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Old 13th August 2012, 08:32 PM   #1011
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It's my fault. I'm sorry, didn't mean to make a trash in F-5 thread..It just jumped from one word bout PSU to another, and here we are..
Sorry again guys, You've helped me enough to stop bothering You for a while:-)
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Old 13th August 2012, 08:32 PM   #1012
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Quote:
Originally Posted by Tehtoril View Post
Thanks for keeping that in mind, guys
So You say, that I should buy 4 bridges?
Wich one would be the best for that job?
yes. dual rectifiers is the best way to go.
regarding what knd, there can be a one year discusion
for a class A amp, i like the classic bridge. the super fast soft recovery diodes dont make theyr wow factor in class A amps.
some svear to them. but with more or less constant current draw, the standar brigde will do the job. it works for nelson too
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Old 13th August 2012, 11:58 PM   #1013
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Originally Posted by AudioSan View Post
russ. i also went for external rectifiers. in form of bridges. dual bridge pr rail, on chipamps PSU board.
Nice. What type rectifiers did you use? I've got another F-5 I'm building, no limiting circuitry and higher gain, and have a growing pile of parts for a turbo version. I'm convinced there are differences in rectifiers sound and am always interested to know what others are using, and wouldnt mind experimenting. I've seen some FRED bridges, (one piece, I think Vishay makes that sure look easy to use!

I took Peter Daniels recommendation at the time to use the IRF mosfets as well as the MUR diodes. I'm sure other high quality rectifiers sound good too,
Its just that my only F-5 build used them, so that's what Im familiar with.

Russellc
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Old 14th August 2012, 09:33 AM   #1014
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russ. i used standar 35A 600V bridges.
i'm alsso getting a groving pile of parts for the turbo
i think that the caps make more difference then the diodes in this sort of amp.
at least regarding to price. good diodes cost easy 10 times as much standar bridges
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Old 14th August 2012, 11:59 AM   #1015
AndrewT is offline AndrewT  Scotland
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I go along with Audio San in using ordinary bridge rectifiers.
I add on R+C snubbers, never C alone.
For ClassA the rectifiers need heatsinks.
In monoblocks I cannot hear, nor measure any difference between single bridge on a CT secondary or dual bridge on a dual secondary.
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Old 14th August 2012, 01:05 PM   #1016
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there is less stres on the bridges if you use dual bridges
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Old 14th August 2012, 01:29 PM   #1017
AndrewT is offline AndrewT  Scotland
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Is there?
Why?
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Old 14th August 2012, 01:39 PM   #1018
6L6 is offline 6L6  United States
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Quote:
Originally Posted by AudioSan View Post
there is less stres on the bridges if you use dual bridges
With a dual bridge there is less stress on the transformer if (and only when) the rails sag independently from each other. With a single bridge, the transformer secondaries take the asymmetrical load, and can hum a bit.

This is not that big of a deal in a Class-A amp, and the Pass Aleph amps were made with single bridges.

Last edited by 6L6; 14th August 2012 at 01:50 PM.
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Old 14th August 2012, 01:44 PM   #1019
Zen Mod is offline Zen Mod  Serbia
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exactly
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Old 14th August 2012, 01:55 PM   #1020
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Originally Posted by AndrewT View Post
Is there?
Why?
the bridges share the load
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