Rerurn to Romy the Cat's Site


In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: The stupid 5uF cap on AC sidePosted by Romy the Cat on: 9/2/2011
fiogf49gjkf0d
 N-set wrote:
(feel free to re/move this post to the electricity thread)
As the power supply I'd regard everything from the power generator in the power plant down to the actual load.
Why the power transformer should be the cutting line?
I do hear your voice clearly re "common sense". What my stupid brain refuses to understand however
is how comes that the rectifiers, chokes, and other PS crap is invisible but a stupid 5u cap in the main line
does make a difference?  If the signal feels it it means the load is not truly isolated for whatever reason?
Or am I a complete idiot (very probable)? I don't expect concrete answers, I'm just wondering loud.
BTW I did not of course connect the earth of the filters exactly to avoid those caps from lines to earth.
I also tried to look at the filter chcracteristics, but I'd rather look into tarot cards...

I do not say that rectifiers, chokes, and other PS crap are invisible. We do not have ways to abstract tier visibility out of experiments. We can use other rectifiers, chokes, and other PS craps but we can’t not drive PS without them. The last filtering caps do minimize the difference between rectifiers, chokes, and filtering craps. Otherwise you can use your 300B amps with typical 8uF of filtering crap in B+ and then writhe long posts at DIYaudio.com site about different lamination of your choke if different tube socket on your rectifier “dramatically” changes the sound of your amp.
The stupid 5uF cap on primary is very different than anything else. The rectifiers, chokes, and caps of PS are DC polarized. They deal with ripples but the dialectics are charge with DC. A cap in put AC has no biased dielectric and as a result all dielectrics are vibrating (they are dielectrics but they are partially chargeable) and smear the termination of transmission line. I do not insist that that is THE reason but this is the ONLY explanation I have.  I do not know why by caps on AC side do not work. Take an air or vacuum cap with no dielectric and you will not have problem with sound on AC side. I do not really dig the reason for all of it as it truly not really fascinates me. I did discover that cap on AC side is problem and I use this knowledge, rather then explaining it. Feel free to conduct your own experiment and find the explanation of the results.

The Cat

Rerurn to Romy the Cat's Site