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Triple passive attenuator
The 995 Attenuator panel consists of three "passive circuits", each made of a 25k potentiometer between input and output. The signal input to the top attenuator is chained to the bottom two in series. Introduction of a phone plug into middle or bottom input breaks the normalling system: 1 to 1-2-3, 1-2 to 2-3, 1-2-3 to 1-2-3.