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I would like to be corrected if I am wrong, but AFAIK tube amps do not change FR, but just add distortion at all frequencies but particularly at the lower ones? This means that if I run a 50Hz wave the resulting output would be either distorted at the same wave or/and its harmonics. This leads me to think a digital filter can give out a 'tubey' sound by fudging with waveform with either jitter or power?
Someone please educate me on tubes if my understanding is wrong.
I think I'd misunderstood your previous post. I thought you were suggesting that the main audible effect of added nonlinear distortion was on the frequency response, i.e. a linear effect. It's clear now that wasn't what you meant, so obviously I'd misread you. And yes, DSP can be used (and is used) to emulate the effects of various tube distortions.
To your other point about the distortion effects of tubes being more pronounced at lower frequencies, that depends. I'm no expert on tubes, and although it's not possible to generalise, I'm sure certain tube designs work like this.