Are there differences in the CL/VR and the Classic or the original?? I currently use an amp at 850 watts, but tube power is completely different
Okay...lemme try and help out a little. For current Ampeg all tube amps, you've got:
Ampeg SVT CL: Very similar to an original SVT, but it's got an added gain know which makes it easier to get the amp into overdrive without cranking it up to deafening levels.
Ampeg SVT VR: It's is supposed to be an homage to the original. Cleaner sounding overall than the CL, but will get nasty if you crank it up.
Ampeg SVT-II Pro: Rack mount version of the CL with an added 9 band graphic EQ for additional tones.
Heritage SVT CL: I'm honestly not too sure on what the difference is between this and a "regular" CL. I guess these are still made in the US?
Heritage B15: Portaflex (fliptop) combo, 30 watts. It's a great studio amp, although people do use then live. I think the Heritage series is supposed to be very close to the original B15 design. They are also crazy expensive.
As for tube watts being different, a watt is a watt is a watt. Someone else can come and explain why tube sounds are perceived as louder. It's something to do with harmonics. A 300w SVT will do you more than plenty fine.
For discontinued stuff, you've got:
SVT: The original. THere are quite a few versions between all the different owners. You'll see Magnovox era, SLM era, etc.
SVT II: Rack mount version of original SVT, with added 6 band graphic EQ. Usually referred to as an SVT II non pro.
Skunkworks SVT: SLM era SVT, made using the original circuit boards, and as close to specs as their specialty division could make.
B15R: 60w/100w version of the B15
SVP-CL: All tube preamp of the SVT-CL
SVP-Pro: All tube preamp of the SVT II Pro
SVP-BSP: The Billy SHeehan Preamp
SVT-IIP: The preamp of the SVT II
SVT-300: Rack mount, all tube power section of the SVT II
I'm sure I'm forgetting a few models, or some info...but this is the gist of it.