I've got this GK that looked old when I bought it in '82. Back then I used it to drive a 2-15" Peavey Black widow cabinet, that thing cranked! It's one of the first, or at least very old, bass amps made by GK. It has this cool gritty, high, mid-high tone with controls that emphasize boosting or controling the high end of tone. I'd love to try a Rick throught it, probably would crank out some awesome 70's Chris Squier tones. It also has a distortion knob, that has never worked. It also can carry a speaker load down to 2 ohms. In it's history it's been used as a keyboard amp and to drive a PA! I believe it's a '73, the serial number starts with 73, and the GK website, on the innovations page, says the line was introduced in '71. Has anyone else ever seen one of these? Used one?