Aleph J illustrated build guide - Page 81 - diyAudio
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Old 9th April 2014, 03:10 AM   #801
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Default Finished Aleph J Mono amps

I finally finished my Aleph J. After I heard that Buzzforb did a PS in one enclosure to 2 separate mono amps, I knew that was the way I wanted to go. Mainly the enclosures are made from 0.25" polycarbonate. The PS is dual mono with 2 Antek 300VA transformers. The AC in for each channel goes through a Omron relay with a 12V coil. I can turn it on with the DPDT switch either using the onboard homemade 12VDC supply or wth the 12v out of another piece of equipment. The heatsinks for the rectifiers are HeatsinkUSA 3.5". Each rail of each channel has CLC with 84,000uF before the 3.7mH choke and 86,000uF after the choke, with 56,000uF of that being in the amp enclosure to get it close to the amp board. I do not think 170,000uF is too much. The DC goes through a Neutrik connector to each amp.
The heatsinks on the amp are 2 HeatsinkUSA 10.08 cut to 18" wide. The machine work was done by their local shop. I can give the pdf files of the drawings to anyone who asks me. The sides are their 6" low profile. I got them gold anodized in Indianapolis. I really like that gold color. With a copper heat spreader, I adjusted the bias to 0.55V and they were about 46deg C in the open. They are about 49 deg C closed up. I tried them out on the floor first to make sure they worked before mounting them. They are dead quiet with no turn on thump and no turn off thump. I really like the looks in the evening with the amber LED's glowing. Oh, in case any one wants to know, they sound wonderful. I am still getting used to the great sound. Many thanks to Nelson, 6L6, and the others who drew up the boards and gave advice.
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Old 9th April 2014, 03:39 AM   #802
Bones13 is online now Bones13  United States
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Quote:
Originally Posted by wpod View Post
Greetings- I ordered my Aleph J boards a couple of days ago and now I need to order the parts to stuff it with. Question- The Aleph J BOM, I assume that this is a listing of parts to populate one circuit board, so I need to order enough parts to stuff TWO circuit boards, correct? Mouser seems to have more parts than Digikey, is there any reaon to order elsewhere? I just need a few pointers to get going, I'm fairly good at figuring things out once I'm rolling. I'm basically a tube amp guy, so this solid state build is very new to me. Thanks for your help. Paul
I used Mouser pretty much exclusively myself. I did get some caps from PartsConnexion, and some RCA and XLR jacks from Ebay. I also found some polycarbonate bypass caps on Ebay. Pretty much the same stuff Mouser/Digikey. I find searching for the parts a bit easier at Mouser, but thats just me.

Of course you need to get your matched transistors from other sources. I got Mosfets from Buzzforb, and JFets from Spencer. I guess you can get the JFets from the DIYAudio store now. I got my case and keratherms from the DIYAudio store, and the transformer from Antek.
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Old 9th April 2014, 04:30 AM   #803
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Propitious,

Very unique styling! Congratulations!
(Oh yeah, fugly!)

Dennis
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Old 9th April 2014, 08:02 AM   #804
Marra is online now Marra  United Kingdom
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Is the sound see through also

Nice work.
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Old 9th April 2014, 09:05 PM   #805
maxst67 is offline maxst67  Italy
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hello, do you think there is a difference in sound between the resistance from 0.47 ohm
panasonic and dale?
I ask this because I want to build another aleph j for bi-amping and the first I have used panasonic resistors mouser but now they are no longer for 13 weeks
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Old 9th April 2014, 09:42 PM   #806
6L6 is offline 6L6  United States
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No difference, and Dale makes a fantastic resistor. Order which ever you can get today.
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Old 10th April 2014, 09:30 AM   #807
maxst67 is offline maxst67  Italy
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sorry I have a question to ask because I need help:
as I said aleph j on the average high and just great but the low and shallow and not controlled properly.
do you think with 2 aleph j bianplificazione vertical I could get more oomph to the bass as a single amplifier in this case should only drive a speaker and almost all the current would go to the woofer of a speaker
thanks
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Old 10th April 2014, 10:27 AM   #808
Zen Mod is offline Zen Mod  Serbia
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did you upped Iq , as written in some other thread ?
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Old 10th April 2014, 10:38 AM   #809
maxst67 is offline maxst67  Italy
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I raised my IQ is improving but is still small, I still have the edge because the temperature of the heat sink is not 'over yet
forces to 6ohm my speakers are not very suitable but I would not give up to the sound of J that I like very much
so I would not build an amp more 'muscular and lose this sound.
turning the question there is an aleph more 'powerful with the same sophistication?
thanks
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Old 10th April 2014, 01:53 PM   #810
jdg123 is offline jdg123  United States
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maxst67, I am no expert but my experience with the Aleph J and my speakers (KEF 104/2's) is not too different from your own. My speakers are 90dB/W but at 4 ohm so the AJ does not rock the house in this amp/speaker pairing. In my case I think it's my speakers that are asking too much of the amp but I did change a few things I could...

I changed my preamp to something with more gain, that helped and adjusted my speaker room position as now new frequencies are at play (the AJ is a very nice amp emphasizing a different part of the music spectrum), that helped...but I still think the matching of speaker to amp in this case is a difficult one. (I know from other systems that the room can be bass friendly...)

I could either change my speakers entirely or my crossovers to accommodate bi-amping and build a new bass amp or build another AJ and change them both to monoblocks or...introduce a subwoofer.

The subwoofer is the best option. The whole spectrum down to about 56Hz is so beautiful with the AJ and my long time friends the KEF 104/2s but...Bass is a whole different beast - needs a different speaker and a different amp given My present situation. YMMV.

The AJ is a great amp but it is always a matter of amp and speaker combined :-)
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