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Old 9th December 2001, 03:28 AM   #1
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Location: Harlowton, MT, USA
What if a tube driver stage was used to drive a solid state output stage? Would it have the nice sound of a tube amp with the other benefits of solid state amps?
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Old 9th December 2001, 04:14 AM   #2
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Its been done with varying degrees of success. You could start with a web search on the Conrad Johnson Evolution 2000 and the Counterpoint Natural Progression Series.
ray
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Old 9th December 2001, 12:10 PM   #3
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Location: Melbourne/Australia

There are a couple of articles on Hybrid Amps at TubeCad,
http://www.tubecad.com/april_may2001/
http://www.tubecad.com/march2001/page20.html

Also some other projects on the web,
http://digilander.iol.it/essentialaudio/index.htm
http://www.homestead.com/whaan/files/index.html

It is something that I would like to try. I am working on a
Hybrid design of my own.

Regards,
Tim.

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Old 9th January 2002, 06:27 AM   #4
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Hi,

I'm a newbie and interested on building the hybrid 5687 with magnatec amp but can't find the magnatec.

Any replacement for magnatec BUZ900P and BUZ905P?
If there is replacement need any changes on the circuit?

Thanks
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Old 9th January 2002, 09:22 AM   #5
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The Magnatec web site is http://www.magnatec-uk.co.uk
and they seem to sell online.

As far as replacements, the BUZ900P/BUZ905P sould be prity mutch straight interchangable with most of the power mosfets commonly used in audio, you shouldn't need to change the circuit at all.

Some devices you could use are,
Hitachi 2SK1058/2SJ162
Exicon EC10N16/20
International Rectifier I am not very familiar with, but something like IRFP240/IRFP9240 looks about right.

Regards,
Tim.
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Old 9th January 2002, 09:54 AM   #6
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Thanks.

Just curious, which mosfet sound better if there is a different ?
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Old 9th January 2002, 10:03 AM   #7
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It is a question that gets asked quite offten, maybe try searching this forum, particularly the Pass Labs section.

I have only ever used the Hitachi devices.

I think that the Hitachi, Exicon and Magnatec are all very similar devices though.

Regards,
Tim
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Old 10th January 2002, 06:23 PM   #8
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Join Date: Jul 2001
Location: Italy
Hallo
get a look at my Hybrid One

ciao
Filippo
www.audiofanatic.it

PS the problem on my schematics download area is now fixed
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Old 15th January 2002, 10:23 AM   #9
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May I know how to adjust the bias for the hybrid amp 5687 and magnatec mosfet at

http://www.homestead.com/whaan/files/index.html

website ? ( the first project )
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Old 15th January 2002, 11:15 AM   #10
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The BIAS for the output section is set by trimpot P1. The DC offset is set by P2 and P3.

I would read the schematic as showing a 100mA BIAS current, so you sould adjust P1 to get a 0.022V (22mV) drop across R5 or R6.

Regards,
Tim.
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