Eddy, that's a good question and you are right many amps have totally
different values for their inductance of plate chokes. I am pretty sure I saw
this
issue dealt with in the handbook or Orr book, but I don't recall. Typically
more inductance is not necessarily better, but there must be a minimum for
the lowest frequency the amp will be used on. As you indicate the important
thing is a resonance in the ham bands. For example the Sb-220 plate choke is
about 90UH and is good for 80 meters you'll need a bit more for 160 though.
The same choke is good all the way to 6 meters excluding resonant
frequencies. There is no magical perfect # but rather a minimum workable
value based on
the lower frequency the amp will be used on. Most of the time if your value
of choke is insufficient you will see signs of RF back into the power
supply. Lou
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