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  #10  
Old 08-10-2011, 06:30 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
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So what happens if you inject at pin 2, the grid of the 1st video stage (with the diode disconnected)?
Have you actually checked the diode with an ohmeter? It's a very elderly germanium diode, and should show a very high (though probably not infinite) resistance in one direction and a much lower resistance in the other direction.
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