• 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.

Magic eye with tube em80-schematic or circuit

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Check your grid circuit. These tubes run in Grid Leak Bias mode. If the grid to ground resistor is not large enough it may not work properly. You should have about -10V and possibly as much as -14V on the grid.

A very high input impedance volt meter is necessary to measure the grid voltage.
 
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