Humble Aleph-X from the Netherlands

[Taco]

Atlast I have some pictures before the second group buy pcb's are distributed. The following pictures show a baby Aleph-X with 17Volt rails and 4,5 A bias. The transformers are from Reichelt and are 330 VA dual 15V. I used four irfp240 for each channel. With the 17Volt rails things get pretty hot, so I blew some stuff before I got this result . But replacing the heatsinks and making these mono's things worked out fine. The C-R-C filter in the powersupply is 47.000uF - 0.28 Ohm- 47.000uF for both the plus and minus rail. But enough text, here are the pictures:

The front of one mono:


The interior:


The backside:


Also I finished my Balanced Linestage (still to be X-ed):



Thanks to Nelson, Grollins, Edwin, Netlist and others for their help.

[Netlist]

Nice job Taco,
I like the grills on top.
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?

Any impressions of the sound?

/Hugo

[roddyama]

Great Job Taco.

You don't need to be humble about that effort.

Tell us how it sounds.

[Dennis Hui]

A fine job Taco. Nice and compact.

I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

How does it sound, and hot does it run?

Cheers,
Dennis

[roddyama]

Originally posted by Dennis Hui
I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

Dennis

Hi Dennis,

Check here under "Raw Materials and Springs-Metals-Metal and Thermoplastic Cloth and Perforated Sheets":
http://www.mcmaster.com/
http://www.mcmaster.com/param/asp/ps...8=521,158=6215

[Dennis Hui]

Originally posted by roddyama

Hi Dennis,

Check here under "Raw Materials and Springs-Metals-Metal and Thermoplastic Cloth and Perforated Sheets":
http://www.mcmaster.com/
http://www.mcmaster.com/param/asp/ps...8=521,158=6215

Rodd,

Thanks a bunch!

Dennis

[promitheus]

Looks very nice.
Which boards are those?
The famous Aleph-X boards which are being ordered again?
How much power did you get with 4 Mosfets?

[Taco]

Originally posted by Netlist
Nice job Taco,
I like the grills on top.
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?

Any impressions of the sound?

/Hugo

The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic. The resistors are two 10 Watt 0.56 Ohm resistors parallel and it is about 40 -50 degrees Celsius. The amplifier is very very very very silent. I can't hear a thing. If I turn on the preamp I can hear the noise of the preamp (holding my ear against the tweeter). But I must confess that my speakers have a sensitivity of about 85 db/W/m. (But my room is only 25 m^2, still a student in a small country ).

Originally posted by Dennis Hui
A fine job Taco. Nice and compact.

I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

How does it sound, and hot does it run?

Cheers,
Dennis

The whole chassis warms up to about 25 -30 degrees above ambient.

Promitheus: This are the famous Aleph-X boards, output power is about 40 Watt according to calculations, 17Volt + bias of 4,5 A. (see for excel-sheet elsewhere)

[hifiZen]

Ooooh, CRC filter, and a clean, tight chassis layout. Looks like some really nice metalwork, too.

Nicely done indeed, Taco!

[CheffDeGaar]

Oops, almost missed this one !

Very nice job, Taco !
I know the amp is dead silent, but weren't you afraid by locating the IEC inlet so close to the inputs ?. It's something I search to avoid, but surely the balanced connection helps a lot

Originally posted by Taco
The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic.

Yes ! Yes ! Exactly what I feel, and it's becoming more and more obvious as the amps (or my ears and brain ???) break in

Congrats again.