• 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.

Pentode-like Triodes

It has very high amplification factor (160) so anode current depends heavily on grid voltage and only weakly on anode voltage. Notice too that under normal conditions the grid is positive, so you could say that it is acting more like a screen grid. It is a 'zero bias Class B' triode, so you use it in much the same way as you would with g2 drive to a normal pentode.