Originally posted by SoulFetish
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If you're correct about the "feedback effect" by tying the grid to the top of the tail resistor, maybe it might be useful in this circuit. If I tie the grid of the second triode to the top of the tail, could we not take advantage of the presumed effects of feedback? If it does increase the cathode input impedance, would it also not decrease the output impedance at the plate?
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If it does increase the cathode input impedance, would it also not decrease the output impedance at the plate?
Anyway the upper limit for plate output impedance is given by the plate resistor.
But before further speculating on shaky ground if would prefer that you build at least the single tube circuit and measure input and output impedances with different grid connections. This will show if I am correct so far.
Unfortunately I am not yet good enough to derive the complete set of circuit formulae in a reasonable time (I am learning from Kuehnel and others). So I don't feel really safe to predict the effects of such modifications.
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