Characteristics of Triodes in Parallel

[ashart]

I have the characteristic curves of a 12AU7, and can graphically plot the operating point for a cathode-biased tube with a given Vbb and Rk.

My question is this:  If I were to connect TWO sections of a triode in parallel, what do the new characteristic curves look like?  Or, how will I calculate the operating point of the two-tube connection with a given Vbb and a given cathode resistance?

Advice appreciated.

73.

al hart, w8vr

[W7TFO]

Grid voltage requirements will stay the same,
grid current (if any, depends of class of operation) will double,
plate impedance will be halved.

73DG