• 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.

EM84 based VUmeter "lines" don't go to zero

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Thanks for everyones response!!


If I short the 1.2M resistor, then the signal doesn't get to the tube, so that's not a solution.

I tried to insert a trimm.pot between the cathode and the GND. But when I started to increase the trim.pot's resistance, then lines started to grow longer.

When I turn off the amplifier, the lines are getting longer, when the B+ is decreasing.

Maybe the B+ isn't high enough in my amplifier? Under steady state, when all the tubes are warmed up, the B+ is 320V.
 
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