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In Reply to: RE: Even worse, $400.00 each posted by Cousin Billy on April 03, 2014 at 04:48:48
-Are always expensive. That's actually a great price especially given the small quantity.
FWIW if there is noise in the rectifier it will indeed be seen by both sides of the cap.
What the 4-lead parts do is bypass the internal inductance of the cap. In this way you could tie the 2 positive connections together as one, and the same for the minus side and get the benefit of the part. That of course makes one wonder why the part could not simply be made that way and just bring the resulting connection out as two terminals rather than four.
But there is another way to do this. The amp is wired in such a way as to minimize the effects of the internal wiring in the output stage- that is why there are some rather large bundles on the speaker terminals. But the speaker terminals are connected to the minus of the filter caps.
So what you could do is bypass the wiring by installing an additional pair of caps which have the negative side connected directly to the speaker terminal, then what to do with the positive side... you could connect those back to the correct connections on the filter caps...
We've done this before of course. Not a lot of effect FWIW. I don't see how the 4-lead part would help you as it does not allow you to bypass the wiring in the amp as I just described. In thinking about it I don't see the benefit of the extra leads. If you treated them as an extra terminal the current on say the positive lead would have to move through the foil, which may or may not be a good thing. If it were me doing something like that I would make two wiring harnesses to deal with the two sets of leads.
You can see that there is a diminishing return here...
Follow Ups:
Ralph, You're talking about adding capacitance right AT the speaker terminals, correct? If so, I have thought about that many times, but the problem, as you suggest, is how to connect the other end of the capacitor. It would be most convenient to connect it to the nearest positive pole, which is the pole coming from the PS on the opposite side of the circlotron. This is why I have not tried it, but is there really anything wrong with connecting to the pos of the bridged supply? I thought about using a film bypass cap right at the speaker terminals, in which case there is no polarity to worry about.
On the other hand, the internal wiring going up to the speaker terminals is very high quality and can be thought of as just another foot of speaker wire, I guess.
If you look at how the wiring is set up, you will see that while we are using something that looks like speaker cable, its not actually carrying the finished signal. Instead, that is assembled on the speaker terminals themselves, that is why the bundles from the power tubes are connected at the speaker terminals rather than at the power supplies. So the 10ga wire is simply the current return back to the power supply. The bundles going to the individual tubes are all cut to the same length. That's why the internal layout has the look that it does.
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