I have a few manuals that I have scanned from my own original copies. I've made them available here because I thought they were better scans than copies found elsewhere, different versions, or just not available at all. Right click on the PDF icon and Save as... to your own location.
PDF icon links to the manual. Text links to a relevant page on this site.
Cen-Tech P77772 DMM owner's manual
EICO 950b capacitance bridge owner's manual in PDF format
Heathkit GD-1B grid-dip meter owner's manual
Hickok 153 Trace-o-Meter owner's manual and 
high-res schematic
Jackson 9-pin Socket Wiring instructions for Models 636 and 637 Tube Testers
King-Hinners Model A neutrodyne owner's manual
Revere Tape Recorders Models T-100, T-200, T-500, T-600 owner's manual with schematic (not yet available)
Silvertone Neutrodyne instructions
Triplett 850 VTVM owner's manual
Webcor 210 reel-to-reel owner's manual
Webcor 2711, 2712, 2791 and 2792 Royal and Royal Coronet reel-to-reel owner's manuald
Webcor Musicale Fonograf owner's manual and Musicale/Ravinia phono cartridge instructions
Webster Duo-Choke B-C battery elminator advertising flyer
Weston 785 Circuit Tester instructions
Wollensak 5740 reel-recorder owner's instructions
Zenith Portable (Chassis 6A19) owner's manual
Zenith Super-Transoceanic 600 Series owner's manual
This isn't a radio, but I have no better place to put it at the moment:
Technics SX-KN200 / SX-KN400 electric piano keyboard Owner's Manual Volume 1, Volume 2, Volume 3
For more manuals, look on my Links page.