[Amps] Plate Choke Values

[Gudguyham at aol.com]

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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