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more tubes, a [[6AL5]] and three 12AT7's, comprise a logic circuit | more tubes, a [[6AL5]] and three 12AT7's, comprise a logic circuit | ||
which determines which channel drives the output at any | which determines which channel drives the output at any | ||
given moment. The options are A, B, CHOPPED, | given moment. The options are A, B, CHOPPED, and ALT. | ||
* http://w140.com/tek_fcp/tek_type_c_factory_cal_proc.pdf | * http://w140.com/tek_fcp/tek_type_c_factory_cal_proc.pdf | ||