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I don't think there's anything new in this article. They're actually talking about the difference between Class A and Class AB amplifiers, most old valve amps b
by ris 10y ago
I don't think there's anything new in this article. They're actually talking about the difference between Class A and Class AB amplifiers, most old valve amps being of Class A design and the trend with solid state amps being towards Class AB. Depressing that this made phys.org.
- bucma 10y agoVery few classic tube guitar amplifiers were Class A, the vast majority being AB. Really the only ones that were class A are single tube amplifiers like the Fender Champ. The Vox AC/30 that everyone thinks is class A is just cathode-biased class AB. The Marshalls that Hendrix played through, the Fenders that Steve Ray Vaughn used, and the Boogies that Santana is known for, all class AB. Sure, class A does tend to have more even-order harmonics, compared to AB, but even class AB tube amplifiers have more than any solid state one.
- ris 10y agoSo... did these tube AB designs have particularly asymmetrical lobes to their gain curves? Otherwise I don't see where these even order harmonics are getting introduced.
- crmd 10y agoYes a bit due to asymmetry in the phase inverter circuit driving TD push-pull, but mostly because the odd harmonics are naturally cancelled out in the output transformer.