----- Original Message -----
From: "Roger" <sub1@rogerhalstead.com>
To: "Carl" <km1h@jeremy.mv.com>
Cc: <dezrat1242@yahoo.com>; "Amp Reflector" <amps@contesting.com>
Sent: Monday, August 24, 2009 6:13 PM
Subject: Re: [Amps] Design VS parasitic
>
>
> Carl wrote:
>>
>> ----- Original Message ----- From: "Roger" <sub1@rogerhalstead.com>
>> To: <dezrat1242@yahoo.com>
>> Cc: "Amp Reflector" <amps@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@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?
> Reduce the tube gain in the parasitic range to prevent the oscillation? At
> least that's what I've been reading on here. <:-))
And then we come full circle to the raised grids and gain reduction in the
SB-220. Ive realized after all these years that the parasitics or grid issue
will never die so why bother getting riled up.
Ive better things to do.
Carl
KM1H
>
> 73
>
> Roger (K8RI)
>>
>> Carl
>> KM1H
>>
>>
>>
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