The Aleph Design Reloaded

[kasey197]

Thank you Nelson!
And to preempt the inevitable question on where to buy the 2SJ313, here is a source that I have used. He sells them at a very reasonable price but i think that you have to buy them in pairs (together with the n-channel).

http://www.diyaudio.com/forums/vendors-bazaar/232093-fs-tos-2sk2013-2sj313.html

From what I can see, Bdent has them as well.

 

[mlloyd1]

probably should have matching p channels devices for the aleph input stage - can't tell if that source provides them in either polarity?

mlloyd1

 

[Zoef]

Is there a list in one of the threads containing info about fet equivalent / drop in replacements? (Upgrades) could not find this.

 

[EUVL]

> However on these I decided to try my favorite small power Mosfets, the Toshiba 2SJ313's.

Have you tried 2SJ79's ? 🙂
Worthy of serious considerations.


Patrick

 

[6L6]

Anyone have pcb layout to share? thanks Papa for mods

This will work -- Aleph through-hole PCB Set | Chipamp Electronics

 

[Zoef]

When using irf9610's, do they need to be matched at 20mA?
No harm in using 2SC2240 instead of MPSA18?
(posted same question in other thread)

 

[Zen Mod]

When using irf9610's, do they need to be matched at 20mA?
No harm in using 2SC2240 instead of MPSA18?
(posted same question in other thread)

bumble bee

 

[Zoef]

bumble bee

hahaha bzzzz

Am i correct on the matching at 20mA?

 

[Zen Mod]

yup

bumble bee

 

[thiagomogi]

It is best to draw my own PCB single side: D
Criticism and praise are welcome.
Best Regards

 

[Zen Mod]

last time when I checked , 2SJ313 was mos-fet , not J-fet

 

[thiagomogi]

ALEPH 3M 😛

 

[Zen Mod]

without looking further (having nerves only for my own pcbs ) - outputs need to be closer to the edge

 

[thiagomogi]

Thank ZEN .
8mm is too much?
I will try to decrease without affecting the rail of the mosfet .
Best Regards

 

[AudioSan]

maybe turn the 2 matched SJ313's around so the they are back to back and thermally couple them together. or side by side so they can share a smal sink or a smal alu sheet.

 

[thiagomogi]

Ok , I did not know he needed to be thermally acomplados .
thank AudioSan

 

[AudioSan]

they don't have to be. it's just to make sure they operate at the same temperature.

 

[thiagomogi]

thanks for the tip .
Another improvement in my PCB?
Cumpprimentos

 

[6L6]

Break the trace between GND and -IN, add pads for jumper.

Balanced input (XLR) needs that separated, but if the builder will use RCA exclusively, the jumper can be installed.

Can you also add pads/holes on the capacitors for 7.5mm and 5mm lead spacing?

 

[thiagomogi]

yes 6L6 , I will make the proposed changes, thanks for the observations