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I'm playing with the phono board in an old HK receiver. As the phono signal enters the board, it gets coupled to ground via a tiny ceramic cap (one each for left and right).Would like to hear the inmates' thinking -- ss that a case where the ceramic introduces distortion and I should replace with a film cap?
Thanks,
Steve.
Follow Ups:
Obviously, anything in the signal path will be a higher priority for replacing with high quality parts. However the thing causing me to do a second take on this being a filter component (presumably part of an RC with ultra low time constant)whose effects aren't even realized on signals which are necessarily inband I'm wondering if it might not be best to leave well enough alone. For example I can see AC coupling caps whose job it is to pass all important signal frequencies better be damn linear but maybe for a part like this whos only job is removing garbage from above the audio band and not touching frequencies considered part of the signal maybe quality is not as important.In fact it may be that in order to keep the filtering effects these ceramics are supposed to be giving up out of audio signal range that the relatively low ESR ceramics are required. For example an AEL of the same voltage and capacitance may have a self resonant frequency too low to do what the designer intended.
The Carver C-1 phono pre uses ceramic caps at the inputs for cartridge loading.Bob Carver selected those for some reason.
In this preamp, I might upgrade every op amp and re-do the whole power supply, but I have no desire to replace these ceramic caps.
Best regards,
CAC
Hi.Like quite few brandname phono & power amps used ceramic caps, I used them too in my tube & SS phonostages & power amps, but only HV grade (3KV) for I/P jacket HF decouple grounding.
Low voltage rated ceramic caps are not linear at all but only HV rated are pretty linear.
c-J
Whadayaknow! All the ceramic caps in the Carver phono stage are rated at 1KV. I will keep that in mind if I decide to go in there and fuss around again. You learn something new every day!Thanks,
CAC
Hi.Quite some audio amp designs use ceramic caps as decoupling caps to drain off any HF noises at the I/P electrical neutral ground point to the chassis.
Where you get the idea & how ceramic caps would cause more distortion than other types of caps?
c-J
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