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Point J--Plate of I.F. Tube

Back    Signal should be heard with increased strength.

   Gain, 20 to 100 times. This depends upon receiver design and upon the a.v.c. voltage.

   At this point, only the i.f. signal should be found. The tuned i.f. transformer has rejected all other frequencies and the tube is simply amplifying the input presented at the grid.

Trouble
   If the signal appears at the grid and not at the plate, the tube is not working. Possible causes are:
  1. Defective tube.
  2. Wrong voltages or no plate voltage.
  3. Mistuned or defective i.f. transformer on the plate side.
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