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Originally Posted by Chris K
Thanks as always Kevin. Do you mind expanding on this a bit for me? I thought bias voltage just turned a tube on and off. There's a ramped relationship between bias on the grid and the plate output? Is a biasing voltage always a negative voltage? Since -4.8V is a higher voltage than -33 volts DC does that account for the higher current on the plate? Confused as usual by the details. Can you explain to me how a 6BG6 works other than the filament voltage?
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You've pretty much got it. The negative bias on the grid(relative to cathode)sets the idle current, or operational point. So in some cases it can be turning on and off, like a switch, and other times it's partially on in neutral, so to speak. As far as I know normal receiving tubes use negative bias on the grid. If that's not clear I'll attempt to elaborate.