[Amps] grounding grids

[Herzog]

RE:  What makes you think that the impedance between the grid and
common changes by a factor of 10:1 between 3.5 and 29.7 MHz?
73
Gary K4FMX
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That is a red herring.  Because the frequency ratio is about 10 to one 
is the answer.
    This begs the question as to whether the impedance is enough to care 
about, and cap or inductive,  or a series resonance.  Such wonderful 
considerations are why we can discuss this matter after over 50 years.
Wil