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[Amps] A Naive Question...

Subject: [Amps] A Naive Question...
From: John Lyles <>
Date: Tue, 17 Jan 2023 22:20:25 -0700
List-post: <>
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.



On 1/13/23 10:00 AM, wrote:
Message: 1
Date: Thu, 12 Jan 2023 22:59:58 -0600
From: Kim Elmore <>
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 <>
Subject: Re: [Amps] A Naive Question...

Will one or both of these calculators assist you?  Let me know.



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