RCA Radiotron manual typical operations for 2A3 SE A1

output power of 3W5@5%THD

this direct coupled SE do it better and no abrupt distorsion

no immediate distortion when the grid current starts thanks to the direct coupling and the available current reserve of the 6C45Pe triode, at 4W5 the THD is at 5.4% and the distortion on a sinusoid is visible on the oscilloscope at 6W with 7.9% THD