modify aleph 1.2

[audiodan]

Hello!

Looking at building Nelsons amp A1.2

the question or problem is I dont need 200w of power, Im thinking more 100-120w. This should save on building and running cost.
So Is it as simple as lowering resistor 56.2k?
and also remove some output fets.?

The thing is Im looking at running low sensitivity speakers and this is one design which should work.

Any advice is welcome
Cheers

[Gyuri]

No, it is not so simple.
Why not build an aleph 4?

Gyuri

[audiodan]

Thanks Gyuri

"The amplifier is stable into any load impedance or reactance including a direct short, but does
not increase its power rating with reduced impedance. Below 4 ohms, the output of the
amplifier will be proportional to the load impedance."

Looking at a amp which does not have this character.
my thinking says, with a speaker the impedance drops as the freq decreases, so with rated power increasing with reduced impedance this gives more bass

[sakellogg]

hello, i am kinda new here. i have been lurkin in the back for awhile learning all i could.
im not sure i understand the Z dropping and getting more bass question... however i think, (and maybe someone with a higher edumacation can conferm) P=IxE so just cause it has the capability, till you turn it up or music calls for it the voltage will be what it is at that freq. i could be wrong....
however i built a 1.2 i love it. i am in the final stages of tweaking the design, and making the second.
if running the amps all the time from the wall @ 500+ Watts is what you are concerned about, i may have a solution.
if not the i have some info on the alpha 2 that i can send email to you. i think it is just like the 1.2 only 100w.

also....can you spell check on the replys?
nevermind found it. dropped on my head as a small child.

[Nelson Pass]

Originally Posted by audiodan

Looking at building Nelsons amp A1.2, the question or problem is I dont need 200w of power, Im thinking more 100-120w. This should save on building and running cost.

Build the Aleph 2, a better choice, I think.

[audiodan]

Thanks Mr Pass!

Any info is nice on the aleph 2

Cheers Sakellogg

[eyoung]

hola Y'all

Info on anything, use the search button at the top right of page. (how to cook chilli on a class a amp???) all kidding aside there is a wealth of info already discussed in this forum. The search button is your friend...

Regards, Elwood

[sakellogg]

i got lots of info from this link
http://www.penguinlovers.net/audio/aleph2_proj.html
and
http://www.facstaff.bucknell.edu/esa...s/aleph-x.html
hope that it helps. did for me, i printed and read them allot.
like elwood said float around here, some of these guys have forgot more than ill ever know. may not be the case with you but as i said before head dropping and all..

[xcel]

If you need the service manual for the Aleph 2, I can help.....