Studio Amp

opor · 14th January 2011, 04:56 PM

Did anyone build this amp? How is the sound?

effebi · 14th January 2011, 05:06 PM

It was already shown on this forum a while ago.
I believe the thread was by Destroyerx presenting the author, not sure.
bye effebi

Tekko · 14th January 2011, 05:07 PM

One fatal flaw with that circuit, theres no bias compensation so it'd only work in class B.

effebi · 14th January 2011, 05:09 PM

have a look here...
Bora is a nice guy from Serbia - Yugoslávia
bye
effebi

jaycee · 14th January 2011, 05:12 PM

There is bias compensation - the predriver stage is a bit strange so it's easy to miss, but the BD139/140 devices are on the heatsink and provide thermal feedback. Bias adjustment is by a 100 ohm trimmer by the look of it.

boraomega · 14th January 2011, 05:14 PM

There is nothing fatal in this amp friend, you just don't know to recognize the concept. Several hundred of Studio amps have been built successfully all over the world. I rarely accept to discus my designs in public, but I have to react on such statements.

jaycee · 14th January 2011, 06:00 PM

Hi Dr Bora

It's an interesting choice of output stage. What inspired you to try that design ? If I am right the lower transistors work as cascodes?

boraomega · 14th January 2011, 06:45 PM

Jaycee, I respect you a lot and you know that, but as I said in my previous post, I really don’t like to discus my designs in public. I hope you will understand!?

jaycee · 15th January 2011, 03:10 AM

Ah ok, I missed that part... fair enough

zikinho · 15th January 2011, 08:12 AM

I've been using one for three years now and i'm very happy with it. It met all my expectations. Very detailed, musicall amplifier with huge stage. Some pics...

14th January 2011, 05:14 PM	#6
boraomega diyAudio Member Join Date: May 2005 Location: Cacak, Serbia	There is nothing fatal in this amp friend, you just don't know to recognize the concept. Several hundred of Studio amps have been built successfully all over the world. I rarely accept to discus my designs in public, but I have to react on such statements. __________________ If you are arguing with an idiot, first make sure that he is not doing the same thing.

14th January 2011, 06:45 PM	#8
boraomega diyAudio Member Join Date: May 2005 Location: Cacak, Serbia	Jaycee, I respect you a lot and you know that, but as I said in my previous post, I really don’t like to discus my designs in public. I hope you will understand!? __________________ If you are arguing with an idiot, first make sure that he is not doing the same thing.

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14th January 2011, 05:06 PM	#2
effebi diyAudio Member Join Date: Nov 2010 Location: Milan	It was already shown on this forum a while ago. I believe the thread was by Destroyerx presenting the author, not sure. bye effebi

14th January 2011, 05:07 PM	#3
Tekko diyAudio Member Join Date: Jan 2005	One fatal flaw with that circuit, theres no bias compensation so it'd only work in class B.

14th January 2011, 05:09 PM	#4
effebi diyAudio Member Join Date: Nov 2010 Location: Milan	have a look here... Bora is a nice guy from Serbia - Yugoslávia bye effebi

14th January 2011, 05:12 PM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	There is bias compensation - the predriver stage is a bit strange so it's easy to miss, but the BD139/140 devices are on the heatsink and provide thermal feedback. Bias adjustment is by a 100 ohm trimmer by the look of it.

14th January 2011, 06:00 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Hi Dr Bora It's an interesting choice of output stage. What inspired you to try that design ? If I am right the lower transistors work as cascodes?

15th January 2011, 03:10 AM	#9
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Ah ok, I missed that part... fair enough

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