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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:
- Defective tube.
- Wrong voltages or no plate voltage.
- Mistuned or defective i.f. transformer on the plate side.
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