Power Amplifier with only one Multichannel Transistor from Brain Audio - Schematic ?
Unfortunately very few informations on the web (only in German):
Information uber Endstufe "Brain Audio" gesucht - Verstarker, Lautsprecher, Zubehor - Analogue Audio Association
under
ITM praktiker - Leseprobe: Brain Audio: Multikanal-Transistor - praktiker verlag
I read follow:
Erster Verstärker mit Multikanal-Transistor (first power amp with multichannel transistor in use) von Brain Audio
Hier die technischen Eckdaten des ersten Verstärkers von Brain Audio mit dem neuen Multikanal-Transistor (der endgültige Name ist noch geheim)
(here the short form data of this amp from brian audio with the brand new multichannel transistor in use - the final naming was still confidental)
Ein einziger Transistor (only a single transistor)
1200 Watt sinus an 8 Ohm (output power)
Wirkungsgrad (efficiency) >95%
Ruhegeräuschspannungsabstand (SNR) >140dB
Frequenzgang (frequency response) 1 Hz bis 4 MHz ±0,5 dB
Keine Transformatoren (no transformers)
Keine Siebkondensatoren (no smoothing/filter caps)
Keine Kühlkörper (no heatsink)
Thanks for upload schematics.
There was also a two way loudspeaker available at those days from the same brand:
BRAIN AUDIO Acoustics . . Wer kann mir was zu den Lautsprechern sagen, Lautsprecher - HIFI-FORUM
Unfortunately very few informations on the web (only in German):
Information uber Endstufe "Brain Audio" gesucht - Verstarker, Lautsprecher, Zubehor - Analogue Audio Association
under
ITM praktiker - Leseprobe: Brain Audio: Multikanal-Transistor - praktiker verlag
I read follow:
Erster Verstärker mit Multikanal-Transistor (first power amp with multichannel transistor in use) von Brain Audio
Hier die technischen Eckdaten des ersten Verstärkers von Brain Audio mit dem neuen Multikanal-Transistor (der endgültige Name ist noch geheim)
(here the short form data of this amp from brian audio with the brand new multichannel transistor in use - the final naming was still confidental)
Ein einziger Transistor (only a single transistor)
1200 Watt sinus an 8 Ohm (output power)
Wirkungsgrad (efficiency) >95%
Ruhegeräuschspannungsabstand (SNR) >140dB
Frequenzgang (frequency response) 1 Hz bis 4 MHz ±0,5 dB
Keine Transformatoren (no transformers)
Keine Siebkondensatoren (no smoothing/filter caps)
Keine Kühlkörper (no heatsink)
Thanks for upload schematics.
There was also a two way loudspeaker available at those days from the same brand:
BRAIN AUDIO Acoustics . . Wer kann mir was zu den Lautsprechern sagen, Lautsprecher - HIFI-FORUM
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One transistor, allmost no cooling, 1200W out . Some transistor 
But this is not allowed on this forum
"Aufgrund seiner Ausführung konnte auch das Biasproblem gelöst werden. Es gibt keinen Bias mehr,
denn der neue Transistor ist so stabil und die P-Schichten aber so sensibel,
dass direkt mit Netzspannung gearbeitet werden kann. Also: Kein Transformator mehr."
Mona
But this is not allowed on this forum
"Aufgrund seiner Ausführung konnte auch das Biasproblem gelöst werden. Es gibt keinen Bias mehr,
denn der neue Transistor ist so stabil und die P-Schichten aber so sensibel,
dass direkt mit Netzspannung gearbeitet werden kann. Also: Kein Transformator mehr."
Mona
"Due to its execution also the bias problem could be solved. There is no bias, because the new transistor is so stable and the P-layers but so sensitive that you can work directly with mains voltage. So: no more transformers"
Direct mains, no transformers? 😱
Direct mains, no transformers? 😱
Hier zwei Fotos aus dem Inneren einer "Brain Audio" Endstufe.
