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normal values of gm for a little-signal vacuum tube are 1 to 10 millisiemens. It is probably the a few 'constants' of a vacuum tube, another two remaining its attain μ and plate resistance Rp or Ra. The Van der Bijl equation defines their partnership as follows: g m = μ R p \displaystyle g_ m = \mu \above R_ p As a result of experiments done on