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RE: TubeCad Error re: LTP?

I agree with you.

If the plate currents are I1 and I2, then I1 + I2 = I0, with I0 being the constant current through the CCS. So with equal plate resistors R, this means I1 R + I2 R = I0 R, and so (V0 - V1) + (V0 - V2) = I0 R where V0 is the V+ voltage, meaning the plate voltages V1 and V2 obey

V1 + V2 = 2 V0 - I0 R = constant

So if V1 increases, V2 must decrease by exactly the same amount, and vice versa.

An unusual mistake by TubeCad! Does he elaborate on why he says what he does? Do you have a link to his article?

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