I cant read the knob labeling in your pic, but just to avoid confusion; here's a pic of a real Ampeg SVT V9:
The V9 was the 6-string guitar variant of the SVT with additional Reverb & Distortion knobs. Many of the conventional SVT amps Intended for bass guitar ended up having 'V9' labeling on the back side, but they were not actually a V9 variant.
I assume the reason for this situation is that Ampeg printed lots & lots of the V9 rear covers, and when these comparatively rare V9 variants did not end up selling as well as expected; Ampeg simply used them up installed on the normal SVT's.