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regular values of gm for a small-sign vacuum tube are 1 to 10 millisiemens. It is one of the three 'constants' of a vacuum tube, the other two remaining its attain μ and plate resistance Rp or Ra. The Van der Bijl equation defines their marriage as follows: g m = μ R p \displaystyle g_ m = \mu \around R_ p working tubes within an audio electrici