On Sat, 13 Aug 2005 20:45:08 -0400, Ken Scharf
wrote:

[snip]
One advantage of "cathode driven tetrode" (where normal grid bias and
screen voltage are applied) is that you get higher power gain and
usually don't need to neutralize the amplifier (technically it is
IMPOSSIBLE to neutralize a ground grid amplifier anyway).

You should take this up with the guys at Eimac. (Well the used to be
Eimac anyway).

Section 5.4 of "Care and Feeding of Power Grid Tubes" is titled,
"Neutralizing Ground-Grid Amplifiers."