[Home] [Om Magnus] [Länkar] [Projekt] [DIY Audio]

Magnus' Aleph 30 page

This is the story about my Aleph 30, which I'm currently building (July 2002). This far I've done this:

Fabricated PCB's
Drilled a lot of holes
Matched the IRFP240 and IRF9620 transistors
Mounted all the components on the PCB's
Mounted the PCB's on temporary heatsinks
Tested the PCB's, listening to music
By the way, here is the service manual and the schematics

I found the PCB layout on www.diyaudio.com. A whole pile of credits to Panos in Greece for his PCB layout.

On the 15'th of october (2002) I did some measurements on my Aleph 30. I thought it was getting really hot, and I got some numbers to confirm that I have the bias setting a little bit too high (see pic below).

A friend of mine (Urban Svensson, a.k.a UrSv on the DIY audio forum) gave me the advice that I could use some aligator clips and a 470KOhm resistor over the R19 (see the schematics). I did, and whoa... Look here:

No problem now! The left channel is not as hot anymore, and I'm a happy camper.

Pictures