My Dream Aleph 2 Coming True

[JPDuarte]

Very nice!

Where did you source the heatsinks?

That was a group buy almost 7 years ago 😱

 

[JPDuarte]

Excellent job on the case.

Antek toroids are an excellent value as well.

Thanks, but the case was a group buy 7 years ago and they cost 200 dollars each, and yes your right, they are excellent value, that was one of the causes why didn't finish then, was sourcing for 800v trans and they were asking 300 dollars.

 

[JPDuarte]

More chassis photo parts, here we have the speakers connectors, power inlet and line input, for the connectors I had to split them because the connectors holes on the chassis does not fit them, and for the line input had to modified the chassis input line hole (chassis to thick, cardas input to short.)

 

[drazen]

Hi, very nice!

Please, tell me dimensions of chassis.

Best regards,

 

[JPDuarte]

Thanks Drazen, case is 9.5" x 9.5" x 9.5" outside and 1" less inside. Have to planning very well for the big components fit inside the case without touch the output boards, my big concern right now is the power inlet is touching a little bit the transformer and the front panel is it touching the capacitors bank but I can solve this, moving the output board higher in the front panel heatsink. Here is the back heatsink panel with and without mod. The case is 5.6(0.221)mm/inc thick and cardas input was to short.

 

[JPDuarte]

I'm just waiting for inductors to do the final run!!

 

[JPDuarte]

🙂🙂 I just got them!! and by the way green is better😀

 

[JPDuarte]

I see that the psu wiring in the photo says 4.7uf, don't have that value, but I have these, the green one are .47uf the red ones and the dayton are 1uf, which one to use. thanks

 

[Mfly]

Both filter AC at different frequency. You could use them both in parallel...

 

[JPDuarte]

Both filter AC at different frequency. You could use them both in parallel...

Thanks Mfly, sorry for the late response, was out of town but here are more photos!

 

[JPDuarte]

This project has to be well thought out , because case inside too narrow and components too big, then we have to apply carpenter's law measure twice, cut once.😀

 

[JPDuarte]

Notice there's not too much space on the base plate and capacitors almost do not fit the next floor up.

 

[JPDuarte]

Building process continue.....oooh what a project. Thanks to Mr. Pass and everybody in this forum for help newbies like me.

 

[JPDuarte]

This is not the inductors final position, they go underneath that acrylic plate, that way I have more room for main board.

 

[JPDuarte]

View attachment 192540

I would like to know wich one is the reference zener ?

 

[Zen Mod]

probably that one left from most right IRF ; it's part of CCS for input stage

other 4 are inputs limiters

 

[JPDuarte]

To be sure

I've used quite a few Anteks. For 115V operation, connect red together and black together on the primaries.

Lately I have found the Anteks secondaries are not very well balanced, dual bridges are a necessity to keep them quiet.

Thanks Bill, but to be 100 % sure, when you say red together and black together, is red-red wires together to hot and black-black wires together to cold-neutral part of the inlet power. thanks in advance.

 

[JPDuarte]

After a lot of years seating in the dust , I finish my Aleph 2 amp, here are some studio photos of it.

 

[JPDuarte]

Amplifier + ouput or bias board.

 

[JPDuarte]

output board.