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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 7th September 2013, 11:42 PM   #31
Bones13 is offline Bones13  United States
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Aleph J illustrated build guide
I ordered the 500VA with 18v secondaries. I gave thought to the 600VA with 4x 18v, and doing 2 separate rectifier/capacitor sets, but figured I could do better stuff on a single set. The interior of the case will have more room.

I plan extra effort on the push button and soft start circuits, along with trying to really separate PSU from the signal sides.
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Old 10th September 2013, 03:06 PM   #32
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Jim,

Thanks much for getting this up. I'll be looking forward to getting started fairly soon.

-- Jim
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Old 10th September 2013, 03:12 PM   #33
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by rif View Post
Jim-what are those bridge rectifiers? I can't seem to find them at digikey in fast recovery type.
They are not fast-recovery. It's best to avoid fast diodes in a Class-A PSU.

Papa talks about it here - https://www.passdiy.com/project/articles/power-supplies

This is the part I'm using - GBPC3502-E4/51 Vishay Semiconductors | Mouser
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Old 10th September 2013, 03:17 PM   #34
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by henryve View Post
With the new layout allowing for a bigger cap things will be very tight when using that bigger cap, and with RN60 resistors might even be impossible to mount a bigger sized cap for C2.
There are a number of ways to avoid having a problem, the first is obviously to use smaller components.

But in lieu of that, the resistor can always be mounted higher and bent out of the way, or

You could mount it soldier-style and have only the thin lead on that side, or

You could mount that resistor on the bottom of the PCB.

All those solutions work well.
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Old 11th September 2013, 12:36 AM   #35
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Quote:
Originally Posted by 6L6 View Post
They are not fast-recovery. It's best to avoid fast diodes in a Class-A PSU.

Papa talks about it here - https://www.passdiy.com/project/articles/power-supplies
I don't quite see the reasoning there. Are they noisier? Also, this is a piece of conflicting information.
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Old 11th September 2013, 03:27 AM   #36
6L6 is offline 6L6  United States
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Bias, Adjustment and Distortion section added.
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Old 11th September 2013, 08:57 AM   #37
doolav is offline doolav  United Kingdom
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Jim, in your bias setup last 2 distortions are 0.07% and then 0.45% - did it increase with a higher bias or it is a typo?
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Old 11th September 2013, 12:10 PM   #38
6L6 is offline 6L6  United States
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Oops! Forgot a zero... The 500mV (very hot) bias should be 0.045%

That's why I have the photo of the meter - you can see that it's lower.
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Old 11th September 2013, 03:16 PM   #39
6L6 is offline 6L6  United States
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It's been fixed.
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Old 11th September 2013, 03:22 PM   #40
wengtech is offline wengtech
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hi 6L6,
i have toroidal with 25-0-25 / 20A
can i use with aleph J ? (previously it is okay with my aleph 30)
i am afraid it will run too hot for the J

thanks.
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