Aleph J illustrated build guide

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#10,061
OK for real this time. I'm ready to start on the amp board (power supply is built and tested, all good there). Any changes I should make from this build guide?

R6 & R30 - jumpers
R7 - 2k pot (but have a note to set it to 1k before putting in the board)
R8 - 1k resistor (instead of a pot)
R27 - 68k pot (set to 68k before installing)

I am using balanced inputs and have the matching Neutrik RCA adapter if I want to plug in that way.

https://diyalephj.blogspot.com/2020/10/building-amp-boards.html

Thanks!!! And shame on me, life has gotten in the way but it's go time finally.
 
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#10,063
Proof of life, getting things setup.
IMG_2878.jpeg
 
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#10,064
Getting ready to start my build and am working on my parts order using the Mouser saved cart on the DIY Build Guide site.

The Panasonic .47 ohm 3w resistors are NLA and I see that there are two alternatives. One from Vishay @ $6.35 ea and one from TE Connectivity @ $0.09 ea - that's a huge difference and I just want to confirm that I am ok going with the cheaper option?

https://www.mouser.com/c/passive-co...&resistance=470 mOhms&tolerance=5 %&instock=y

Also, these 'Audio Grade' capacitors are also NLA but there are several standard grade alternatives - any issues with not using Audio Grade here?

Many more questions to come I am sure.

Thanks!
-Jeff
 
#10,068
Has anyone had the experience of actively cooling the MOSFETs with a paltier? Interested to know if operating the MOSFET at a lower temperature may improve its operation and longevity. The idea is to put the paltier between the MOSFET and the large chassis heatsink. Am I hallucinating?
 
#10,069
I do not believe this will work. The peltier element is incredibly inefficient and your heat sink must now take care of both your mosfet and the peltier element. Best case scenario you get a scorching hot heat sink and a mosfet at about the same temp as before or slightly hotter with a larger electricity bill.
 
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#10,070
Question. I am building using the Noob's guide, everything is has gone well so far, all boards are built and I am now at the "Testing the Power Supply" step. DBT worked as expected. Step 3 - measuring V+ and V- suggests a reading of 26v or thereabouts, I am getting 27.4V - all good I assume? The regular build guide says "25V or more"

Thanks
 
#10,076
Happy to report that as of 11:30am EST my Aleph J is making music! My workbench Minimus 7s have never sounded so good. I followed the Noob's guide and everything went pretty smoothly. Built the boards last weekend and put everything together over this past weekend. Will swap it in for my ACAs this evening after I finish putting the case together.

Having a heck of a time getting the fuse holder all the way in, have cracked one fuse already.
 
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#10,077
Guys,
I want to build Aleph J as a speaker/headphone amp. How big is offset in your builds? Is it stable? How does it change overtime with warmup? A friend of mine has built it and shared that offset is not rock solid and can be a bit much for headphones.
In that case I guess I need a DC servo, right? Has anybody tried that? Or am I the first crazy to use that amount of amp for headphones 😉
 
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