[Heathkit] How does a parasitic suppressor work?

[rbethman]

A parasitic suppressor, as *most* of us are normally involved with, 
creates a trap, (an L/C circuit piece), or block if you wish, that 
simply stops the "undesired" frequencies from passing through the 
finals, or the linear amplifier.

It can be accomplished by an inductor, (coil), wrapped around a carbon 
resistor in the plate lead.

Other suppression methods are in the construction phase of an 
amplification stage, for example:  Grounding the cathode in an amplifier 
tube such as 572Bs or 813s.  Bypassing 'other' grids such as control 
grid and screen grids with a high voltage disk ceramic capacitor from 
pin to ground with ALMOST *NO* lead length.

Bob - N0DGN
> There is a very complete analysis of parasitic suppressors at the next
> address:
>
> http://www.w8ji.com/vhf_stability.htm
>
> but I do not really grasp how they work.
>
> Any help?
>
> Thanks in advance
>
> HK 6 BCC
>