Aus einem recht kleinen Ringkerntransformator wird ein ver-
gossenes Modul von ca. 10 x 12 cm gespeist. Es sind lediglich
vier 25-Volt Elkos erkennbar. Trotz Brückenschaltung beträgt
die Ausgangsleistung nur etwa 15 W pro Kanal.
Obviously BS, not worth any investigations
Despite German description about no transformer and direct connection to mains voltage, photos show potted torus transformer and 4 capacitors - conventional power supply.
1200W output is very questionable.
1200W output is very questionable.
Due to the fact that this particular amp was a home made ripoff I suspect a small quantity.
A German company that in the early 90s was engaged in the production of high-performance boxes, and later - in the research of multichannel transistor amplifiers. Dr. Christian Schmid, owner, probably died in 1998.😱
"Because of its implementation, the bias problem could also be solved. There is no longer any bias,One transistor, allmost no cooling, 1200W out . Some transistor
But this is not allowed on this forum
"Aufgrund seiner Ausführung konnte auch das Biasproblem gelöst werden. Es gibt keinen Bias mehr,
denn der neue Transistor ist so stabil und die P-Schichten aber so sensibel,
dass direkt mit Netzspannung gearbeitet werden kann. Also: Kein Transformator mehr."
Mona
because the new transistor is so stable and the P-layers are so sensitive,
that you can work directly with mains voltage. So: no more transformers. "
Mona (Google translation)
Allegedly, at the end of 1997, Brain Audio was in patent negotiations and discussions with a large manufacturer of semiconductor components. Then we were told that the inventor had leukemia. In any case, by the end of 1997 he could no longer be found by us.
Addendum in mid-2009: Since this report is apparently linked from several pages and there are repeated inquiries after its removal, it was made available again. The problem with this is that in the end it didn't get around to getting a test copy. Just a few weeks after the presentation at IFA Berlin, the developer was no longer available. He is said to have passed away soon afterwards, as we had heard rumors from several quarters. It is not uncommon for completely new solutions to appear absurd. Due to the high frequency - and thus the almost constantly available modulation of the AC curve in both directions - a "quiet" voltage could be available (at least for the audio range, but not for the specified frequency range up to 4 MHz ... ). It would have been a completely new thing and no guarantee can be given that all information given in this article is absolutely correct; they are not complete anyway - because of their brevity. The article was actually only intended as a short, rough preliminary report, which should have been followed a few weeks later by a test report with the exact basics. Unfortunately, that didn't happen. All in all, a very mysterious and also - since it could not be clarified - embarrassing for us. Precisely because of the great initial euphoria. - Felix Wessely.
Please do not ask us about this. Unfortunately, we don't know more about it.@
ITM praktiker - Leseprobe: Brain Audio: Multikanal-Transistor - praktiker verlag
Addendum in mid-2009: Since this report is apparently linked from several pages and there are repeated inquiries after its removal, it was made available again. The problem with this is that in the end it didn't get around to getting a test copy. Just a few weeks after the presentation at IFA Berlin, the developer was no longer available. He is said to have passed away soon afterwards, as we had heard rumors from several quarters. It is not uncommon for completely new solutions to appear absurd. Due to the high frequency - and thus the almost constantly available modulation of the AC curve in both directions - a "quiet" voltage could be available (at least for the audio range, but not for the specified frequency range up to 4 MHz ... ). It would have been a completely new thing and no guarantee can be given that all information given in this article is absolutely correct; they are not complete anyway - because of their brevity. The article was actually only intended as a short, rough preliminary report, which should have been followed a few weeks later by a test report with the exact basics. Unfortunately, that didn't happen. All in all, a very mysterious and also - since it could not be clarified - embarrassing for us. Precisely because of the great initial euphoria. - Felix Wessely.
Please do not ask us about this. Unfortunately, we don't know more about it.@
ITM praktiker - Leseprobe: Brain Audio: Multikanal-Transistor - praktiker verlag