>
>> http://cticomtec.com/CTI/pla800.html
>>
>> "Triodes are Good, Tetrodes are Better....
>>
>> Unlike triode amplifiers, the PLA800 uses tetrode tubes, which have a
>> control screen grid. The screen grid not only adds to the amplification
>> factor of the tube, but also controls the electron flow to the plate. When
>> current regulation is used for the screen grid, as with the PLA800, plate
>> and screen currents are limited to their maximum value. As a result you
>> will not overdrive the PLA800 creating sideband distortion or splatter.
>> Increasing the drive power beyond 50 watts, does not increase the power
>> output. Because of this self-limiting feature, an ALC circuit is not
>> needed. The amplified audio, as in SSB service, is clear and clean, void
>> of sibilance and distortion."
>
>That's pure 100% nonsense.
>
// Maybe 80%. Screen curent has to be able to follow the signal level
during the sine wave, so the voltage can't vary during the normal signal.
>Current limiting actually INCREASES IMD when you hit the limit.
// True.
>The only plus is it save the tube from damage!
>
>Voltage regulation is what reduces splatter, not current regulation.
>
>
>
>73, Tom W8JI
>W8JI@contesting.com
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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