>
>
>
> .07 pf at 205 Khz. = 11 meg
> 50 uh at 205 Khz. = 64 ohms
> .002 ufd 205 Khz. = 388 ohms
>
> What is this, a math test?
no, but you got the answers right.
>I was just curious
>of the frequency.
In order to bring about the alleged VLF parasitic oscillation, the
feedback path must deliver a significant signal to the cathode. This
seems unlikely if the feedback path has 11meg-ohms of Xc. // I have
operated my SB-220 with directly grounded grids and with grids that were
grounded through capacitors. There was little difference at 40m or 80m.
. There was no indication that a VLF oscillation was taking place. //
Another problem with the VLF osc. theory is that the anode to gnd path
for 205KHz is quite low, 388-ohms minus 64-ohms.
>
later, Mark
>
>> > If my calculation is correct, it would be about
>> >205 Khz, assuming the choke is 1 mh.
>> >
>> Agreed / What is the reactance of the 3-500Z's 0.07pF anode/cathode
>>
>> feedback capacitance at 205KHz, Mark? At 205KHz, what is the Z of
>> the
>> 50uH HV-RFC and 2000pf HV bypass.?
>> >
end
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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