Amps
[Top] [All Lists]

## [Amps] A Naive Question...

 To: amps@contesting.com [Amps] A Naive Question... John Lyles jtml@losalamos.com Tue, 17 Jan 2023 22:20:25 -0700
 I always use the Fourier series calculation based on using a selected load line on the constant current characteristic curves. Using a series of 8 - 10 points (i forget) along this load line, plug them into the equations and it gives the approximate DC parameters. This also gives grid dissipation. The formulas are programmed into an ancient program I wrote, but there are others equally valid in doing this. Its the method described by Eimac in electron tube calculator #5. Its also in their Care and Feeding of Power Grid Tubes book online. ``` John K5PRO On 1/13/23 10:00 AM, amps-request@contesting.com wrote: ``````Message: 1 Date: Thu, 12 Jan 2023 22:59:58 -0600 From: Kim Elmore To: amps@contesting.com Subject: [Amps] A Naive Question... When I look at transmit tube ratings, I see that they're always specified in watts, which makes perfect sense because the grid structure can dissipate only so much heat before all manner of Bad Things will happen. Every amp I've seen measures grid current, and the spec sheets specify currents for "typical" operating conditions for the various tubes. But... How do I convert grid current to grid dissipation? Do I need some kind of grid impedance to do that? Kim N5OP ------------------------------ Message: 2 Date: Fri, 13 Jan 2023 00:09:48 -0500 From: "Lou Everett, Sr." To: Kim Elmore Cc: amps@contesting.com Subject: Re: [Amps] A Naive Question... Will one or both of these calculators assist you? Let me know. *https://robrobinette.com/Tube_Bias_Calculator.htm * *https://eepower.com/tools/power-dissipation-calculator/# * Lou WA5LOU ``````_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
 Current Thread [Amps] A Naive Question..., Kim Elmore Re: [Amps] A Naive Question..., Lou Everett, Sr. Re: [Amps] A Naive Question..., Rob Atkinson [Amps] A Naive Question..., John Lyles <=