On Aug 7, 2005, at 7:32 PM, Michael Tope wrote:
>
> ----- Original Message ----- From: "R.Measures" <r@somis.org>
>
>> Not quite, Joe, just lots of rotten splatter.
>> Few of us appreciate the current carrying ability of the 8877 grid.
>> For example, at it's rated f-max of 250MHz, with a 4kV PS, the 8877's
>> grid must be able to carry over 40 Amperes of current from the 10pF of
>> C to the anode.
>> (2670V-rms across 10pF @ 250MHz = 2670v / 65-ohms = 41.07A-rms)
>>>
>
> Rich,
>
> You are making an apples to oranges comparison. The issue isn't the
> current carrying capability of the 8877 grid, it is the power
> dissipation
> of the grid.
The grid has ESR. Current through R causes dissipation.
> A capacitor has a power factor of ~0.0.
Au has c. 60% of the conductance of Cu or Ag. Just because the grid
has C does that mean there is no P dissipation in the grid?
> ...
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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