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Old 24th January 2008, 04:30 PM   #11
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Tom,

I respectfully cannot agree with your analysis of the g2 input range being decreased with less neg. g1 bias. You can always turn the tube off with lower g2 signal, so that end is not impacted. With less neg. g1 bias, you get more plate current for the same max. g2 signal voltage. So the upper end is extended, not compressed by less g1 neg. bias.

I do see you point about cathode biasing for stable idle current. But for a required idle current, this can be achieved with less neg. g1 bias and less g2 pos. bias. Plate instability sets in sooner if the g2 voltage is higher however. All theorizing admittedly, but I don't see anything wrong with my analysis.

Don
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