Aleph J for Universal Mounting Spec - Page 60 - diyAudio
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Old 11th October 2013, 10:51 AM   #591
Zen Mod is offline Zen Mod  Serbia
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Signal Jenny proggie from net , to give you a sine , cheap DVM to measure/establish some voltage at output ( say 10V) , dummy load ( anything between 4 and 16R) and to measure voltage across lower Rs for open/closed R0

voltage measurement only need to be relative , not absolute , so DVM doesn't need to be of lab quality

so , you have it all


aha - Signal Jenny : https://dl.dropboxusercontent.com/u/...8/SigJenny.zip

R0 is R24 here :

(you need to measure voltage across R18 or R19)

Click the image to open in full size.


edit : my Paesano Logic is telling me that you're at 50% AC gain when AC voltages are same across ,say, R19 and R17 ......... but I'm never sure how's my brain working ...... biz as usual - Mighty ZM in constant state of Public Disgrace
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Last edited by Zen Mod; 11th October 2013 at 11:00 AM.
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Old 11th October 2013, 11:31 AM   #592
Marra is offline Marra  United Kingdom
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Thanks again you are a mine of information.
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Old 13th October 2013, 02:14 PM   #593
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Does anyone know if PD's aleph J boards will fit the UMS?
I have some which I started to populate, they need a case now though and the diya ones look to fit the bill. I know I could just fly lead them off the board, but if they boards fit it's perfect.
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Old 13th October 2013, 02:27 PM   #594
6L6 is offline 6L6  United States
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The Peter Daniel boards don't even come close to fitting the UMS.

However, you could drill and tap a few holes and mount them, with or without the fly leads. The spacing on the UMS is pretty large, so you wouldn't interrupt any of the existing holes, and the UMS would be able to be used for future projects.
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Old 13th October 2013, 05:42 PM   #595
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Ok, thanks. Will put some more thought into it. It may be worth getting the diya boards just for the simplicity. I don't have many components fitted to the pd board, so the replacement part cost would be worth it compared to the hassle of pulling the tap set out.
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Old 13th October 2013, 05:48 PM   #596
6L6 is offline 6L6  United States
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That's quite logical.
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Old 13th October 2013, 07:38 PM   #597
Marra is offline Marra  United Kingdom
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That's what I did unstuffed the PD boards and used the shop pcb's.
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Old 14th October 2013, 08:24 PM   #598
WalterW is offline WalterW  Netherlands
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Finished my Aleph J...
I built it in my F5 chassis which wasn't a big trouble because of the UMS specification, and the 24 volt needed for almost all Firstwatt amps.
For the F5, I used a 3 U hifi2000 chassis which isn't big enough for the Aleph J.
I can bias the Aleph cold at 400 mV over the 0.47 Ohm source resistors which results in 55C heatsinks with the lid off !
The amp seems very robust, bias lowers from 400 mV to 380 mV when warming up. So it bias itself lower when heating up!! That's not the way a F5T reacts
Offset is very stable within a few millivolts. A nice stable and complete Amp. I left out the current limiting.

I have been listening and comparing the Aleph J against the F5Tv3 for a week.
Aleph J wins in the highs and mid highs... what a detail, best I ever heard. Hi hats, cymbals, electronic music..WOW
But the F5Tv3 wins with bigger soundstage...the Aleph J seems more compact.
There is no real winner, both amps sound different, even my wife noticed but they are both great !

Next is to build the Aleph in his own chassis, I'm thinking of a easy, compact, nice computer case with ( very silent) forced air cooling
Like the cases of Streacom, Fractal Design and Lian Li ...

And of course, as always...here are the pictures...

Thanks of course to Mr. Pass and Jim (6L6) for his great Aleph J kit and building guides!

Last picture is the Pass Trio...

Walter
Attached Images
File Type: jpg 1-negative input to ground.jpg (451.5 KB, 172 views)
File Type: jpg 2- 2SJ108 coupled.jpg (402.7 KB, 162 views)
File Type: jpg 3- Kerafol.jpg (425.9 KB, 158 views)
File Type: jpg 4- overview.jpg (450.7 KB, 155 views)
File Type: jpg 5- complete Aleph J missing one jumper.jpg (399.5 KB, 102 views)
File Type: jpg 6- inside.jpg (359.0 KB, 105 views)
File Type: jpg 7- sideview in F5 case.jpg (358.0 KB, 119 views)
File Type: jpg 8- inside front.jpg (293.9 KB, 123 views)
File Type: jpg 9- Pass Trio.jpg (254.1 KB, 110 views)
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Old 14th October 2013, 08:31 PM   #599
12B4A is offline 12B4A  United States
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Very nice and clean layout work!
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Old 14th October 2013, 08:37 PM   #600
6L6 is offline 6L6  United States
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Fantastic! It looks wonderful!

I'm very glad to hear that everything is working well!

So, now that your Aleph is complete... what's next??

Cheers!!

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