My new Aleph-2

[yang]

This is my Aleph-2.

 

[rwagter]

Where's the pic ????

 

[MikeW]

It should say Aleph 2's. Very nice, how about some more picture? How do they sound?

 

[yang]

inside

 

[nbaula]

The amp looks good.What brand of resistor and filter caps did you use? What is the size of the heat sink?
------------------
Arnel

 

[yang]

main pcb and output-relay

More pictures can see from

<a href="http://163.26.193.1/~cheng/audio/aleph-2/aleph-2.htm">http://163.26.193.1/~cheng/audio/aleph-2/aleph-2.htm</a>

My English is very poor,I can only write Chinese,sorry.

 

[yang]

The resistors: Dale 1/4W and 5W

filter caps : Kendeil 4700uF/63V 105¢J X 24

heat sink:36cm X 25cm X 6cm

 

[jleaman]

Great job Looks awsome. Here is a pic of mine.

 

[moe29]

Verrrrry NICE

great job Yang!

 

[Duck-Twacy]

inside

Very nice job, Yang.

That's a torobar inductor isn't? For a Pi filter? Or is it another trafo?

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

I als have one of these babies. Paid 90 euro for it.

 

[Mark A. Gulbrandsen]

Checked out the site but needless to say couldn't read a dang thing. Nice stuff though!!1 An iteresting thing was that there was a comparison between the heatsinks I used .......and the ones he used...but don't know what it said. Perhaps you could elaborate on that for me Yang....? Below is the layout and the sinks I used.
Thanks!
Mark

 

[Raka]

Yang!!!!!!!

Is the led RED?!?!?!?!?
You are going to pass-hell....

Your amp looks very nice, could you learn some "highend" english vocabulary and explain it's sound? I was kidding, it seems that we'll be forced to learn chinese, anyway...

Congratulations!

 

[yang]

To Mark A. Gulbrandsen
The heatsinks you used is good for Class-A Amp.
I really thought over it,only that it seem not suitable to fix the TO-247.

 

[SDF]

Now, I like amplifiers "made in Taïwan"


Congratulation Yang, really beautiful amps.

 

[blank527]

Hi,

Nice amp,
Soon I'll be finishing my amp.
Did some surfing on your site, there are also other Aleph projects on this.. including an Aleph 1.2!! (Not finished so it seems)

http://netcity6.web.hinet.net/UserData/prbstech/

Look for Pass

Greetz,
Remco

 

[Mark A. Gulbrandsen]

Yang,
I didn't have much trouble mounting the TO-247's to the sinks....Although I hand wired my sinks, it did not take that long....a couple of hours per bank prehaps. Using the turrett terminals also made it extremely sturdy. Also, the horizontal positioning of the devices puts the actual semi chip location near the middle of the sink. I have to admit that these sinks work extremely well. See photo.

I think the results are probably better sounding than using the typical output device PCB. I am in the process of doing a couple of more changes to my 2's. First, I am hand wiring the complete PCB circuit on top of a 1/4" thick piece of copper plate using the turrett terminals that I used on the heat sinks. For what ever reason point to point wiring ALWAYS sound better...elimination of the board material itself, and the sometimes marginal copper traces, and complete elimination of the copper foil to solder joints.

I am also installing inductors in the PS to further eliminate the noise on the rails. Its pretty low now, but could always be better. I don't think there is much one can do with an ALeph 2 past this stuff....regulated supply perhaps, but I think the benefits on a class A amp of regulating supplies would be marginal, it may also limit the peak power available.