Excuse my obvious ignorance, but recently I have come accross a number of 2stage single-ended designs which somewhat mimic the basic concept of the Aleph.
The important difference between such designs is what appears to be an active bias element (Q104 / R109 /R110 on the Aleph 3 schematic)connected between -V and the signal from the diff pair to the gates of the IRF244's.
I have no intention of building an Aleph as they do not satisfy my requirements at this time, but I am curious to know why this biasing element is used in the Aleph? What advantages does it offer over more simplier designs? Is it because the Aleph 3 uses all NPN devices in the output, while others use PNP/NPN?
Could this be the reason many commercial reviewers have claimed a significantly regressed midrange from Aleph amplifiers.
I know the answer is going to be really obvious and I'm going to feel like a fool for asking, but I can't see the woods for the trees on this one. Can somebody enlighten me please?
The important difference between such designs is what appears to be an active bias element (Q104 / R109 /R110 on the Aleph 3 schematic)connected between -V and the signal from the diff pair to the gates of the IRF244's.
I have no intention of building an Aleph as they do not satisfy my requirements at this time, but I am curious to know why this biasing element is used in the Aleph? What advantages does it offer over more simplier designs? Is it because the Aleph 3 uses all NPN devices in the output, while others use PNP/NPN?
Could this be the reason many commercial reviewers have claimed a significantly regressed midrange from Aleph amplifiers.
I know the answer is going to be really obvious and I'm going to feel like a fool for asking, but I can't see the woods for the trees on this one. Can somebody enlighten me please?