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Old 31st March 2005, 03:24 PM   #1
zox2003 is offline zox2003  United States
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Default Power Transistor Difference?


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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Old 31st March 2005, 08:48 PM   #2
MikeB is offline MikeB  Germany
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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.

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Old 1st April 2005, 12:30 AM   #3
Leolabs is offline Leolabs  Malaysia
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Yes ,the MJs are good stuff and also the 2SA/2SCs.You should visit


Read the articles on"Choosing Your Output Transistors"
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