This video is a comparison between a vintage, early '70s Ampeg SVT and the new Tech 21 VT Bass 1969 bass amp heads. This shows the difference between 285 all-tube watts and 345 solid state watts. The 23-lb. VT Bass 1969 not only emulates the characteristics of the 85-lb Ampeg, it actually slightly exceeds the stage volume (SPL) of the SVT. BTW, the cabinets are exactly the same except for the grills.