Aleph J vs. Aleph Mini

salesmonster · 14th April 2008, 02:55 AM

I'm preparing to build my first Pass amp.

Has anyone out there built both the Mini and the J?

The amp will be driving a 2 way 8 ohm speaker with 90 db efficiency. I live in an apartment, so my power needs aren't great.

I'm planning on eventually building both.

The question is which one should come first? I have already built one chipamp and one discreet amp, so I don't feel too overwhelmed.

Opinions anyone?

Dave

traw · 14th April 2008, 04:28 AM

i'd go for the J... can run it on the mini power supply, er mini aleph J. just jumper some of the 221's, 1k in place of the 221 to current source, 1k instead of the 392. twist legs on ztx550, twist legs on 2sj74's, the 4.75k to ground versus negative rail fine. throw 1uf poly cap in place of one of the 220's. I think 'freewheeling', leaving out the dc bias adjusting 68k, gave me hair over 1.5amp bias. think i also found 47k in the traditional spot on aleph boards yields around 1 amp bias, something like that cannot remember for sure.
works well.
IMO, the J more open detailed on the upper end.

Babowana · 14th April 2008, 06:00 AM

You will build both. Then, just build anyone first.
I don't believe there will be "big" difference
in sound between the two to regret any thing . . .

Good luck . . .

14th April 2008, 02:55 AM	#1
salesmonster diyAudio Member Join Date: Aug 2007	Aleph J vs. Aleph Mini I'm preparing to build my first Pass amp. Has anyone out there built both the Mini and the J? The amp will be driving a 2 way 8 ohm speaker with 90 db efficiency. I live in an apartment, so my power needs aren't great. I'm planning on eventually building both. The question is which one should come first? I have already built one chipamp and one discreet amp, so I don't feel too overwhelmed. Opinions anyone? Dave

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14th April 2008, 04:28 AM	#2
traw diyAudio Member Join Date: Sep 2005	i'd go for the J... can run it on the mini power supply, er mini aleph J. just jumper some of the 221's, 1k in place of the 221 to current source, 1k instead of the 392. twist legs on ztx550, twist legs on 2sj74's, the 4.75k to ground versus negative rail fine. throw 1uf poly cap in place of one of the 220's. I think 'freewheeling', leaving out the dc bias adjusting 68k, gave me hair over 1.5amp bias. think i also found 47k in the traditional spot on aleph boards yields around 1 amp bias, something like that cannot remember for sure. works well. IMO, the J more open detailed on the upper end.

14th April 2008, 06:00 AM	#3
Babowana Formerly "jh6you". R.I.P. Join Date: Jul 2006	You will build both. Then, just build anyone first. I don't believe there will be "big" difference in sound between the two to regret any thing . . . Good luck . . .

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