| Help! Amp on the fritz
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Just got home after the second gig in a row where my amp has acted up; I'm running a Mesa Walkabout into an Aguilar GS212. Last week we played without running direct and the sound coming from the cab was intermittent throughout the set but I thought I had diagnosed it as a bad speaker cable. I swapped speaker cables and headed to tonight's show where I was running direct from the head.
This time the sound coming from the cab was very weak the whole set and the sound guy said he was getting very little signal from my head after the set got started. I switched which output the cable was coming from out of the head, and which input it was going into on the cab but to no avail. Most of the way through the set the soundman unplugged my bass from the head's input, plugged it into a DI box, which in turn fed back into the front of the head; and he took a direct line off of the DI box, instead of my head, to the soundboard. Once this change was made I was getting plenty of sound from my cab once again.
Does anyone have any idea what could be going wrong here? Is it possible that the direct out line from the Walkabout is affecting the amount of signal getting to the cab as well? | 
