On Mon, Oct 28, 2002 at 10:37:18PM +0100, Tim Goetze wrote: > i'm sure frequency responses and Vin/Vout mappings for common > amp tubes (EL34 comes to mind, too) would be very helpful, but > can i ask you to take a look at > http://quitte.de/driven.gif > first? > > it shows my badly-driven fender amp's line output (top) vs. the sine > wave it was fed at the same time. i'm wondering how come the output > overshoots every time the input crosses zero. trying to model this > behaviour into a waveshaper, but i'm a bit lost on the physical laws > that rule here. >
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. Frank. -- +---- --- -- - - - - | Frank van de Pol -o) A-L-S-A | [EMAIL PROTECTED] /\\ Sounds good! | http://www.alsa-project.org _\_v | Linux - Why use Windows if we have doors available?
