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RE: question on ohm's law

We know from the tube manual that one operating point for the 26 is Ep = 135V; Ip = 5.5mA with a grid voltage of -10V. So we simply draw a load line that fits the curves which happens to be 20k ohms. We have 400V as our PS voltage so we know that we need to drop that to 240V for our plate supply. 400V - 240V = 160V so we know that we need to drop 160V for our plate supply so 160V / .0055 = 29090 ohms. The standard resistor value is 30k ohms: close enough for audio. We need a PS cap at the 240V voltage node.






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