Power Transistor Difference?

zox2003 · 31st March 2005, 03:24 PM

Ok...

I have amplifier originali build with pair of MJ 15003/15004 on +/- 42 V rails.

I tried to swap these output's with 2sa1302/2sc5200 and I have feeling that my amp is not as powerfull as with MJ15XXX transistors.
Am I wrong or there is difference?

From my perspective it looks that MJ15003/15004 are really very good trasistors.

MikeB · 31st March 2005, 08:48 PM

Hi zox !

By replacing these transistors by that much faster powerbjts you
might have brought the amp into oscillation. (maybe too slight to see)
In this case an amp typically sounds a bit flat...

I think a better replacement would be mj21193/4, they are also TO3.
Or if you already switched to to247, the mjl21193/4.

Mike

Leolabs · 1st April 2005, 12:30 AM

Yes ,the MJs are good stuff and also the 2SA/2SCs.You should visit

www.zero-distortion.com

Read the articles on"Choosing Your Output Transistors"

31st March 2005, 03:24 PM	#1
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	Power Transistor Difference? Ok... I have amplifier originali build with pair of MJ 15003/15004 on +/- 42 V rails. I tried to swap these output's with 2sa1302/2sc5200 and I have feeling that my amp is not as powerfull as with MJ15XXX transistors. Am I wrong or there is difference? From my perspective it looks that MJ15003/15004 are really very good trasistors.

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31st March 2005, 08:48 PM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Hi zox ! By replacing these transistors by that much faster powerbjts you might have brought the amp into oscillation. (maybe too slight to see) In this case an amp typically sounds a bit flat... I think a better replacement would be mj21193/4, they are also TO3. Or if you already switched to to247, the mjl21193/4. Mike

1st April 2005, 12:30 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Yes ,the MJs are good stuff and also the 2SA/2SCs.You should visit www.zero-distortion.com Read the articles on"Choosing Your Output Transistors"

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