Tube Sound from Solid State

lumanauw · 4th January 2007, 10:16 AM

Patent #4987381

Using mosfet, front end has about +/-20V rail higher than the output stage rails, feedback is taken before the output stage.
The intention is to make the mosfet output stage clipping (due to higher front end voltages), and we get tube sound

lumanauw · 4th January 2007, 11:18 AM

Another one I'm not so clear about :

Heating the circuit?

darkfenriz · 4th January 2007, 12:17 PM

I don't thing it is the good way to do it.
First you won't correct crossover distortion, secondly the clipping will cause deep saturation and probably risk of cross-conduction big.

Still it is not hard to build a small-signal distortive class A stage before an amp and add some resistance to amp's output.

lumanauw · 4th January 2007, 06:23 PM

This article about how tubes, mosfets, opamps, bipolars clipping is interesting.

http://milbert.com/articles/TvsT/tstxt.pdf

But I still don't understand why to intentionally make the mosfet (outside feedback loop) clipping?

4th January 2007, 10:16 AM	#1
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Tube Sound from Solid State Patent #4987381 Using mosfet, front end has about +/-20V rail higher than the output stage rails, feedback is taken before the output stage. The intention is to make the mosfet output stage clipping (due to higher front end voltages), and we get tube sound

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4th January 2007, 11:18 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Another one I'm not so clear about : Heating the circuit?

4th January 2007, 12:17 PM	#3
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	I don't thing it is the good way to do it. First you won't correct crossover distortion, secondly the clipping will cause deep saturation and probably risk of cross-conduction big. Still it is not hard to build a small-signal distortive class A stage before an amp and add some resistance to amp's output.

4th January 2007, 06:23 PM	#4
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	This article about how tubes, mosfets, opamps, bipolars clipping is interesting. http://milbert.com/articles/TvsT/tstxt.pdf But I still don't understand why to intentionally make the mosfet (outside feedback loop) clipping?

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