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Aleph-X Compact PCB Group Buy

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#141
Rectifier Boards

Carondimonio said:
Hi all,

I just wanted to check if there's anybody out there who didn't get his PCBs yet...

BTW, still a few sets available...😉

Cheers,

Bruno
Click to expand...


Hi Bruno,

My new rectifier boards have not arrived yet, but I'm in California, so I'm not surprised. It will probably be several more days.

Robert
 
#147
I plan to use a CLCLC filter (47mF-2mH-47mF-2mH-96mF)
A 750 VA transformer with 20-0-20 VAC.
The rail voltage should be 20 V with 10A bias using the 220 primary (high power version),
and 18.5 V at 6.5 A using 250 primary (low power version).

Paolo
 
#150
I received the boards yesterday. Thanks Carondimonio.

I am thinking to have 18.5V at the fets and biass around 7.3A since the amp will be driving a pair of B&W Nautilus 803 that go downto a minimum of 3 Ohms.

BTW please count on me for a rectifier kit.

Xavier
 
#151
Re: Carondimonio

Hi all,

analogair said:
wow
you would get around 180W @ 3.5 ohm
diss per monoblock Fet's about 400w

You really must have some BIG Heatsinks ?
Click to expand...

Well, I' m still looking for the right heatsinks at a right price... actually, I had to put this project on "stand-by" for a while, as right now I really don't have the time to work on it (I'm in the process of moving... :dead: ).

BTW, did everyone get their boards?

Oh, another thing: as far as I can see, the real interest in the rectifier part kits is not very high; so far we're around 20-22 kits, not really enough to get a good price breakdown. OK, let's wait a bit more and see what happens...

Cheers,

Bruno
 
#158
dr.strangelove3 said:


Yes, the two are from hifi2000.

Very nice quality, only they can't dissipate as much as I would have wanted. Each heatsink is about 0,23 k/w, so 2*0,23 k/w per case.
They aren't even that expensive considering the costs for a few nice heatsinks and a professional made front/plate case.

One is for the Aleph-X and the other one is for the Krell clone. Perhaps I'll also buy one of em ATI cases which are about 20cm larger and would be better for an Aleph-X.
Click to expand...

dr,strangelove3,

Which model case are they? What is the size of the heatsinks?RC
 
#159
I have that same Case from hifi2000 - but the dissipation is incorect - it is more like .43C/W and not .23C/W...I have the 3U version


I also bought this chassis for the KSA-50 Krell Clone just to find out both heatsinks are only good for one channel....
 
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