I'm trying to figure out if I missed something or if there was something wrong with the head. Just trying to learn here, so please play nice. I was working as a stage hand at a out door jazz gig (5 bands) and was helping set up the back line. The bass rig was a SWR-900 (brand new) and two Goligth cabs, 4x10s. The bass player asked for some help and I was volunteered as "the bass guy" to help. The bass was a '62 reissue and was plugged into a DI that was running to FOH and to the passive input on the SWR. He wasn't getting any sound from the rig. I checked the back and the cabs were plugged into the X-over outs. I powered off the amp and plugged one each into the parallel stereo outs. We had sound for about a minute, then it cut out and wouldn't come back no matter what I changed. Powering off each time I made sure the stereo/mono switch was set for stereo, tried the X-over outs again. Nothing worked and we wound up using a different head entirely. I couldn't check the fuses (no multi-meters around) and there weren't any Speakerton cables of that size around. The Goligths were set for 0db and worked fine with the replacement head. Knob tweaking on the front panel made no difference. I can't think of any thing else I could have tried. Any ideas what I may have missed?