I have a Drake T4 that needs neutralization . I have tried the approach given in the manual and while it seems to work I thought I might use this as an opportunity to learn how to do what is called a Cold Tube neutralization where you do not apply High Voltage to the plate. Seems that you can Neutralize the tube with only filament voltage, bias and screen voltages applied. Has anyone done this and if so what is the preferred method of doing it.

Steve NU0P

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