Quote:
Originally Posted by old_coot88
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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The diode reads 35k in one direction and 1.5k in the other.
There is no change in raster when I inject at pin 2 of the 12au7.