Project Aleph 5

[deuze]

Hello everybody,
i want to try to build an Aleph 5 but i have a lot of question for a parts !

I want to build this amp with the schematics and pcb of http://www.kk-pcb.com/

For powersupply what do you think about this parts ...

link for schematics : ALEPH 5 POWER SUPPLY

Transfo ... http://www.amplimo.nl/images/downloads/ds standardrange/78057.pdf

Capacitor 22000uf... PANASONIC - ECOS1VP223DA - CAPACITOR ALUM ELEC 22000UF 35V 20%, SNAP-IN
ECOS1VP223DA - PANASONIC - CAPACITOR ALUM ELEC 22000UF 35V | Newark

Capacitor 4.7uf... VISHAY ROEDERSTEIN - MKP1839547164 - CAPACITOR AXIAL, MKP, 4.7UF, 160V
MKP1839547164 - VISHAY ROEDERSTEIN - CAPACITOR AXIAL, MKP, 4.7UF, 160V | Newark

Bridge Rectifier... VISHAY GENERAL SEMICONDUCTOR GBPC3506-E4/51
GBPC3506-E4/51 - VISHAY GENERAL SEMICONDUCTOR - BRIDGE RECTIFIER, 1PH, 35A, 600V | Newark

Choke... WURTH ELEKTRONIK - 744824622 - CHOKE, COMMON MODE, 2.2MH 6A
744824622 - WURTH ELEKTRONIK - CHOKE, COMMON MODE, 2.2MH 6A | Newark

Thank you for your answer.

 

[stoN_Cold]

Better search for Brian GT PCB!

Regards zeoN_Rider

 

[deuze]

Ok thanks i check

 

[AudioSan]

use 50V caps. not 35V.
and 400VA transformer, insted of 300VA don't hurt🙂

 

[slr 5000]

g,day

use the kkk pcb its a much better setup than the brian gt boards or peter d boards (i have all of the above )

more room for parts and the output devices space out way better on the sinks dissipating the heat better and allowing for higher bias /better sound ,they are very good boards

for the power supply go to aussie amplifiers and grab a pair of his psu3, they are already made and work perfect

i have been using the above with some nuvotem potted toroids for 5 years with no problems and if i had to build again i would do it the same


cheers

 

[AudioSan]

how on earth can kk-pcb's board spread the heat better then chipamp's boards, with seperat outputboards???? it's the other way around.
regarding PSU. chipamp also got some very nice PSU pcb's. at a very good price.

 

[stoN_Cold]

KK-pcb's are low quality. Brians at least gold plated.

These are my:

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Regards zeoN_Rider

 

[slr 5000]

gold plated does not mean quality

layout thickness ect determins quality
as i said i have used all three pcbs mentioned ,have you ?

i owe nothing to any of the pcb makers mentioned i am just stating based on experiance which one is best

if you were building a head amp or one to be installed in a very small case then brians pcb or pd,s would be great
but for a full size amp the benefets stated in my first post can not be denied

i get the impression that seeing as you have the brian gt boards you will say they are the best regardless of if they are or not but i on the other hand have all three pcb,s and know which i would use

cheers

 

[AudioSan]

i will also say that brin's pcb is the best one. and i have those. i also have kk-pcb's boards.

 

[AudioSan]

are you joking or what audio san
the output spacing on the brian gt boards is too close and does not spread the heat over a normal sink properly (being outboard does not make a difference)
it concentrates all the heat in a small area
the spacing and size of the kkkpcb boards spread the heat over a much larger area

i thought this would be pretty simple to understand

i will say again i have all the above boards do you?

where do you get this from?? wonderland?
yes 3 and 3 fets are a little closer. but wht bout the distance between the 2 3 groups? forgot that or what?

 

[slr 5000]

pics will show what i am on about

i have sat the brian gt pcb next to the kkk to show the difference

one looks like a kids toy the other a real mans class a amplifier

 

[AudioSan]

thats aleph2 and not aleph5
at the cost of 109euro vs $9.
and BTW. for aleph2. that 6match sit way to close to spread the heat over som big sinks. i have tried.
with brian's boards, you can also drop the middle fet an use as many boards/fets as you like.

 

[slr 5000]

forgot to add
they are kkk aleph 2 boards in mono blocks run as aleph 5 (lower voltage rails)
this allows me to run maximum bias with better heat spread across the sinks

cheers
btw those sinks are conrad 350mm i dont see how you can say the output devices are not spread outr evenly enough to dissapate the heat
these were built to replace the same amps built with brians pcb,s and using his output boards in the same configuration you mentioned above and the sink temp on this pair is more uniform

 

[Melon Head]

looks good

 

[AudioSan]

well. you also use twice as many fets as normal. that makes heat spreading easier.
but it also cost you almost the same as aleph2's when you build them like this.

 

[slr 5000]

thanks melon head

yes same cost unfortunately audiosan but i like to think they would last a little longer

anyway they will be no more soon as the cases and powersupplys are about to be f6 ed (once nelson is kind enough to let us see the f6 schematic of course)

cheers

 

[AudioSan]

i dropped my aleph2's to use the PSU/transformer and heatsinks for firstwatt amps too🙂
F5 turbo V3.

 

[slr 5000]

nice choice
how do you find the sound compared to a2

cheers

 

[AudioSan]

i have not build them yet. i'm waiting for some new output boards.
but i did build a high bias F5 with dual output fets. and after that, the A2's was no longer in use🙂

 

[stoN_Cold]

i will also say that brin's pcb is the best one. have

Best

Regards zeoN_Rider