Quote:
Originally Posted by Forte /img/forum/go_quote.gif
BTW what is the amp, how does it sound and how long does it run for off the batterys?
|
It's my three channel class A folded cascode amplifier. It's powered by 8 AAA's. The current draw is somewhere around 100 mA and the batteries are 950 mAh, so I guess something like 5 - 7 hours. I actually have several of these with different concepts - one JFET input cascoded folded cascode, one JFET/bipolar CFP input, one bipolar input, one AD797 clone, one "straight" with JFET input. Now I'm figuring what to do next, probably cascoded VAS. All of them have bipolar input ground channel amp (except the CFP), because JFET input amps in all stages sound too grainy.
They all sound good
The bipolar sounds a bit recessed in the mids, like most bipolar amps, not too far from LM4562. Very sweet dark and non-fatiguing sound.
The CFP input has a "deep" and full sound with more bite and the typical "JFET-presence". It has some kind of glow to it, and it's the most involving one, I think, but I'm not sure yet.
The cascoded input stage is very detailed, has the best bass slam but could sometimes be a bit hard.
"AD797" is very clean. It gives the impression of less distortion, which also has proven to be the case.
The standard JFET input is just neutral with no fuss, but without any distinctive virtue like the ones above.