Case No. 2) Airtight ATM-300B  A customer damaged his Airtight amplifier when he plugged in the 300B tubes incorrectly. We diagnosed the problem and repaired the unit.  (Click to see enlarged photo) The amplifier was bench tested to meet factory specification. Estimated Repair Cost: $ 250.00 Actual Repair Cost: $ 250.00 Turnaround time: 2 days. | 
