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Old 18th January 2012, 03:01 AM   #1
6L6 is online now 6L6  United States
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Default Aleph with BrianGT boards

I recently acquired a set of BrianGT Aleph boards. The most current black ones, with the nifty break-away daughterboards for the big transistors.

Photo - Click the image to open in full size.

As the Alephs are not the current 'super popular' project (having being supplanted by the F5 these days) the bulk of the information I can find is old, with lots of broken links and lost photos.

Also, with Brian's website have been down for some time now, there is a notable lack of information.

Does anybody have a known good schematic that works on those boards? There is room for up to 3 output devices/ current sources per channel, and it uses TO-220 size transistors for the drivers.

I seems to me that an Aleph 3 or an Aleph 5 should work, and perhaps a mini Aleph. ??

Lastly is there any good information on making an Aleph into a headphone amp, like this -- 6moons audio reviews: Reality Check with Terry Aben ?

Thank you in advance.

Last edited by 6L6; 18th January 2012 at 01:58 PM.
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Old 18th January 2012, 06:29 AM   #2
slomatt is offline slomatt  United States
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6L6,

I'm in somewhat the same situation, several years ago I bought a set of BrianGT Aleph boards and I'm just now getting around to building the amp.

Two mini-aleph threads I found useful are:
The Mini-A
Mini Aleph Power Supply

I attached a copy of the schematic diagram that I've been using. One thing you should be aware of is that one of the versions of the amp boards has a capacitor's polarity marked backwards on the board, I think it is C2 but you should compare with the schematic to be sure.

The parts list for the amp is still available from chipamp.com http://www.chipamp.com/diyaudio/mini-A.xls, and I've attached a parts list I found for the power supply boards.

Since the part lists were created several years ago a few of the parts are no longer available from Digikey. Here are the substitutions I made, these are not tested but as far as I can tell should work.

Amp
C5 (PS1H103G-ND) is no longer stocked, Digikey recommended P4513-ND instead.

Power Supply
D1-D4 (MUR1560OS-ND) is no longer stocked. Substituted MUR1560GOS-ND which is a RoHS replacement
Heat sink for D1-D4 (HS184-ND) is no longer stocked. Substituted HS346-ND.

I'm about to place an order with Digikey, but first I need to decide what to do with the CRC filter in the power supply. One option is to just use jumpers for R3-R12, another is to put in resistors to create a low pass filter. I posted some questions in the power supply thread I linked above, but haven't had any responses yet.

Anyway, I hope this helps get you started. Be sure to post updates as your project progresses.

- Matt
Attached Files
File Type: pdf miniasch.pdf (22.4 KB, 257 views)
File Type: zip ps-parts-list.xls.zip (9.4 KB, 116 views)
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Old 18th January 2012, 07:29 AM   #3
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Quote:
Originally Posted by 6L6 View Post
I recently acquired a set of BrianGT Aleph boards.

Does anybody have a known good schematic that works on those boards?
Aleph J is also possible to build from these boards.
I did it two years ago.
Aleph J thread is not too long and informative enough.

See attachment for AJ component numbers on this board (Red)
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File Type: jpg aleph j brian gt.JPG (169.8 KB, 1156 views)
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Old 18th January 2012, 07:35 AM   #4
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Also
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Old 18th January 2012, 07:48 AM   #5
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Also.
Red crosses = useless components
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File Type: jpg Aleph 30 mod.JPG (110.2 KB, 1117 views)

Last edited by bobodioulasso; 18th January 2012 at 07:51 AM.
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Old 18th January 2012, 01:16 PM   #6
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Great, I also have these boards...have a few, wanted to build a mini or a 30, and mainly I would really like to build a pair of Aleph 2 amps...

Russellc
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Old 18th January 2012, 05:13 PM   #7
6L6 is online now 6L6  United States
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Wow! Great info so far! Thanks so much!

Does anybody have a Aleph 3 or 5 schematic with the same part numbers as the board?
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Old 18th January 2012, 05:28 PM   #8
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Quote:
Originally Posted by 6L6 View Post
Wow! Great info so far! Thanks so much!

Does anybody have a Aleph 3 or 5 schematic with the same part numbers as the board?
I am interested 2.

Regards zeoN_Rider
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Old 18th January 2012, 07:10 PM   #9
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Originally Posted by 6L6 View Post
Lastly is there any good information on making an Aleph into a headphone amp, like this -- 6moons audio reviews: Reality Check with Terry Aben?
I am interested in this mod... I've always wanted to try out the "Aleph sound" but have no metalworking capabilities for large heatsinks. Maybe we can just adapt an Aleph preamp schematic for use on the boards?

This is a great thread! There is just too much information in the hundreds of pages of all the other mini-Aleph threads...
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Old 18th January 2012, 07:31 PM   #10
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This should get you started - for the mini-a or a30 configurations.
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File Type: pdf miniALEPH-parts_list.pdf (133.4 KB, 230 views)
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