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Old 13th September 2012, 11:24 AM   #1761
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F4 is

BA2 PP OS (also useful for BA3)
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Old 13th September 2012, 11:28 AM   #1762
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Why dual TL over single(like f4/ba2 output). Better control. Perhaps stupid question. Why would TL outperform ccs loaded LED?
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Old 13th September 2012, 11:35 AM   #1763
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Quote:
Originally Posted by lhquam View Post
Since my amplifier power needs are happily satisfied with less than 25W, I have no real interest in spending (wasting) time of Class-AB circuits.
IMHO, the challenge will be to operate Conceptual F6 and its variants in Class A/B or even Class B modes and still make great sounding amps. I'll do it when the diy PCB by Mr. Pass becomes available for sale.
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Old 13th September 2012, 11:46 AM   #1764
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Antoinel, just about every major amp manufacturer i know of tries to maintain class A as much as heat allows. There is really no doubt it improves performance. A/b is perfectly viable above low power levels, but you can keep it for anything else, IMO.
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Old 13th September 2012, 12:19 PM   #1765
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Quote:
Originally Posted by buzzforb View Post
Antoinel, just about every major amp manufacturer i know of tries to maintain class A as much as heat allows. There is really no doubt it improves performance. A/b is perfectly viable above low power levels, but you can keep it for anything else, IMO.
Please count me in for PCB, parts and semis to assemble Conceptual F6 as you make them available..
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Old 13th September 2012, 12:26 PM   #1766
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Quote:
Originally Posted by buzzforb View Post
Why dual TL over single(like f4/ba2 output). Better control. Perhaps stupid question. Why would TL outperform ccs loaded LED?
dual vs. single because you need two bias nets

TL will not outperform LED,diode or zenner based bias net

in fact , appropriate tempco will win stability wise but soundwise there will not be difference
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Old 13th September 2012, 12:58 PM   #1767
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Quote:
Originally Posted by Nelson Pass View Post
ZM has been nagging me for information on the F6. I have a very nice
sounding prototype, but the design and the article that accompanies it
have some details remaining.

However, I can afford to put out this teaser:

Buzzforb Mentioned something..

Sorry for taken the first post and quote on, but.....

looks like it can use a pulse transformer buti would suspect a ratio 1:10:10 -> 1:100:100???


Am i right???
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Old 13th September 2012, 01:48 PM   #1768
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pulse xformer is certainly not adequate

those are for switching duties

whatever - define - are you asking about 1:10 , or about 1:100 xformers ?
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Old 13th September 2012, 01:56 PM   #1769
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Quote:
Originally Posted by Zen Mod View Post
pulse xformer is certainly not adequate

those are for switching duties

whatever - define - are you asking about 1:10 , or about 1:100 xformers ?
Thats the ration of the transformer. This would give you system gain.

But you are correct. And the transformer will never be saturated....
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Old 13th September 2012, 02:06 PM   #1770
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too much gain , so too much feedback then
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