JSB-20 HF Portable
The JSB-20 is a self contained 1-10Mhz portable sideband radio for Marine and Commercial SSB use.
Lately some have been finding their way onto the used market, and they make handy 40 & 75 meter radios for Amateur use.
The primary resource for information on these radios can be found here:
The Yahoo group contains file archives with manuals, schematics, mods, accessory and parts database, etc.