normal values of gm for a small-signal vacuum tube are 1 to 10 millisiemens. It is without doubt one of the three 'constants' of the vacuum tube, another two becoming its achieve ? and plate resistance Rp or Ra. The Van der Bijl equation defines their partnership as follows: g m = ? R p \displaystyle g_ m = \mu \in excess of R_ p Most tiny sign va

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