It can be done by just changing from a 1.2V battery to 1.5V battery on the Pleiades V6 2DV4 Nuvistor.
An increased supply voltage for heaters and plate creates increased anode current therefore reduced anode resistance ie more bass. This is because of interaction of R with the L of the output transformer primary.
The mic can be used at a greater distance. The MD441 U3 was used in this experiment. See today's posts.
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