transconductance
[ trans-kuh n-duhk-tuh ns ]
/ ˌtræns kənˈdʌk təns /
noun Electronics.
the ratio of a small change in anode current of an electron tube at a certain level of output to the corresponding small change of control-electrode voltage, usually expressed in mhos or micromhos.
(loosely) the amplification factor of a tube divided by its anode resistance.