Chuck,
You don't say if you were loading the pi network with a 50 ohm load. If so, it
may be that the resulting Q of the tank (the working Q) is too low for the GDO
to detect. Although one would expect that if that were the case, the input
networks shouldn't show a dip. On the other hand, it's arguable that the input
networks only show a low Q when loaded with the tube input impedance, which of
course, without the amplifier being driven etc, is high.
So if you had a load connected, try discvonnecting it.
73
Peter G3RZP
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