I stopped playing in 1988 for 27 years.  I started again but refreshed all my gear.  Today after clearing out the loft hatches I rediscovered this.  I mostly play 8 and 6 strings now and have a small bass combo.  Not surprisingly (and disappointingly, the rig doesn't sound so good.  I'm not sure if it's the cab (a Peavey 15" black widow) or the amp.  I've nothing else to try then through.  I've taken a shot of the front, rear and a clip of the sound.  I thought it may be the valves but before I