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normal values of gm for a small-signal vacuum tube are 1 to 10 millisiemens. It is amongst the three 'constants' of the vacuum tube, the other two becoming 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 \over R_ p working tubes in an audio electrica