2-stage aleph

reinhard · 28th May 2002, 06:57 AM

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

Nelson Pass · 28th May 2002, 09:09 PM

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.

reinhard · 29th May 2002, 10:49 AM

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

28th May 2002, 06:57 AM	#1
reinhard diyAudio Member Join Date: Dec 2000 Location: Germany	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

29th May 2002, 10:49 AM	#3
reinhard diyAudio Member Join Date: Dec 2000 Location: Germany	NP´s reply 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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28th May 2002, 09:09 PM	#2
Nelson Pass The one and only 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.