• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

balanced grounded grid preamp

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My plan is to use Long tail phase splitter for balanced input. (See the top schematic). The output is then connected to the input of the lower schematic.
 

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