BUMP: I took the Viper chassis out today to inspect the innards after I noticed the input jack is pretty floppy. I tightened the jack nut, but all that did was make it harder to put the plug in...still a bit wobbly when fully inserted. Pretty ingenious design really, the amp chassis just sits on a shelf in the back of the speaker cab. I shoulda taken pix, that would help you understand what I mean.
Anyway, as i suspected, the jacks are those 'boxed-in' kind that attach directly to a pcb. Awesome...nothing's easy sometimes.
So...while inside, I wanted to see what kind of tubes were in there, because they sound AMAZING. I don't want to change them, because they sound that good. First, they are not easy to change. You have to remove the little tiny reverb tank just to reach inside, and it's still not easy. I flashed my light in there, to get a good look at the print on the tubes - one is encased in a shield with a ground wire attached, so I'm trying to read the other one. It's got green writing, kinda Old English looking font...can't make it out....the writing is on the far side of the tube.
I end up taking the tube out, and I can honestly say that I don't have any of these tubes in any other amps, nor have I ever. The green print says: Baldwin Pianos and Organs
I take the ground shield off the other one and pull it out; yup, another Baldwin. Apparently, these organ tubes sound great in a Viper. I think Kim landed a box full of Baldwin tubes a while back.