Aleph J for Universal Mounting Spec - Page 36 - diyAudio
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Old 22nd June 2013, 02:02 PM   #351
6L6 is offline 6L6  United States
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Great news! -

CIRCUIT BOARDS AVAILABLE SOON!




Jason has asked me to write a blurb describing the amp and PCB for the store, as the ball is rolling again and the boards will be in the store in the near future. (Summer 2013)

They should be available for preorder in the next few days. I have no information as to the specific time they will ship, just that things are in-progress.

Please, if you have any interest in this project, order a set of the PCB. Purchasing something the DIYaudio store is a fantastic way to support the website. Also, while you are there, look at how fantastically awesome the ACA kits look...

The Aleph J build guide is being worked on now and will be complete by the time the PCB are shipping. (Hopefully sooner.)
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Old 22nd June 2013, 02:06 PM   #352
PKI is offline PKI  United States
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Thanks for your efforts, 6L6! This amp is very nice! :-)
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Old 22nd June 2013, 07:55 PM   #353
6L6 is offline 6L6  United States
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Quote:
Originally Posted by PKI View Post
Thanks for your efforts, 6L6! This amp is very nice! :-)
Have you got Justin's set of green PCBs now? I think he mentioned that.

What do you think?
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Old 22nd June 2013, 10:57 PM   #354
PKI is offline PKI  United States
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They are really nice. I put everything according to original schematics and without adjusting anything got 1.1A bias and ~8mV offset. I soldered trims, but did not have to, just resistors would perfect. Really enjoying the sound, like it so much better than F5. However, even though, the amp sound more audiophilic, I say that all MOSFET aleph 60 I had sounded much denser. Sorta more mature with "more balls". Not as detailed though :-)
Damn, mr. Pass, I just can't choose between your amps! Looks like I will have them all here in the end :-)
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Old 22nd June 2013, 11:11 PM   #355
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Genera would say the dense sound is from the IRF mosfets in the A60
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Old 25th June 2013, 06:05 PM   #356
6L6 is offline 6L6  United States
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Aleph J Circuit boards available for preorder.

Gentlemen, look at what was added to the DIYaudio store today...

Aleph J (2 PCBs, makes 2 channels; Rev 2.0) - Circuit Boards



It's first come first serve, so order soon!
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Old 25th June 2013, 06:11 PM   #357
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I would say that this is till one of my favorite amps and really defines what Nelson has done with sound. Just a lovely amp. Some of the best mids and highs you will find.
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Old 25th June 2013, 06:29 PM   #358
Mr. dB is offline Mr. dB  United States
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Is +/- 24V power supply pretty much the limit for this amp?
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Old 25th June 2013, 06:32 PM   #359
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At standard bias of about 1.2a, I would say yes unless you have nasty big heatsink. You are looking at over 100W dissipation per channel. I would say minimum is 2 x 8" tall 10.08 Heatsink USA profile, tied tiogether with two fets on one and two on the other. At 24V, your internal temp is getting in 30C range, which will most likely push your sink temp to around 55-60C
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Old 25th June 2013, 06:34 PM   #360
6L6 is offline 6L6  United States
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This amp gets quite a bit hotter than an F5, and hotter than an F4.

I have my bias set at ~20W/device, and the big chassis gets quite toasty.
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