eyeslikefire said:
This is funny. Suddenly, the B-2R magically has 450WRMS!

This is an error. Check the
Ampeg B-2R Page for the actual (or rather
claimed) output figures. Most owners I know share the belief that these ratings are probably rather exaggerated already without MF upping the claimed output
another 100WRMS.
The B-2R is the identical amp as the
SVT-350H, which resides in a fake SVT housing, BTW. I picked up a new SVT-350H for $289 at GC because an employee broke off the tips of a couple of the EQ faders unpacking it. That's about all the amp is really worth. A lot of folks use these, but the used market for B-2Rs and
SVT-350Hs is around in the $300-$350 range. These are OK heads, but overpriced when new.
Speaking of Ampeg's interesting proclivity for packaging the same guts in different skins, I just found out that the rather mysterious and somewhat rare
V-50H head shown here is in fact nothing but the insides from the late EL34 version of the vintagy
Superjet in an entirely different oversized "heavy metal" case. For all the flimflam, it's a nice sounding amp anyway.