SUBSCRIPTS FOR MULTI-UNIT TUBES: b = Beam Power Unit. d = Diode Unit. hp = Heptode Unit. hx = Hexode Unit. p = Pentode Unit. t = Triode Unit. tr = Tetrode Unit. 1, 2, 3, etc. = No. 1, No. 2, No. 3, etc. This will work with amplifiers that have two or four output tubes and will reduce the power by approximately 40 percent or more. When the switch is in full power, or pentode, mode, the amp is completely stock. When it is in half-power, or triode, mode, the output tubes are wired to run in a configuration that results in a reduction of power.
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SHARP-CUTOFF PENTODE PIN DIAGRAM: 6F WIRING SIDE OF SOCKET IS SHOWN AMPLIFIER MAKE: MODEL: SERIAL NO:. Here is the complete set of schematics for my "Barbarik" balanced pentode push-pull amplifier EDIT: There is a better option about three posts down with a simplified VR tube based output stage screen regulator. IME this gives better final sound quality than the hybrid shunt EL84/opamp based reg in this collection of sheets. Audio circuit: Main Power supply: Bias supply for both channels.
