You misunderstand, if you read the rest of my story you would see I
do not believe in the parasitic theory.
As long as I have your attention. Eimac suggests using a glitch
resistor in the b+ line, in your opinion do you think I should
install one. I don't think the AL80A that I have (SN 0156) has one,
but I may be wrong, just did not see one there. Should I put one in
or leave it alone?
Thanks
Dale K9VUJ
> > I don't normally run this amp that hard, some do. I don't think this
>> amp has any parasitics, but I have not tried this amp yet on the
>> higher bands, 15,20.
>
>
>What you all seem to miss is it is physically impossible for a parasitic to
>cause a G-K short in a tube by bending the filament, so why would an
>oscillation (even if it occurred) be an issue???
>
>The peak AC operating current puts more bending force on the filament than
>any emission related force ever would. The filament's normal peak current
>operating is 21 amperes. The peak saturated emission current avail;able in
>any oscillation would be much less than half that value!
>
>To put this into perspective, look at the hairsprings and power of a magnet
>in a panel meter. Look at the small amount of torque produced.
>
>If we look at the size of the anode choke wiring in the amplifier, where ALL
>plate current must pass, and see nothing moves that alone should clear up
>this rumor that was started and kept up by one person from California. If
>dozens of turns of very fine wire in the choke doesn't collapse, why would a
>much stronger and thicker small diameter helice bend and displace?
>
>The ONLY reason chokes have enough energy to displace wire is through a HV
>flashover or arc in a tube, never from emission limited currents like an
>oscillation would produce.
>
>The parasitic paranoia is very odd. I'm having a tough time understanding
>why so many otherwise reasonable people swallow it! I understand why a guy
>selling kits would blame every failure on a parasitic, it is good for
>business. But I really don't understand why so many people don't reason
>through the problem.
>
>Or is it desperation?
>
>73 Tom
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