ALEPH-X - The Monster

[Coulomb]

So Kris, the Aelph X(V2) 24 Fet version has a power rating into 8 ohms of?

Regards

Anthony

 

[jleaman]

wouldn't it be 200 watts since the first one has 12 fets per channel. and in 8 ohms it is 100 watts and the other one has 24 fets per channel wouldn't it be double. the out put power. ?

 

[UrSv]

wouldn't it be 200 watts since the first one has 12 fets per channel. and in 8 ohms it is 100 watts and the other one has 24 fets per channel wouldn't it be double. the out put power. ?

The number of FETs does not alter the output power. The rail voltage does.

 

[jleaman]

is that only for class a amplifiers or all amplifiers in theory ?

What does adding 12 more fets have affect to the amplifier for ?

 

[wuffwaff]

Jason,

the only need for more fets is to reduce the dissipated power per fet.
Normally you would like them to dissipate around 20-30 watts to be on the safe side.
So if you want to build an 100 watt Aleph-X (into 8 ohms) the dissipation per channel will be around 200 watts (voltage and bias chosen to give 100 watts 8 ohms as maximum).

200/20 gives 10 fets
200/30 gives 6,66 fets

Since both are a bit difficult to build an Aleph-X you could choose 8 for 25 watts/fet or 12 for even less dissipation per fet.

So with 24 fets you can dissipate between 480 and 720 watts. The output power this gives is between 240 and 360 watt into the impedance you choose by setting bias and rail voltage.

william

 

[Coulomb]

Which still leaves my original question some what un answered. Is the Aelph-X ver 2 Kris has designed going to run at a higher bias the way the cicuit is currently laid out?


Regards

Antrhony

 

[wuffwaff]

Anthony,

there is a 50k pot in the active current source where you can adjust the bias as you like!

william