• 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.

grid-stopper resistor


2008-02-14 6:22 pm
Hi there,
sorry for newbie question...but can someone explain me how to calculate grid-stopper resistor in a class AB1 push pull power amp for guitar?
I mean If I have the data sheet of the tube (pentode) I want to use..
how can I calculate my grid-stopper resistor?
Typical values are 1k, or 5.6k..but which constraint on vacuum tube data sheet must be respected in order to choose this grid-stop resistor? I'm trying to understand the criteria to calculate it and the impact on the sound (I think RC coupling with grid capacitance so a low filter).
Thanks in advance.