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Old 28th May 2002, 06:57 AM   #1
diyAudio Member
Join Date: Dec 2000
Location: Germany
Default 2-stage aleph

Hello you guys,

have build a little 2-Stage Aleph approx. 10 Watt
as a horn driver. Sound is very pleasent, but the noise is to high. Would it be a good idea to change the first diffamp to a matched J-fet pair
or have you other suggestions.

Reinhard from Germany
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Old 28th May 2002, 09:09 PM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
It would be an excellent idea. Try 2SJ74's or better,
2SJ109 matched pairs. They should drop right in, but
you might consider dropping the bias current by half.
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Old 29th May 2002, 10:49 AM   #3
diyAudio Member
Join Date: Dec 2000
Location: Germany
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Hello NP,
thanks a lot for your comments, that was what I wish to hear.
I will try 2SK389 as diffamp and built the amp
upside down with P-Channel outputs.
Reinhard from Germany
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