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.
12BH7 has longer plate length in dimension compare polular 12AT7.
6414 has more plate current flow vs. 12AT7. Does any can help which tube is better to drive EL84 S.E Amp?