Waveform Symmetry

W

walters

New member
I notice these different waveshapes and waveform symmetry on varioius amp stages


1.) When the positive cycle clips before the negative cycle, what is this called and what would be causing this?

2.) What causes the positive cycle (sine wave) to be clipped and having a slope/ramp at the top at a angle?

3.) What causes the positive cycle(sine wave) to be slim, and less duty cycle width , but the negative cycle to be fatter,more width and more duty cycle?

4.) What other symmetry waveforms have u guys seen? or notice?
 
Re: Waveform Symmetry

The duty cycle changing is a characteristic of tube amps, and I believe it comes from each side of the wave being clipped separately. It changes as a function of drive, and this affects primarily second and third harmonic distortion levels. I've heard of the duty cycle changing from 50/50 all the way up to 65/35, and then back again as it increases further.

I want to do some experimenting yet, as I've been simulating different solid state clipping methods that emulate overdriven tubes, including their harmonic content.
 
Re: Waveform Symmetry

Can you offer a screenshot to get a better idea of what it is you are seeing?

I have a few folks that deal with such things for work and I've dealt with them in the realm of video and audio editing.

Seeing the analysis of your amp specifically would help greatly.
 
Re: Waveform Symmetry

This is very technical guys... but when I turn my 50 watt valve amp up, I also get clipping and signs and waves. The clipping is me being hit around the head quite visciously by the better half, the sign is either a clenched fist, the bird or the 2 fingers... and the wave is the goodbye wave!
 
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