[Amps] grid resonance

[Peter Chadwick]

Ian said:
>There are too many unknowns 
in that loop to understand what the frequency of the observed dip might 
be telling us about reverse feed-through from the anode back to the 
cathode.<
Which is where a network analyser (another machine that can lie like a personnel manager!) comes in. Actually, you don't have to have a vector network analyser - a scalar one (posh name for what we always use to call a sweeper) will do. Or a spectrum analyser and tracking generator.
At a pinch, a signal generator and a sensitive voltmeter of some sort.
73
Peter G3RZP