Today I had a limited window but decided to try and do a quick shoot out of some preamps. I was using two clone 58's which had the on/off switch. For the life of me I missed one of the switches, the mic was turned where I didnt see if one of the mics was on. I must've spent 20-30 mins trying to solve the problem when I saw the switch was off on one of the mics... D'OH!!!! Never got around to doing a full recording where I was happy with the results because of time restraints. I was debating to glue the switches permanently or just putting painters tape over the switch in its on position so I don't get burnt again. Anyone else make simple but time costly mistakes in the studio?