Hi, I haven't purchased a bass stack amp since 1977. I use a Fender Rumble 100 watts for practice and its a fine little amp for that. Having recently joined a blues jazz band, I need a larger rig. I play a bee bass, 1977 Fender jazz, Zon and Warick fretless. I will be playing in small to larger clubs and a few outdoor jazz type festivals. I enjoy the deep sound of the 70s vibe, tube sound but also need to tone it up a bit for slapping and popping etc. I want a rack mountable head and thinking a 4x10 cabinet and perhaps a second cabinet with a single 15. An amp with a preamp built in perhaps partial tubes? With so many choices I thought I would start here. Thanks in advance..