>
>I have a single 3-500Z amplifier. When I run it at 2.4kV EHT at the rated
>400mA of anode current, I get 450W out with 130mA grid current and 60W drive.
This
>is on 50MHZ. The problem with this is the low efficiency and subsequent 570W
>anode dissipation.
>
>I can make the amplifier more efficient my letting the grid current
>increase - I have
>a low EHT after all, but at 175mA Grid current and 350mA anode current I
>get the same
>power out - 50% efficient and within ratings at 450W anode dissipation.
>
>How can I calculate the grid dissipation ? Is 175mA Ig really too much?
A close enough method: Measure peak cathode potential with an
oscilloscope and probe. (typ value is 115v) Calculate the RMS value by
multiplying by 0.707. Multiply by the indicated grid current. .//
175mA is well within the 20w rating.
>
>.....
- cheers, Mike
>
>
>--
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>
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
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Search: http://www.contesting.com/km9p/search.htm
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