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RE: Broskie is correct on this one.

OK. If you used a resistor instead of a constant-current source, the two outputs will not be perfectly balanced if both triodes have the same value anode resistors (although balance will be pretty good). The difference in gain between the two outputs is given by:
A1/A2 = 1 + [(Ra+ra)/(Rk(mu+1))]
(Rk is the total cathode resistance in the case of a biasing scheme for the circuit)

So this all comes down to how effective the CCS is. You can look at the CCS as being very similar to a resistor tied to a very high negative voltage, but no CCS is perfect in practice, so a variance will exist. The lower the mu of the tube, the harder it will be to get rid of the offset.

I might be hung up on nomenclature- since 'perfect' doesn't exist I simply can't accept that the CCS is perfect (especially since most of them I see are really terrible).


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