• 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.

Schematics 813 SE Amp Richards Ellis

Jump to Latest
#41
How do you drive a beam power tube as a pentode? The 813 is a tetrode. It only has two grids, control, and screen.
The other is not a grid, but a beam forming plate, operated at ground potential. sometimes connected to the negative side of the DC powered filament.
 
You must log in or register to reply here.
Top Bottom