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In Reply to: RE: Great discussion, guys.... posted by Tre' on September 13, 2016 at 18:32:01
Driven by an AC supply, a capacitor will only accumulate a limited amount of charge before the potential difference changes sign and the charge dissipates. The higher the frequency, the less charge will accumulate and the smaller the opposition to the current, therefore; higher frequencies MAY improve with a larger value capacitor in that position.
The Mind has No Firewall~ U.S. Army War College.
Follow Ups:
Yes, the reactance of a larger cap is lower than the reactance of a smaller cap.In this application that would make a better connection to ground at all frequencies (not just the higher frequencies) for the screen grid.
If it is the case that the OP replaced a 2.8uf cap with a 4.7uf cap and then reported that he heard a difference, then that would be completely understandable.
On the other hand if the original poster had already changed (at a previous time) the 2.8uf for a 4.7uf (or built the amp with a 4.7uf to start with) and is not reporting on that change in sound but is reporting on a change in sound having do to with the modified leads on the 4.7uf, he might be fooling himself (through expectation bias or whatever) and some proof of a real change in the sound will need to be proven through a DBT or a better explanation of the science involved.
Update; in the post linked below the OP has confirmed that he is indeed reporting that the perceived change in sound was between a 4.7uf without the leads modified and the same 4.7uf cap with the leads modified.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 09/14/16
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The Mind has No Firewall~ U.S. Army War College.
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