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Old 14th August 2012, 02:06 PM   #1021
AndrewT is offline AndrewT  Scotland
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The bridges pass the same current for the same amount of time.
Witness the doubled heat dissipation compared to a single bridge. Both arrangements dissipate the same heat per bridge.
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Old 14th August 2012, 02:14 PM   #1022
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by 6L6 View Post
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.
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exactly
possible DC through secondaries is a main thing , when rails are not symmetrically loaded
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Old 14th August 2012, 05:01 PM   #1023
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Very interesting AndrewT and Audiosan...in the next build it would be easy (and inexpensive) to try some regular rectifiers, I could always "upgrade" later if it proves necessary.

Andrew, is there a formula or rule concerning the values of the cap/resistor
snubbers you speak of? What values for this in F-5?

Thanks in advance,

Russellc
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Old 14th August 2012, 05:05 PM   #1024
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Quote:
Originally Posted by 6L6 View Post

This is not that big of a deal in a Class-A amp, and the Pass Aleph amps were made with single bridges.
I have noticed that on some schematics of his, perhaps one of the alephs? I'm sure Nelson has tried it everywhich way!!!

PS: Sorry 6L6, I see you mentioned the Alephs as an example...

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Old 14th August 2012, 05:35 PM   #1025
AndrewT is offline AndrewT  Scotland
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Originally Posted by Russellc View Post
............... is there a formula or rule concerning the values of the cap/resistor
snubbers you speak of? What values for this in F-5?.............
yes, is it Hagerman?
There is a lot more discussion on R+C snubbing going on in recent postings than there has been over the past few years. Worth digging into these Threads.
The important point is that the R does the damping.
The C stops the low value of the R blowing up due to excess dissipation.
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Old 14th August 2012, 08:06 PM   #1026
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Quote:
Originally Posted by AndrewT View Post
yes, is it Hagerman?
There is a lot more discussion on R+C snubbing going on in recent postings than there has been over the past few years. Worth digging into these Threads.
The important point is that the R does the damping.
The C stops the low value of the R blowing up due to excess dissipation.
Oh, sorry, I thought you had tried this with an F-5 already!

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Old 17th August 2012, 04:03 AM   #1027
hangguy is offline hangguy  United States
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I was using a couple general purpose GBPC-3510 for my F5 build. Recently, I decided to change them out and use 8 pcs of MUR3060 to make up the rectifier. This change brought some noticeable improvements over the GBPC-3510. The most apparent are the detail levels improvement and the image solidity. For the $30 I paid for the MUR3060, this is a very worthwhile upgrade for any F5 builds.
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Old 17th August 2012, 09:15 AM   #1028
AndrewT is offline AndrewT  Scotland
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Russel,
why are you "sorry"?
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Old 17th August 2012, 02:14 PM   #1029
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by hangguy View Post
I was using a couple general purpose GBPC-3510 for my F5 build. Recently, I decided to change them out and use 8 pcs of MUR3060 to make up the rectifier. This change brought some noticeable improvements over the GBPC-3510. The most apparent are the detail levels improvement and the image solidity. For the $30 I paid for the MUR3060, this is a very worthwhile upgrade for any F5 builds.
Did you do any matching ?

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Russel,

why are you "sorry"?
Sounds like sarcasm Andrew ..... !
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Old 17th August 2012, 02:59 PM   #1030
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No, not at all, I thought he was saying this because he had done it this way in an F-5's power supply. That's why I inquired about the values. Apparently
this is not the case just a statement that typically he uses the snubbers. Why what are you trying to make of it?

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