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Old 6th June 2011, 11:17 PM   #1
ChPuls is offline ChPuls  Germany
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Default Has anybody Burmester or AVM schematics?

Hello,

Has anybody Burmester or AVM amp schematics?
I am already experienced in building top loudspeaker. Now I would like to know more about top amps. It would be interesting to see some burmester or avm schematics and to learn from it.
Can somebody help me?
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Old 7th June 2011, 06:44 AM   #2
h_a is offline h_a  Europe
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I remember a Burmester phono stage circuit floating around, however, I wasn't that impressed.

Maybe you would like to have a look at Nelsons designs (F5) or John Curls JC-3 or maybe Krells KSA50 just to name a few popular ones.

Hannes
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Old 7th June 2011, 02:31 PM   #3
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Quote:
Originally Posted by ChPuls View Post
Hello,

Has anybody Burmester or AVM amp schematics?
I am already experienced in building top loudspeaker. Now I would like to know more about top amps. It would be interesting to see some burmester or avm schematics and to learn from it.
Can somebody help me?
In the German test magazine "Stereoplay" was a very detailled description from a diy amplifier. The author was Mr. Günter Mania. He founded the German audio company "AVM".
Check out this thread for more informations:
stereoplay 1988 Monoblock from Günter Mania.

I wonder, that nobody have carried out a reverse engineering of Burmester's power amplifier.

If you want to get best sounded amplifiers, use Class-A and go to the websites from passlabs.com. Here you will find "easy-to build" topologies for getting best results. Unfortunately not suited, if you only like "low cost" solutions.

My favorite solution is a multi-amping mode, in case of a two-way loudspeaker system an ordinary Class-AB for the low frequency aera (e. g. the "Blameless" topology from D.Self) and for the high frequency aera the "ZEN"-topology from Mr. Nelson Pass.

Last edited by tiefbassuebertr; 7th June 2011 at 02:39 PM.
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Old 7th June 2011, 02:45 PM   #4
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1987/1988 article series schematic included a 5534 input stage.(this page copy is from the web, not a xerox from my Stereoplay mags, me build with original RCA FETs)
Later commercial model upgrade included a switch to BB OPA627.
Take note that the commercial stuff did have source resistors.

(Burmester gear has been copied as far back as the late 70s. )
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File Type: jpg AVM besch3im9.jpg (255.4 KB, 730 views)
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Last edited by jacco vermeulen; 7th June 2011 at 02:52 PM.
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Old 7th June 2011, 11:31 PM   #5
ChPuls is offline ChPuls  Germany
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Thank you all.
I wonder also, that nobody has backengineered Burmester!
I have already Pass Schematics.
Thorens Circlotron power amplifier TEM-3200 would be interesting, too!
What about the Thorens TEM-3200 ?

Last edited by ChPuls; 7th June 2011 at 11:53 PM.
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Old 8th June 2011, 08:33 AM   #6
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The Circlotron topology is one of my favorite design. Unfortunately there are very few commercial brands on the marked, where this topology is in use:
CSPP/Cirlotron - Brand Names of Commercial Solid State Amplifiers
Good known brands by solid state versions was SUMO and as new product Thorens, as you also note.
For DIY this site is interesting:
http://www.susan-parker.co.uk/zeus.htm
and the associated thread here:
Zero Feedback Impedance Amplifiers
The power amp with lowest possible active devices in the signal path !!!
Quote:
Originally Posted by jacco vermeulen View Post
1987/1988 article series schematic included a 5534 input stage.(this page copy is from the web, not a xerox from my Stereoplay mags, me build with original RCA FETs)
Later commercial model upgrade included a switch to BB OPA627.
Take note that the commercial stuff did have source resistors.

(Burmester gear has been copied as far back as the late 70s. )
Thank you for posting this schematic. I like this topology, because there is only one VAS stage in the signal path and thus no Cdom is necessary.

Last edited by tiefbassuebertr; 8th June 2011 at 08:39 AM.
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Old 9th June 2011, 12:18 AM   #7
ChPuls is offline ChPuls  Germany
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My title "Has anybody Burmester or AVM schematics" is grammatically wrong. The title should be "Does anybody has Burmester or AVM schematics"! I was so confused. Can a moderator change this? Is it the reason why no native english speaking person is answering?
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Old 9th June 2011, 02:07 AM   #8
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Quote:
Originally Posted by tiefbassuebertr View Post
Zero Feedback Impedance Amplifiers
The power amp with lowest possible active devices in the signal path !!!
I count two, which is twice the minimum.

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Old 9th June 2011, 03:18 PM   #9
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Originally Posted by ChPuls View Post
My title "Has anybody Burmester or AVM schematics" is grammatically wrong. The title should be "Does anybody has Burmester or AVM schematics"! I was so confused. Can a moderator change this? Is it the reason why no native english speaking person is answering?
Grammatically wrong again.

It should be "Does anybody have Burmester or AVM schematics ?"
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Old 11th June 2011, 11:48 PM   #10
ChPuls is offline ChPuls  Germany
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The Thorens Circlotron TEM 3200 is interesting. It is totally DC-coupled, has tubes in the driving stage for higher characteristic curve or gain and it has only one trimmer to set the operating point for the output transistors. The output transisors are power hexfets. They were tested in Stereoplay December 2005 I think. Here is the test of Stereoplay in german with an simplified schematic:
Thorens TEM 3200 - Stereoplay
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Last edited by ChPuls; 11th June 2011 at 11:56 PM.
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