Bassman 70 Amplifier Owner's Manual. Six pages, does not include a Warranty card, schematic or a complete picture of the amplifier. Front and rear panel layouts and functions are presented. There is no date on this manual but it looks very similar in design to other late '70s-early '80s Owner's Manuals in our inventory. The best information I have on the Bassman 70 is that it was produced from 1977 until 1983.