Aleph 5 playing...

[Lucas_G]

Try again:

[Edwin Dorre]

A few questions;

How long was your amp running when you measured the your 47 degrees?

More than a hour?

What was the ambient temperature in your room?

What did you pay in euro's for the heatsink?

Thanks,

Edwin

[Lucas_G]

Originally posted by Edwin Dorre
A few questions;

How long was your amp running when you measured the your 47 degrees?

More than a hour?

What was the ambient temperature in your room?

What did you pay in euro's for the heatsink?

Thanks,

Edwin

Hi Edwin,

The amp was already running for a couple of hours.

The ambient temp in the room was 20 degrees Celsius.

I paid appr. 60 Euro per heatsink.

They also sell a 300 mm long model, called KL 271. It is not much more expensive, and it has a C/W of 0.11

Regards,

Lucas.

[wuffwaff]

Lucas,

nice amp you´ve build there! I like the way it is build using all three dimensions. Most amps are more 2 dimensional in there layout (not meaning that they sound flat or so......).

Do you think the plant will survice for a long time?

William

P.S. how much ripple do you have and how much voltage do you loose over the chokes?

[Mark A. Gulbrandsen]

" Since I too have 4 Ohm speakers I decided to use the resistorvalues of WuffWaff that he has posted in another thread. This leads to a higher bias. "
__________________________________________________ __

Can some one lead me to this thread? Thanks..... Did a quick search but can't find it...
Mark

[Lucas_G]

Originally posted by Mark A. Gulbrandsen
" Since I too have 4 Ohm speakers I decided to use the resistorvalues of WuffWaff that he has posted in another thread. This leads to a higher bias. "
__________________________________________________ __

Can some one lead me to this thread? Thanks..... Did a quick search but can't find it...
Mark

Hi Mark,

Wuffwaff made there the following comment:

"Since the last reports I changed the trimmers for R19 and R21 with resistors (49k and 390R) so now it runs at 2.4A bias and about 63% ac current gain (about 6.7A peak)."

These are values that I used too.

Regards,

Lucas.

[Lucas_G]

Originally posted by wuffwaff
Lucas,

nice amp you´ve build there! I like the way it is build using all three dimensions. Most amps are more 2 dimensional in there layout (not meaning that they sound flat or so......).

Do you think the plant will survice for a long time?

William

P.S. how much ripple do you have and how much voltage do you loose over the chokes?

Hi William,

Thanks for your praise! This 3 dimensional way of building was neccesary to get all things into such a compact space.
Apparently it makes it difficult for some to understand how it is set up...

The plant would not survive, I guess, and nor would I when my wife would found out...

I don't know how to measure ripple. I don't have a scope.
I tried Duncan's PSU design tool and it showed a very low ripple.

The voltage drop over the chokes is less than 1 Volt.

I am also amazed to see a ratio between 30 VAC / 39 VDC of 1.3
Much higher than I had expected.

Kindest regards and good luck with you Aleph-X project!

Lucas.

[Duck-Twacy]

Glad that the Seiferts are truthfull about their Cw value, because I have a pair the 300*200*83 mm KL271 for my Alpeh5s. Notice you also have some "spots" (beschadegingen) on them.

My youre amp is ugly btw Maybe I can make an even uglier one

PS The Seifert KL271 200 mm high costs 65 euro excl. taxes

[Lucas_G]

Originally posted by Duck-Twacy
Glad that the Seiferts are truthfull about their Cw value, because I have a pair the 300*200*83 mm KL271 for my Alpeh5s. Notice you also have some "spots" (beschadegingen) on them.

My youre amp is ugly btw Maybe I can make an even uglier one

PS The Seifert KL271 200 mm high costs 65 euro excl. taxes

Hi Duck,

Yes, there were already some spots on them when I received them.
I guess you can can fix these with the help of a permanent marker lik an Edding...

I will do that only after finishing the outside of the amp (concealing what you seem to be finding utterly ugly ).

Regards,

Lucas

[Duck-Twacy]

Here is a pic of my wannabe Aleph5 (still have to start building the mechanical part). It will be a dual mono case btw. Size will be 480 * 310 * 310 mm (on the outside ofcourse). It will have 2 layers. Below the elcos and conductors. Above it the trafo's (in the middle). PCBs at the sides against the Seiferts of course.



I will not be using a extra face plate or something, only L an T alu profiles.

Damn stains (fingerprints) on the aluminium.