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-   -   Aleph J front end as pre amp??? (http://www.diyaudio.com/forums/pass-labs/205662-aleph-j-front-end-pre-amp.html)

audionut 31st January 2012 11:27 AM

Aleph J front end as pre amp???
 
I've been building a set of JFET BOZ preamps for a bi-amped system...

As I have been reading about the jfet boz, I see that they have high distortion figures in the 2 to 3 volt range. To make up for some filter losses, I need to swing some slightly higher voltages.

It seems that the aleph j front end could be adapted to become a pre amp...After all, the Aleph J front end swings, I guess 24 volts or so and the Aleph J has small distortion.

Is this a viable idea??

I haven't heard the JFET BOZ yet...maybe I will be happy with it as it stands...

Zen Mod 31st January 2012 01:49 PM

you need entire Aleph to have it functional as gain stage
it was already made in several ways
you can use IRF510 as output , with few changes to have , say , ~ 30-40mA of Iq.... and there is no need for Aleph CCS - plain CCS ( without modulation ) is sufficient then

but - if you ask me - BA3 FE is probably better solution in this moment

qusp 2nd February 2012 04:32 AM

Quote:

but - if you ask me - BA3 FE is probably better solution in this moment
yes indeed, if i were building a pre or a headamp based on pass at the moment it would definitely be BA3 based, it looks like a fun design and so flexible for future experiments. for example if you found for whatever reason you nolonger needed a pre, you could simply tack on one of the power stages and i gather there will be more to come, easy to add your own too. i think its a great idea and i'm keen to hear the BA3 beast Nattonrice has planned


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