Used SWR SM-400
This is the original super modern amp with exceptional variability and bullet-proof construction. The first store in Seattle to carry SWR was Seattle Music and we used to sell a ton of these amps along with the Goliath cabinets. After that, Bass Northwest became a dealer a were their #1 dealer for four years in a row. We loved these amps, not to mention the folks running the company.
Tube preamp, solid state power, variable graphic EQ, and Aural Enhancer make this a superb amp, even today.