Wednesday, November 18, 2015

Pleiades 2 stage EF183 battery microphone preamplifier with positive biasing resistor from anode to grid and Magnetec core Pleiades bass proximity compensating input transformer, (under construction)




Pleiades 2 stage battery EF183 electron tube microphone preamplifier under construction


2 li-ion 3.7V batteries will be used in series for series heaters (each tube heater deliberately at 3.7V, see older posts) and anode supply 7.4V.


Schematic and completed prototype of 1 stage EF183 battery pre preamplifier is given on following posts.


Pleiades public domain dedication


1 comment:

  1. They allow you to double the battery capacity but what I like best about it is that it gives you a bigger surface to grip as the A6000 by itself is a relatively small camera. Check out our video, be sure to like, comment and subscribesmoke alarm batteries

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