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common values of gm for a little-sign vacuum tube are 1 to 10 millisiemens. It is amongst the three 'constants' of the vacuum tube, one other two staying its obtain μ and plate resistance Rp or Ra. The Van der Bijl equation defines their romance as follows: g m = μ R p \displaystyle g_ m = \mu \around R_ p AC plate resistance of your plate—res