V2/V4 tonal difference for distortion vs non models

[Hangman]

So not only is the preamp slightly changed the power amp is slightly different/ beefed up from the earlier version of the V series family?

its not a beefed up version of the old supply, its just very different. the screen supply is run at a much lower voltage, and has its own winding on the power transformer. the driver/phase inverter is a 6AN8 pentode/triode, with the pentode driving the triode cathodyne phase splitter. Much like the phase inverter from the Sunn. it sounds very muscular, or beefy to me. these are just adjectives I use for the sound of the amp.

my point is that the amps are very different although they share a great deal of similar features.