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Aleph J  versus  Aleph 3
Aleph J  versus  Aleph 3
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Old 19th January 2014, 04:01 PM   #11
AudioSan is offline AudioSan  Norway
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Originally Posted by sppass View Post
But is there audible difference between the two? (Aleph 3 - j)
Considering that I have in my possession already irf9610, worth the difference in performance, if any.
i would og for aleph J without doubt. i can not tell you wich or/and how much difference YOU can hear on YOUR set up. but yes. there is difference.
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Old 19th January 2014, 04:45 PM   #12
jacco vermeulen is offline jacco vermeulen  Netherlands
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Originally Posted by sppass View Post
What are these differences and these can be applied to the Aleph 3?
Max output current, AC gain setting of the current source bumper.
Pap's patent 5710522, (R4xR3)/(R1xR5)

(What, did I say bumper again ? Konshens ft J Capri - Pull Up To Mi Bumper [Official Video HD] @iAmExquisite - YouTube )

The standard J is only suited for 8 ohm and higher loudspeakers, while the 3 can drive a 2 ohm impedance all day long.

(e.g. the Aleph-J I built has a much higher bias level, with AC current gain set at 50%, in order to drive quad esl's)
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Old 19th January 2014, 04:53 PM   #13
sppass is offline sppass  Greece
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Are there differences in audio performance between IRFP244 and IRFP240?
Necessary changes in the circuit? ( if I use IRFP244)
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Old 19th January 2014, 05:30 PM   #14
AudioSan is offline AudioSan  Norway
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doubt there is much difference. but on the price there is a big difference. 244 is almost twice the price of 240.

Last edited by AudioSan; 19th January 2014 at 05:34 PM.
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Old 19th January 2014, 05:42 PM   #15
sppass is offline sppass  Greece
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LSJ74 is easy to get. hava a look at the store on this site

Which? Grade C or D?
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Old 19th January 2014, 05:56 PM   #16
AudioSan is offline AudioSan  Norway
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as far as i remember. grade C = BL.
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Old 19th January 2014, 06:12 PM   #17
needtubes is offline needtubes  United States
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Is it possible to use the Aleph 3 output section with the Aleph J input section? Seems that way you get the power and low impedance drive of the 3 with the characteristics of the J.
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Old 19th January 2014, 06:45 PM   #18
sppass is offline sppass  Greece
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Is it possible to use the Aleph 3 output section with the Aleph J input section? Seems that way you get the power and low impedance drive of the 3 with the characteristics of the J.
Is it possible?
And is it possible the aleph j with aleph 3 input section?
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Old 19th January 2014, 09:24 PM   #19
Zen Mod is offline Zen Mod  Serbia
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Aleph J  versus  Aleph 3
Quote:
Originally Posted by needtubes View Post
Is it possible to use the Aleph 3 output section with the Aleph J input section? Seems that way you get the power and low impedance drive of the 3 with the characteristics of the J.
possible , yes
more oomph , yes

Quote:
Originally Posted by sppass View Post
Is it possible?
And is it possible the aleph j with aleph 3 input section?
J is from Jfet in input

so - J becomes non-J with mosfet input
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Old 9th September 2019, 02:18 PM   #20
mbrennwa is offline mbrennwa  Switzerland
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Aleph J  versus  Aleph 3
Quote:
Originally Posted by needtubes View Post
Is it possible to use the Aleph 3 output section with the Aleph J input section? Seems that way you get the power and low impedance drive of the 3 with the characteristics of the J.
Sorry for resurrecting this. I am looking at the Aleph J for a while now, but I did not yet pull the trigger because I'd like a bit more headroom for speakers that may go a bit lower than 8 Ohm.

First of all, why does the Aleph 3 cope well with < 8 Ohm loads, whereas the Aleph J does not? I might be blind , but looking at the schematics, their power / output stages look pretty much the same to me. What am I missing?

Has anyone made an amplifier a-la Aleph J with an output stage that works fine with < 8 Ohm loads? How?
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