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Old 23rd May 2012, 09:37 PM   #271
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by gl View Post
Hi 6L6,

I'm not sure I'd agree. I think the diode thing has become larger than life because of this forum.

What I get from reading the article is Nelson offering the widest variety of choices for hopping up the F5 - different power levels, different topologies, and different costs to the widest group of people. Lots of options, lots of choices, right to the of the article.
I agree, just multiple outputs, higher voltage and cascading will bring you to higher wattage places.
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Old 6th June 2012, 05:12 PM   #272
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Mr. Pass wrote in his article on power supplies in 2001 that he likes slow rectifiers bypassed by small capacitors. Has he changed his mind since then? Anybody know what he uses in his commercial offerings?
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Old 6th June 2012, 05:35 PM   #273
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high speed diode to-220 package for Aleph-x

Paps hasn't mentioned yet what they're using currently.
(MUR3020W is a likely candidate)
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Old 6th June 2012, 05:46 PM   #274
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I agree, just multiple outputs, higher voltage and cascading will bring you to higher wattage places.
I have come to believe that Nelson is a pretty calculated and thoughtful guy and that nothing he does is without purpose. I think the purpse of the F5T was spelled out in the article and in the same article Nelson states the improvement he believes comes from the addition of the diodes. No doubt it has been blown out of proportion, but then again, how many people even fully understand what is going on with the diodes. I think i do, but I am not 100% sure. EIther way, it is a clever trick for more transient power and that is a prcatically useful thing for most modern multiway speakers. You also have the ability to expand an idea beyond a presented concept. Consider all th past info he has released. If clever enough, you could have assmbled something very close to his commercial offerings. Of course they would not be the same and he has held back some things, but I believe if you ask folks who know him personally, they could tell you stuff that would blow your mind about his approach and intuitive planning in all that he does. i have heard rumours tha even his filing system is a bit revelatory. Folklore? Legend? Who knows. Here we are talking about
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Old 6th June 2012, 06:11 PM   #275
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So why Dutchie don't like the diodes ...?
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Old 6th June 2012, 06:13 PM   #276
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Mr. Pass wrote in his article on power supplies in 2001 that he likes slow rectifiers bypassed by small capacitors. Has he changed his mind since then? Anybody know what he uses in his commercial offerings?

Based on the photos on the 6moons review it looks to me like First Watt selected PC grade Electrolytic caps for the PSU in the F5 however in the Pass Labs amps that shade of blue looks like high quality and very large Vishay caps for the PSU. No doubt someone is going to correct my assumptions ;-)
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Old 6th June 2012, 06:25 PM   #277
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Originally Posted by a.wayne View Post
So why don't like the diodes
Guess

Pumpkin preamp - ordered by Steen , official making thread

Byw99w-200
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Old 7th June 2012, 02:00 AM   #278
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Sir Buzzforb, I am sorry if I left doubt as to which rectifiers I was asking about. I was speaking strictly about the power supply. The little bypass caps are to attenuate the switching noise I think. More capacitance in the banks is always a good thing. I am building the F5T V3 exactly as drawn, account he's the engineer. I am only the lowly Conductor.
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Old 7th June 2012, 04:13 PM   #279
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I find it very noteworthy that the 6moons review places the F5 right up in the top tier knowing that all the parts are very ordinary, albeit quality components, that came straight out of the bin at places like Digikey and Mouser etc.

There isn't a single example of anything like unobtainium based this or cryogenic that or oxygen-free single crystal whatever. And the rectifier bridges and main PS filter caps referred to above really aren't anything special.

But the F5 stands there; ranked with other best of breed tube and SS amps.

Very cool.

Kind of cuts through the you-know-what and gives an ordinary body hope.

Last edited by gl; 7th June 2012 at 04:21 PM.
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Old 7th June 2012, 09:33 PM   #280
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yes it's awsome
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