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.
Surely 220uF capacitor is more effective in reduction of the ripple from the power source. Adding the film capacitor will lower the power supply source impedance at high frequency which yields smooth treble.
