For example, I had to use the Internet archive of old Peavey webpages (2002 or so) to dig up information about the KB/A 50 which appears to be more or less a predecessor in spirit to the KB2:
As a note aside, if you get a hold of one of those, I consider it pretty likely that the tweeter is due for a ferrofluid replacement. But there also is a KB/A 30 that appears to have speakers of the same size, is of somewhat less power and appears to have no current-time equivalent? There is a KB/A 60 that appears to have quite a different input section, but the power amp/speaker section appears to be similar to KB3?Biamplified 40/10 Watts RMS
Coax 10 inch woofer with 1 inch Ferro Fluid dome tweeter
Channel 1: XLR mic or 1/4 inch line input, level, low & high EQ
Channel 2: 1/4 inch input, gain switch, level, low & high EQ
Channel 3: 1/4 inch input level, low & high EQ
Rear panel monitor input with level control
XLR balanced line output
Global effects send & return with 1/4 inch jacks
1/4 inch jacks
Compact size and lightweight design
Unpacked Weight: 33.50 lbs.
Unpacked Width: 15.3750 in.
Unpacked Depth: 11.3750 in.
Unpacked Height: 17.75 in.
Packed Weight: 37 lbs.
Packed Width: 17.25 in.
Packed Depth: 13.3750 in.
Packed Height: 19.6250 in.
Lots of headscratching here, and particularly finding out the speaker sizes is rather tricky for those previous models: even if there is a manual, you mostly depend on the enclosure size getting specified and then trying to determine speaker size from the pictures.
Is there anything like a data base containing data like the above for older models?