Current dip at resonance

[AB2EZ]

Tom

Remove the crystal, and very briefly close the key.

How much cathode current do you measure?

Stu

[k7mdo]

I am wondering if I could use my "antenna analyzer" to look "into" the tuned pi network with the dummy in place?  I can access the pi network with everything up to it disconnected prior.  Set it at the crystal frequency and see what the impedance is looking that direction... what the tube is seeing...  thoughts on that?

Yes, I expected to see a different L possible with the change in plate current... however, the change was pretty small, only a few milliamps... hard to tell if small L changes actually show any significant differences.

Well, I am going to have to get new batteries for the analyzer to do that test and it is too late tonight.

73, Tom