on 3/10/00 7:37 PM, measures at 2@vc.net wrote:
>> And please show us some SCIENTIFIC
>> proof that this "codswallop" as you call it really is "codswallop." Unless
>> you can back up your claim scientifically, don't make it.
>>
> Do you believe that tubes gas up and fail when they are in the mfg.'s
> sealed box.?
Why not. If the gases are trapped in the surface of the metal why would
some not escape? Also, since it is IMPOSSIBLE to create a perfect vacuum
there is certainly some gas still left inside the tube.
I see no problem.
>
>> And of course the resonance might vary from capacitor
>> to capacitor. But one question is was it a series resonance or a parallel
>> resonance?
>>
> Better ask Tom. {chortle].
Why don't YOU tell me. After all, you have all the AMPS archives. Of
course, perhaps I should ask Tom for the full quote in context. I don't
want the "edited" version that could be provided from someone other than
Tom.
>
>> And if it was series resonance so what? The odds of it being at EXACTLY the
>> same resonant frequency as that of a tube's anode circuitry are pretty slim
>> particularly in a good amplifier design.
>>
> To produce high voltages, the resonance can not be on the parasitic freq.
Well, gee, Rich. Let's see...If a tube is going to oscillate, it will
oscillate at or near the resonant frequency of the anode. If the tune cap
has no resonance it will look like pretty much a very low impedance to
ground to VHF energy. Therefore, VHF energy will never reach the
bandswitch. We've pointed this out to you before, but you always bring up
the resonance in the cap.
So, at resonance, the cap would look like something other than a low
impedance to any energy at the frequency of resonance. However, at any
other frequency, it still looks like it's low impedance.
Therefore, in order for the VHF energy to make it to the bandswitch, the cap
has to be resonant at the anode resonant frequency. And I believe that
would be a parallel resonance no a series resonance (I forget).
So if the resonant frequency of the cap is different than the resonant
frequency of the anode, how does the VHF energy make it to the bandswitch?
Or am I missing something?
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
Member: ARRL, AMSAT, DXCC, NRA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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