Hello,
my .02
1- there are no perfect supplies or audio amplifying circuits
2- Simpler is usually better
3- As far as possible, design the supply so that it really does not even care that there is a amplifier circuit attached to it, make its output impedance close to even across the frequency spectrum (as far as possible)
4- Design the circuit so that the change in current drawn from the supply is small so you reduce supply modulation
5- In the circuit design, pay close attention to the signal and supply ground for each stage, the loading of the preceding stage into the next and try to run devices conservatively enough for long life.
There is a large tendency to mythologise the whole aspect of audio design and it needs to be brought down to earth a little. It serves our egos well and may help sell a couple of preamps but lets get real, none of us was nominated for the peace prize because of our phono stage.
Thom has it totally right, does the thing get out of the way so you can understand what the composer/artist/singer was trying to do. The rest is BS. There is no supreme topology.
Even the person who brought up Tom Evans should realize that Tom started Acoustic Precison on the basis of audio circuits supplied by very high speed regulators and has now come full circle by using triple choke regulation in his latest amps.
I try my hardest to not post to the forums anymore because it always seems that someone either is spoiling for a flame war or has a dogmatic view that they wish to evangelize.
I think Thom is making an attempt to change the tone a little and I thank him.
my .02
1- there are no perfect supplies or audio amplifying circuits
2- Simpler is usually better
3- As far as possible, design the supply so that it really does not even care that there is a amplifier circuit attached to it, make its output impedance close to even across the frequency spectrum (as far as possible)
4- Design the circuit so that the change in current drawn from the supply is small so you reduce supply modulation
5- In the circuit design, pay close attention to the signal and supply ground for each stage, the loading of the preceding stage into the next and try to run devices conservatively enough for long life.
There is a large tendency to mythologise the whole aspect of audio design and it needs to be brought down to earth a little. It serves our egos well and may help sell a couple of preamps but lets get real, none of us was nominated for the peace prize because of our phono stage.
Thom has it totally right, does the thing get out of the way so you can understand what the composer/artist/singer was trying to do. The rest is BS. There is no supreme topology.
Even the person who brought up Tom Evans should realize that Tom started Acoustic Precison on the basis of audio circuits supplied by very high speed regulators and has now come full circle by using triple choke regulation in his latest amps.
I try my hardest to not post to the forums anymore because it always seems that someone either is spoiling for a flame war or has a dogmatic view that they wish to evangelize.
I think Thom is making an attempt to change the tone a little and I thank him.