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Thank you, John. Yes, a bias cell is a small electrochemical device that provides negative bias to the grid of a tube. It is not called upon to pass any current, just keep the grid at a slight negative potential, so it can last for its shelf life. If I run across another one I think I'll try droptop's method of restuffing the old one.
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Reece
Perfection is hard to reach with a screwdriver.
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