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Smothing signal (similar way to vacuum tubes, analog)

DSP related issues, mathematics, processing and techniques

Re: Smothing signal (similar way to vacuum tubes, analog)

Postby martinvicanek » Mon Jun 29, 2020 6:55 pm

k brown wrote:The other factor is the fundamentally different way that transistor circuitry clips - it tends to generate more THD (and a lot of ugly in-harmonic distortion) just below clipping, then clips suddenly and with nasty-sounding hard edges to the clipped waveforms. Tubes tend to generate much less THD (and that, mostly euphonic second harmonic distortion) just below clipping, then clip more gradually and with softer, rounder edges to the clipped waveform, until the clipping gets to gross levels. As a tube amp approaches clipping, the sound starts to become rather benignly compressed; as an average SS amp approaches clipping, the sound becomes rather ugly.


Yes, I agree, and that is the origin of the prejudice that solid state amps are no good for guitar (or bass). Of course you can use solid state circuity to implement a soft distortion (germanium diodes for example). But once people are convinced that solid state sounds crappy, they are stuck with it.
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Re: Smothing signal (similar way to vacuum tubes, analog)

Postby k brown » Mon Jun 29, 2020 7:02 pm

Yes, Nelson Pass caused quite a revolution with his 'soft clipping' for SS amps.
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