Steve Harris wrote: >On Tue, Oct 29, 2002 at 12:18:23 +0100, Frank van de Pol wrote: >> looking at the distorted signal it look to me like an amp that is clipping, >> but it's power supply can't maintain the voltage (eg. relatively high >> impendance on the powersupply/series resistance). While +ve or -ve side of >> the output pair is used it drains the capacitor from the power supply, hence >> the exponential slope from 'spike' till drop. > >Aha, great. I was thinking about how to rewrite the valve rectifier, and >it occured to me that my revised algorithm would output something that >looked like that in extreme cases. > >That means 1) we're nearer to Tim's shape, and 2) my alg. is more or less >correct 3) we may not need to mess about with chebies.
1 + 2 + 3 = great. :) i've uploaded another image showing how the line output from the amp changes as the incoming sine increases in volume: http://quitte.de/3x-driven.gif admit i hope that frank's explanation holds, and that the valve_rect can be made to produce similar shaping. tim
