Steve Harris wrote: >That is a side effect of class B amps IIRC. I would have though that >preamps would be class A, but maybe not.
they are, afaik. you're right, it's a property of class B. still my amp's preamp stage shapes the lower half differently (less) than the top. >> i'm still trying to model the hard-driven valve in the time >> domain. the more i look at it, the more i think the 'building of >> potentials' i've tried to describe comes near it. though it would >> be nice to base it on hard facts about valve amp behaviour, too. > >'building of potentials'? Are you refering to your sinc summation idea? >Its a nice idea, especially as you get anitaliasing for free, but I think >it will be hard to turn a hardish clipping shape into a sum of sincs. no, this is the other idea that would try to model a simple wave shaper (pushing energies and so on). the sinc idea is reserved for dire emergency situations, it's not really gentle on the cpu and tough to get right. >> interestingly, the sine, shaped by the hard-driven amp, looks >> a lot like the plots of 'ion conductivity' and 'Aktionspotential' >> from human heart analysis. > >Woooosh. [that was the sound of that going way over my head ;) ] if you could see those plots, you'd know exactly what i mean. in fact they look almost exactly like one half of a sine cycle after it's been mistreated by a 12ay7 valve at high gain (quitte.de/wave.ps.gz). tim
