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Technical details of Grimes 7


Inverse Duplex

 


Underside view of Grimes 7

 


Note the neutralization on V1 & V2.
Pot R3 is a top-of-chassis control that feeds the diode detector filament only.
Grimes appears to be attempting to use a vacuum tube to accomplish what Acme did with a crystal detector (below).

 


Not sure what an animal poke has to do with radio,
but that's what you get if you look up U.S. patent 241602

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Museum of Broadcasting