My good old-new Aleph

[Gyuri]

Hello everybody !!!

I would like to introduce my Pass Aleph to you.
It is working since more than four years, but I only managed to make photos now. Many thanks to Mark Finnis, who inspired me
building my Aleph Power Amplifier, and the same to the One and Only.

 

[Netlist]

What Aleph is it?
Do you have more pictures? Any sound impressions?

/Hugo

 

[Gyuri]

In my definition this is an Aleph 9, because it has 2*9 FETs per side, with 1 Ohm source resistors, 2*47 V rail voltage, 3KVA toroidal transformer, 4* 100.000 uF Capacitors with choke. It consumes approximately 500W power/channel. The heatsinks temperature is 35°C above ambient. It has got a weight of 110 kg's (about 240 lbs). Now take a look inside:

 

[Gyuri]

From another view:

 

[Bricolo]

From another view:

this one looks like a factory

 

[Gyuri]

This is the soft start circuit with series current limiter resistor and solid state relay.

 

[MikeW]

Very nice. That's a big one.

 

[Gyuri]

Yes, this is a factory. A sound factory.

 

[Dennis Hui]

From another view:

I love that shot! Looks like a visual effects
model.

And that's one heavy Aleph amp. No wonder
it has casters.

Nice...very nice.

Dennis

 

[Duck-Twacy]

Thank you, I started my Aleph5 (or should I know say Aleph6) two years and 4 months ago, so I still have some time left

 

[Gyuri]

I tested my car's loudspeakers with my Aleph part I.

 

[Gyuri]

I tested my car's loudspeakers with my Aleph part II.

 

[Gyuri]

The Choke between the caps.

 

[Gyuri]

The back side:

 

[Gyuri]

My retired Velleman K4040 and K4100 sitting on the top of the pretender.

 

[Gyuri]

This is my amp's actual schematic:

 

[Gyuri]

About the sound

My amps evolution:
Firstly i built an Aleph 4 Based on Mark Finnis's design.
Secondly I upgraded it to an Aleph 2 changing the source resistors from 1.5 ohm to 1 ohm.
Finally I changed the number of FETs from 2*6 to 2*9.
The sound is the hardest to describe, not only because my poor English. With increasing the number of FETs and current, the bass is got stronger (I like it.) but the mids and highs became less fluid and airy.
The greatness of Aleph designs is not only in their simplicity, but also everybody can find the way he likes it.

In comparison with my old K4040 its sound is more transparent airy and tight.
while the K4040 is reassuring but we can say it's also boring.
The bass is better, even the Aleph 4's.

 

[Nelson Pass]

Very, very nice.

 

[Gyuri]

Thanks, Nelson.

 

[lineup]

Hello everybody !!!
I would like to introduce my Pass Aleph to you.
It is working since more than four years, but I only managed to make photos now.
Many thanks to Mark Finnis, who inspired me building my Aleph Power Amplifier,
and the same to the One and Only.

Very, very nice.

Gyuri.
What a project!

I mean .. take a look at the C-L-C power supply filter.

Capacitors SPRAGUE BEER Cans!!!
http://www.diyaudio.com/forums/attachment.php?s=&postid=632259&stamp=1114957809

The L-Inductor in C-L-C filter!!!
http://www.diyaudio.com/forums/attachment.php?s=&postid=632281&stamp=1114959621

This is one amplifier I reallywould like listen to.
Performing heavy Solid rock music.

Lineup