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Old 4th January 2012, 05:33 AM   #1001
nar is offline nar
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Default Aleph_4 conversion to Aleph_J finished

Please find below pics for my recently upgraded A_4 to A_J.

Those are mono blocs versions.
New mainboards are pro. factory custom made.
Other than mainboard, only change needed was the xformer, 18V/450VA per bloc.
Fuse 240V is 500 mA and holds with 2 CL60 in series.
Current is 2,3 amps as per schematic values on +/- 23,4V average. Offset 40 mV cold to 20mV idle.
Power resistors are Welwyn 3W vitreous wirewound 5% 75PPM.
Other resistors are DALE RN55 series. Onboard caps are Nichicon Audio.
Sinks 48-49 celsius at idle.

More, sound is marvelous I second Neslon when he says that A_J is the best of Aleph series

Best,

nAr
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Old 4th January 2012, 08:24 AM   #1002
Marra is offline Marra  United Kingdom
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Nice work Nar. Are you likely to make the boards available?
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Old 4th January 2012, 09:07 AM   #1003
nar is offline nar
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Quote:
Originally Posted by Marra View Post
Nice work Nar. Are you likely to make the boards available?
Thank you

Hey. Those are private builds, but tested and bugfree.
I did this as a hobby, working on Gerber files and so on, with the precious help of Pierre my canadian friend it took time and efforts to get the real thing.
Those were done on a small batch ordrer; I only have 1 board left ATM, because the left ones are reserved for friends.
So quantity is very limited But for anyone interested, feel free to contact me by PM. Depending on interest, I may study possibility of having a new batch made, maybe in bigger volume if needed.

Please do understand my use of the word may ... As I also have a life out of DIY and must make a living. Those boards were just for fun. And they worked as expected

Best,

nAr
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Old 4th January 2012, 01:24 PM   #1004
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Quote:
Originally Posted by mhouston View Post
Nice caps. Your build is almost a BoZoaC.
I guess. I used 2x 4700uf filter caps. I couldn't fit any more in my case.
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Old 5th January 2012, 03:58 PM   #1005
evanc is offline evanc  United States
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here it is my freshly minted f-5. Thanks to Mr. Pass for this design, and all that have posted before me who answered my questions before I had them.
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Old 5th January 2012, 04:26 PM   #1006
routhun is offline routhun  United States
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Simply superb! Salute to your wonderful idea to build the chassis with wood and mastery over wood working skills.

Enjoy
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Old 5th January 2012, 04:45 PM   #1007
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Nice case evenc. My f3 will look much like it, but a bit less lumber.
Nice lacour job!
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Old 5th January 2012, 07:31 PM   #1008
6L6 is offline 6L6  United States
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OOOOOHHHHH!!!! Your casework is sublime! My most sincere admiration!

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Old 5th January 2012, 07:53 PM   #1009
norb is offline norb  Germany
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@ preamp: Yes, partly. I use these heatsinks for industrial power rectifiers.

@ Jacco: Thank you. I was just too lazy to take photos, the A75 is working for three years now. In the meantime i built a B1/Pearl-Preamp, which i will upgrade to the Pearl II. Maybe i take some pics in a year or three.

Did you mean the four black circular things by uncommon rectifier diodes ? These are fuse holders, the rectifier modules can only be seen vaguely, they´re mounted on the bottom plate, where the red and black wires go to.

Hello evanc, very beautiful enclosure and superbly crafted. What kind of wood is it?

Last edited by norb; 5th January 2012 at 07:56 PM.
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Old 5th January 2012, 08:21 PM   #1010
evanc is offline evanc  United States
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Thanks

The case is cherry.....a 2.5" thick piece left over from some paying project. The top is cheap 1/2" plywood veneered with curly sycamore....another leftover.

The finish is shellac. Applied with a rag and polished. Easy enough on a piece this small.
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