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Old 2nd April 2003, 06:05 AM   #1
josefr is offline josefr  Poland
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I'm searching parts for my future amp - probably some kind of leach superamp mutation - yappp - output transistors. I've been comparing parameters of many of them and I'm confused - why there are so many types

Does it make audible difference if I use different transistors but with comparable parameters ?

So I'm going to use this selection:
- VCE or second breakdown voltage at least two times grater than suplay voltage
- Ic let say 15A or more
- power dissipation 200W or more

I think that it is OK, isn't it?

I'm bit afraid about 500pF capacitance of high power transistors - I'm going to use BJT. Would it be better if I used several paraller transistors with less power but also with less capaticance ?

I found that MJL21193 from OnSemi (and its complementary) available as a samples meet my expectations.
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Old 2nd April 2003, 01:58 PM   #2
josefr is offline josefr  Poland
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Nobody help me
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Old 2nd April 2003, 07:27 PM   #3
Netlist is offline Netlist  Belgium
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Originally posted by josefr
Nobody help me

I'm not familiar with the leach amp, but I know the MJL21193/4
are very decent transistors.
Can you post a schematic of your mutation? This could help a lot.
Perform a search on this forum; it also will reveal a lot of help.

Anyway, your thread is on top again.
Leach specialist will help you soon.

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