>
>> >>No. The two anode-circuit resonances have nothing to do with the
>> >>self-resonance of Lsup.
>> >
>> >What two anode-circuit resonances? I'm still not following.
>>
>> I think the two anode circuit resonances that Rich is trying to
>> explain
>> are:
>>
>> 1.) The resonance created by the parasitic supressor inductor
>> 2.) The resonance created by the parasitic supressor resistor
>>
>Resistors don't create resonances
>
I agree, Gerard. In this case, the suppressor resistor is connected in
series with an existing resonant circuit -- i.e., the anode-C, the anode
lead's total L plus the net X of the Tune-C, plus the chassis-L between
the Tune-C gnd and the grid or screen gnd. . For a 3-500Z, typical
values are 5pF and c. 300nH. Typical resonances are 100 - 150 MHz.
>> I think he is saying that since both have different inductance values,
>>
>> there will be two self resonance points in the anode circuit if both
>> have
>> the same Impredance at the parasitic frequency.
>>
>> Make sense?
>>
>No, suppressors are there to prevent resonances, not to create them.
The vhf resonance exists without a suppressor. The suppressor is added
to dampen the resonance and hopefully reduce the tube's amplification at
the frequency of resonance - without substantially affecting performance
at 29MHz.
>
>> Note, I am not saying I necessarily agree with Rich's theory, but I
>> think
>> this is what he is trying to say.
>>
>Some of us wonder if Rich understands himself what he is trying to say
>
>Cheers
>
>Gerard
>M0AIU / AA3ES
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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