to experiment.
Good luck!
Thank you for your reply.
The noise is on both channels, worse on right. Perhaps I did not clean the MM/MC switch properly.
I will report back my findings, once sorted.
The noise is on both channels, worse on right. Perhaps I did not clean the MM/MC switch properly.
I will report back my findings, once sorted.
