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Aleph J for Universal Mounting Spec
Aleph J for Universal Mounting Spec
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Old 28th January 2018, 01:14 AM   #731
moppy is offline moppy  Malaysia
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Default PCB

Quote:
Originally Posted by didiet78 View Post
Another Update

- Add gate stoper for JFET
- Add Cbypass for C3
- Add Resistor for Q2

Didiet
Is the Aleph J pcb still the same as this? I plan to do my own PCB. I have not expert into this but if this is the pcb then I have no problem to make it.

Or anyone could share the AJ pcb in pdf?
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Old 30th January 2018, 10:08 PM   #732
NicMac is offline NicMac  Italy
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Aleph J for Universal Mounting Spec
Default Aleph J with K170 and IRFP9240

Possibly a stupid question, but could the Aleph J circuit not be "inverted" to use 2SK170 for the input stage and IRFP9240 for the output?
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Old 30th January 2018, 10:42 PM   #733
Zen Mod is offline Zen Mod  Serbia
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Aleph J for Universal Mounting Spec
done and covered

more than once
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Old 30th January 2018, 10:53 PM   #734
NicMac is offline NicMac  Italy
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Aleph J for Universal Mounting Spec
Where? Not asking for specific links (you have better things to do than looking these up for me), but rather search terms that might get me there
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Old 30th January 2018, 11:08 PM   #735
NicMac is offline NicMac  Italy
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Aleph J for Universal Mounting Spec
Never mind. Found a place to start. Thanks!
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Old 2nd February 2018, 10:18 PM   #736
pchw is offline pchw  United States
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Quote:
Originally Posted by NicMac View Post
Never mind. Found a place to start. Thanks!
Hi Nic,

Found this in my hard drive, it might be what you have found..
It is a mini-aleph using N-jfet and P-mos output.

Have fun!!
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File Type: gif Aleph-Mini-J-Pch.gif (8.5 KB, 513 views)
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Old 1st June 2018, 08:05 AM   #737
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by 6L6 View Post
That PSU is fine if of sufficient current. More voltage will be detrimental.

Yes, you may bread board it, but remember that the Mosfets must be adequately heatsinked. Alephs run hot!

It's a great amp, you'll love it.
Why would more voltage be detrimental...??
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Old 1st June 2018, 12:25 PM   #738
6L6 is offline 6L6  United States
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Aleph J for Universal Mounting Spec
Firstly, it's going to get hotter. Watts is V x A, so increasing V will make more watts, an in the example of this amp, that's all going to be more heat in the heatsinks that needs to be dissipated.

Also you'll need bigger V rated capacitors, and at a certain point you'll burn up the Jfets.
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Old 1st June 2018, 02:07 PM   #739
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by WalterW View Post
Hi ZM, here are the voltages... left and right measure identical. Everything is measured against ground.
PSU is between 24.0 and 24.2 volts. Bias is 0,38 volts over 0.47 Ohm. meausured with a warm 49C amp.

Maybe the thump is high because of the current limiter I left out?
Thanks, Walter
Did you find the root cause of that nasty thump?
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Old 9th June 2018, 03:25 PM   #740
mattattnet is offline mattattnet  United States
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Default Which way to go?

I have a 4U 400mm Dissipante chassis with stout dual mono +18v/-18v rails, and want to try it with a low voltage Aleph J build.

I have very efficient speakers and am not worried about maximum power output, but rather, how to get potentially the best sound out of the lower rail voltage.

Is it best to use all 4 output mosfets, or drop to one pair of outputs, ala Mini Aleph-J?

Thanks,
Matt
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