[AMPS] parasitics

[km1h@juno.com (km1h@juno.com)]

On Fri, 24 Apr 98 19:38:38 -0800 Rich Measures <measures@vc.net> writes:
>>
>>>
>>>But a good suppressor should work at 50MHz also. 
>
>If it does not melt down at 50MHz, it is going to not be so very 
>suppressive at 100MHz.  


Totally disagree so lets drop that subject since it is going nowhere.

.
>
>>>If the natural parasitic
>>>of a 3-500Z is somewhere around 130MHz 
>
>IMO, there is no natural parasitic resonance.  The tube has 5pF of 
>Cout.  
>Resonance depends on how much L one connects to the 5pF.  Various 
>3-500Z 
>amplifiers have anode resonances of 90MHz to 155MHz, depending on the 
>layout.  


That is the natural resonance I was referring to...sorry if I confused
you.


>
>>>why on earth would you use a
>>>suppressor that can barely perform at 28MHz? 
>
>Because a suppressor that is designed to run hot at 28MHz exhibits a 
>minimal amount of Rp at VHF.  

Hogwash....up to a point.  VHF covers 30-300MHz. You can still build a
suppressor that doesn't do a melt down if the components are sized
larger.

73  Carl  KM1H


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