[Amps] Design VS parasitic

[Carl]

----- Original Message ----- 
From: "Roger" <sub1 at rogerhalstead.com>
To: <dezrat1242 at yahoo.com>
Cc: "Amp Reflector" <amps at contesting.com>
Sent: Monday, August 24, 2009 1:49 AM
Subject: Re: [Amps] Design VS parasitic


>
>
> Bill, W6WRT wrote:
>> ORIGINAL MESSAGE:
>>
>> On Sun, 23 Aug 2009 08:28:50 -0500, "kingwood" <k5jv at kingwoodcable.com> 
>> wrote:
>>
>>
>>>        Now, if we know the frequency of this unloaded parasitic, why 
>>> can't
>>> we build a trap, or load, inside the final compartment to absorb it 
>>> before
>>> it does any damage?
>>>
>>
>> REPLY:
>>
>> You are missing the fundamental purpose of a parasitic suppressor. It 
>> does not
>> "trap", "load" or "absorb" the parasitic. Instead, its job is to  reduce 
>> the
>> gain at the parasitic frequency enough so the tube will not oscillate.
>>
>>
>
> Wouldn't it be correct to say (paraphrasing): Designing a circuit to
> prevent parasitic oscillations rather than designing one to deal with
> the results of one?
>
> 73
>
> Roger (K8RI)

How do you propose to do that when the tube itself is the source?

Carl
KM1H