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By the way, if you don't like replacing the 5.6k ohm resistor, you could add an emitter follower to your amplifier to drive the lower impedance - but you would also have to increase the coupling cap from 0.1 uf to 1 uf, a nuisance because you are getting back into the range of polarized caps.
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Old TV literature, New York World's Fair, and other miscellany
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