A reference to read about the development and testing of certain
tetrodes specifically for better IMD is the September 1963 issue of
QST, article by Bill Orr, W6SAI-SK.
>Subject: [AMPS] About triodes, tetrodes and IMD
>Some people are very persistently claiming tetrodes being
>superior to triodes in IMD sense. Some tube data sheets
>do support this claim. I do no think that this is
>always true, however. For example 3CX800A7 and
>4CX250B are an example of one triode being
>much more linear than one tetrode.
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