different parts to get the same sound.. the voltage mod is just gives a similar mojo to the og amp.. tube amps have a voltage that they work best at it's different for each amp. and using a variac you can set that voltage.. the modern protection circuit in the amp don't allow that. 112-117 is a sweet spot for a lot of tube amps. if want to take advantage of the power tube distortion use a attenuator. between the amp and cabinet.Well there's way more differences than just that. The preamp and driver tubes are different. Different versions of the same thing, since 12DW7's are just half 12AX7, half 12AU7, and 12BH7's are half a 12AU7. But they are different. Still, at the end of the day, the differences aren't important since they sound the same.
Honestly most bassist won't go to all this trouble. but I'm on the nerd side. and do lots of research. lol
if I really want to mod an svt-vr I would take out the second channel to save on weight. put the high pass filter in it. put some cyro tunsol tubes in it. give it auto biasing too. figure out a quieter fan too.
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