Harmonic Distortion Prodiles for Different Driverstages driving the 300B

These Profiles are the result of investigating the distortion residuals of various Driver Stages driving a 300B Output Stage (fixed Bais, 400V/80mA) at different Powerlevels, all else being identical. I cannot claim any direct correlation between these measurements and subjective sonics. I must however note that the in general the topologies with lower odd order and high order distortion and with a smoothly decreasing profile where subjectively considered to be the best sounding.