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Old 1st September 2011, 11:59 AM   #621
AndrewT is offline AndrewT  Scotland
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Josip,
if you need those answers you are in the wrong thread.
This is a new amplifier topology, in it's early days/months of development.
We have no idea where the design will end up and even more troublesome, is how variations will develop alongside.

It you want reliable build answers, look at other amplifiers that have been successfully designed and tested and proved to work. And possibly more important "productionised" to allow incompetent builders to succeed where otherwise they will fail.
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Last edited by AndrewT; 1st September 2011 at 12:05 PM.
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Old 1st September 2011, 12:00 PM   #622
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radio i think there is a misunderstand. I though you have built or on finished to built a BJT SSA version son you have yet un fonctionnel schematic with 2sc5200/sa1943...I don't have that's why i ask you for sharing yours eventualy.

Marc
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Old 1st September 2011, 12:07 PM   #623
styrkv is offline styrkv  Norway
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Hi Lazy Cat.

I will build it.
I have bought all things I need for the Electrocompaniet verson, minus trafos.
When I build the SSA frontend I will have lots of transistors to spare.
Maybe a little SSA headphoneamp with crossfeed on +-15V if I manage to scale it down.
I allso have PCBdrawings for Frontend, outputboard, voltagereg and protectioncircuit,
but Am unable to attach it to a post.
I use express PCB for drawing, and will etch myself.

Sorry for my english.
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Old 1st September 2011, 12:09 PM   #624
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Quote:
Originally Posted by AndrewT View Post
Josip,
if you need those answers you are in the wrong thread.
This is a new amplifier topology, in it's early days/months of development.
We have no idea where the design will end up and even more troublesome, is how variations will develop alongside.

It you want reliable build answers, look at other amplifiers that have been successfully designed and tested and proved to work. And possibly more important "productionised" to allow incompetent builders to succeed where otherwise they will fail.
Ok thanks i will wait for experienced builders to give their blessing
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Old 1st September 2011, 12:21 PM   #625
styrkv is offline styrkv  Norway
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The original the outputstage is taken from have 2X500VA trafos and is rated
2X120W/8 ohm ,2x200W/4ohm , 2X350W/2ohm , and stable at 1ohm.
Its a high speed, wide bandwith, low TIM amp based on Matti Ottalas findings.
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Old 1st September 2011, 01:17 PM   #626
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by styrkv View Post
The original the outputstage is taken from have 2X500VA trafos and is rated
2X120W/8 ohm ,2x200W/4ohm , 2X350W/2ohm , and stable at 1ohm.
Its a high speed, wide bandwith, low TIM amp based on Matti Ottalas findings.
That amplifier is already current limiting by 4 ohms..1 ohm stable ..?
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Old 1st September 2011, 01:34 PM   #627
styrkv is offline styrkv  Norway
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Just refering from the manual. I own one.
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Old 1st September 2011, 05:13 PM   #628
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I like this thread because of two things:
First, "two building blocks" were presented in basic topology info: SSA sym-diff CFL front-end and BIGBT output device, both very well practically tested, recognized as very stable and reliable, just what a DIY-er needs.
Second, simplicity of the SSA design is very appealing to many but just because there is no no-brainer cook-book recipe it is only available to experienced builders who knows and who dares. Like Nico in the first place, who immediately recognized benefits of the SSA design.
So the Q is, who dares next?

P.S. My current "work in progress" goes on this. I am sure that at the end, if something like that exists, there will be a few "Best of SSA" versions.

Last edited by Lazy Cat; 1st September 2011 at 05:16 PM.
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Old 1st September 2011, 05:42 PM   #629
AndrewT is offline AndrewT  Scotland
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post626,
A.W. how do you arrive at that?
200W/120W = 1.67 ratio.
350W/200W = 1.75 ratio.
These are pretty good ratios indicating that the amp can easily drive a 4ohm speaker load.

Cordell suggests a ratio when halving the load resistance of >1.8
These figures are close.
But there appears to be a bit of rounding error. I would expect the 8:4 and 4:2 ratios to be swapped around. Had the 8r0 power been ~210W then the ratios would be believable and certainly indicate adequate current capability to drive a 4ohm speaker.
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Old 1st September 2011, 07:33 PM   #630
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So i made corrections and modifications that you advise me :

Click the image to open in full size.

Marc
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