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 Post subject: New concept of power amp
PostPosted: Sat May 14, 2011 9:36 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7312
Location: Pleasant Hill, California
Thinking about power amp without coupling capacitors, with local feedbacks around output tubes, I come to some interesting solution.
Everything is DC coupled, input capacitances of MOSFETs are bootstrapped by feedback from anodes of output tubes, and their bias depends on stability of current sources in the negative rail of power. When tubes start, or some of them dies, everything else is fine. It is safe amp, not self-destructive.

Looks like some nice new construction, usable for both SE and PP amplifier.

Was it patented by somebody before, or not yet?

The schematic is a bit incomplete: I could not draw more because free version of Rimu Schematic software limits number of elements on the drawing.


Attachments:
Concept.jpg
Concept.jpg [ 130.36 KB | Viewed 3623 times ]

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 Post subject: Re: New concept of power amp
PostPosted: Sat May 14, 2011 9:43 pm 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
wavebourn wrote:
Thinking about power amp without coupling capacitors, with local feedbacks around output tubes, I come to some interesting solution.
Everything is DC coupled, input capacitances of MOSFETs are bootstrapped by feedback from anodes of output tubes, and their bias depends on stability of current sources in the negative rail of power. When tubes start, or some of them dies, everything else is fine. It is safe amp, not self-destructive.

Looks like some nice new construction, usable for both SE and PP amplifier.

Was it patented by somebody before, or not yet?

The schematic is a bit incomplete: I could not draw more because free version of Rimu Schematic software limits number of elements on the drawing.


I have been looking through the web almost daily for my schematics... I believe this is the first design that looks like this...

Looks very interesting..


 
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 Post subject: Re: New concept of power amp
PostPosted: Sat May 14, 2011 10:14 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7312
Location: Pleasant Hill, California
Trimpots are drawn for paralleling of output tubes. One trimpot per paralleled tube, to adjust negative grid bias for each tube.

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 Post subject: Re: New concept of power amp
PostPosted: Sun May 15, 2011 10:14 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7312
Location: Pleasant Hill, California
Here is more bias-stable version. I had to remove grid stoppers, otherwise the software refused to draw gyrators for free. Wink


Attachments:
concept1-2.jpg
concept1-2.jpg [ 102.18 KB | Viewed 3897 times ]

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 Post subject: Re: New concept of power amp
PostPosted: Sun May 15, 2011 10:14 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7312
Location: Pleasant Hill, California
Here is SE version that Revintage simulated:


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ana.png
ana.png [ 94.23 KB | Viewed 3558 times ]

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