By DjDiskmachine
Sat Jan 05, 2019 4:54 pm
Yo!
Bad luck you managed to pinch the cable, I recommend shrinkwrap or electrical tape to fix that!
Hmm what caps did you replace again? I'm not having any problems with my inputs, they used to have a bad noise problem but now they are pretty much transparent.
I can't see any evidence that the line in caps should need replacement, the ones I see in the Service Manual are only there for DC blocking and perform no filtering.
The line in circuitry uses a different OP amp than the outputs (IC19 as opposed to IC11 for outs). It uses the same rail (5V) as the one supplying the output amplification circuitry. Are you sure you replaced all the caps? Are you sure you got the right values in the right place?
The only thing different between the input OP and the output OP is they have their own cap for HF filtering (on the input OP that's C46, seen way at the bottom right of the last page in the Service Manual).
This doesn't seem like a likely cause of the problem to me, but can't be ruled out of course since I can't perform any measurements
This sentence got my attention now when I read your post again, can you elaborate, please?
Do you mean that the noise is supressed, like when doing compression -eg the louder sound "pushes" the quieter noise down then the noise is louder again after the sound stops playing?
/M
Bad luck you managed to pinch the cable, I recommend shrinkwrap or electrical tape to fix that!
Hmm what caps did you replace again? I'm not having any problems with my inputs, they used to have a bad noise problem but now they are pretty much transparent.
I can't see any evidence that the line in caps should need replacement, the ones I see in the Service Manual are only there for DC blocking and perform no filtering.
The line in circuitry uses a different OP amp than the outputs (IC19 as opposed to IC11 for outs). It uses the same rail (5V) as the one supplying the output amplification circuitry. Are you sure you replaced all the caps? Are you sure you got the right values in the right place?
The only thing different between the input OP and the output OP is they have their own cap for HF filtering (on the input OP that's C46, seen way at the bottom right of the last page in the Service Manual).
This doesn't seem like a likely cause of the problem to me, but can't be ruled out of course since I can't perform any measurements
This sentence got my attention now when I read your post again, can you elaborate, please?
NearTao wrote:"If a sound is playing it is okay and the noise floor seems to cut out"
Do you mean that the noise is supressed, like when doing compression -eg the louder sound "pushes" the quieter noise down then the noise is louder again after the sound stops playing?
/M