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## Re: [Amps] A Naive Question...

 To: "amps@contesting.com" Re: [Amps] A Naive Question... Rob Atkinson Fri, 13 Jan 2023 05:31:58 -0600
 It's a good question; not naive. The answer is in the data sheet for the tube. For example, take a look at the data sheet for the 3-400. Let's say we want to drive the grid in class C and modulate the plate v. There are "typical operating" sections for various configurations and conduction angles. In the section for class C plate modulated typical operation it says the peak RF grid v. is 185 v. and grid current is 100 ma. Using Ohms law we know that the necessary driving power is 18 watts. The grid dissipates 20 watts so we're okay. Even if you lose your plate v., the grid current will go a little higher but you'll still be okay. Let's say we want to design a matching network to transform the grid impedance to 50 ohms. To do that we need to know what the grid impedance is. Ohm's law tells us the grid Z is around 1800 ohms for a single tube. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
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