Aleph 1,5 ?

[adusson]

I have built two monoblocks wich is something between Aleph2 and 1,2.
Works really great and sounds wery good.
Each monoblock uses 600W continosly(2,62A 230V), rail is +-51V, so the get really hot!
Capasistors are Rifa 4x100 000uF and 18pcs. irfp 240 in each amp, trafos are an 11kg 800VA Toroid.
Here is what they look like:

 

[valo]

nice work, have you measured the temperature?, I measure about 70 degrees on the transistors on my diy Aleph 5

 

[jleaman]

monsters!

 

[Zen Mod]

very nice - but you need at least another one 800VA Donut per monoblock ;

800VA is too small for 600VA consumtion

 

[tortello]

Congratulations,
I like your "monsters" very much, and your Triumph ST too!

(even if it is not a Monster!) : D

Marcello

 

[adusson]

Ok, but I think these trafos does the job anyway, here is a link for some more info about the transformers...

https://www1.elfa.se/data1/wwwroot/webroot/Z_DATA/05613997.pdf
and
Toroidal core transformer for audio amplifiers 800 VA - ELFA tehnikapood

I have compared with other transformers wich i 1000VA an the weight i only around 7kg, mine is 11kg...

 

[Gyuri]

Very good implementation. I like it because of that Aleph configuration, because ( availing itself of a computer technology terminology) can be scalable configuration.
I mean you build the size that your cooling flange and your power-supply unit allow out of it. Fundamentally sure money question.

It's mine:
http://www.diyaudio.com/forums/pass-labs/56454-my-good-old-new-aleph.html

Gyuri

 

[adusson]

Very good implementation. I like it because of that Aleph configuration, because ( availing itself of a computer technology terminology) can be scalable configuration.
I mean you build the size that your cooling flange and your power-supply unit allow out of it. Fundamentally sure money question.

It's mine:
http://www.diyaudio.com/forums/pass-labs/56454-my-good-old-new-aleph.html

Gyuri

Thank you for your reply, your amps could almost drive a nuclearplant...

 

[osscar]

Yes, these are very good transformers, silent as the tomb, and no vibration. It was quite expensive ...

Your amps is also perfect. I also thought about building a new amplifier just can not decide BA-1 or Aleph

 

[Zen Mod]

 

[adusson]

Ok, intresting reading Zen Mod...but,
If I use an amperemeter and measure what the amp consumes in 230V.
I get the readings 2,62A.
Then I calculate 2,62x230=602,6
then it consums around 600W, am I wrong?

 

[Zen Mod]

I didn't say that you're wrong ;

all I say is - you need greater margin between power consumption and max power of your xformers ;

there are several reasons , and Papa already explain them better than I can .

you'll gain not just in peace of mind , but primary in sound - you'll have less ripple .... and even if present one isn't audible , every gain in that area will be audible as - roughly said - new layer of details and blackness

make simple test - move one xformer (along with Graetz bridge(s) ) from one monoblock to other ; parallel 2 xformers after Graetzs , and listen ;

let your ears be the Judge , not anyone else

then you'll have 1KVA of margin , not just 200VA

 

[adusson]

I didn't say that you're wrong ;

all I say is - you need greater margin between power consumption and max power of your xformers ;

there are several reasons , and Papa already explain them better than I can .

you'll gain not just in peace of mind , but primary in sound - you'll have less ripple .... and even if present one isn't audible , every gain in that area will be audible as - roughly said - new layer of details and blackness

make simple test - move one xformer (along with Graetz bridge(s) ) from one monoblock to other ; parallel 2 xformers after Graetzs , and listen ;

let your ears be the Judge , not anyone else

then you'll have 1KVA of margin , not just 200VA

Ok, thanks for the info, I will try with two transformers later.

 

[adusson]

Aleph P

I must allso post some pictures of my remote controlled dual mono Aleph P.
The silver enclosure under the preamp is the powersupply...
Im wery happy with the sound of the combo.

 

[adusson]

nice work, have you measured the temperature?, I measure about 70 degrees on the transistors on my diy Aleph 5

Hi valo, no I havent mesured temp yet, dont have termometer, but my friend has, so I have to ask him...