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1. [Amps] Effects of load Z mismatch? (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Mon, 09 Jan 2006 16:51:05 +0000; I'm aware that properly matching the tube to the pi network results in best efficiency and, presumably, less distortion. But to what extent? Let's say the correct ZL is 1500 ohms, and your pi net act; /archives//html/Amps/2006-01/msg00275.html (6,616 bytes)
2. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 09 Jan 2006 18:43:01 +0000; There is the "maximum power transfer theorem" which you can google on. For a DC circuit, it is easy to show the load impedance must be the same as the source impedance. See for example http://www.all; /archives//html/Amps/2006-01/msg00291.html (7,697 bytes)
3. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Mon, 09 Jan 2006 14:05:20 -0500; Efficiency has nothing to do with amount of distortion. Distortion is mainly determined by where on the load line the tube is operated and how linear that load line is. Although poor efficiency may; /archives//html/Amps/2006-01/msg00296.html (8,063 bytes)
4. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Mon, 09 Jan 2006 19:55:15 +0000; Frank Carcia gave me the insight I needed. As I'm using tetrodes I have been wrestling with k in ZL = Ep / k * Ip So I got numbers between 1460 and 1820 ohms. Thanks to the insight, I ran the number; /archives//html/Amps/2006-01/msg00299.html (8,027 bytes)
5. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Mon, 09 Jan 2006 20:56:47 +0000; Thanks. If I understand correctly, loading more heavily presents a lower impedance to the anode(s), and also incidentally reduces network Q. As a CW op, my main concern is efficiency and minimizing; /archives//html/Amps/2006-01/msg00301.html (8,044 bytes)
6. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 10 Jan 2006 05:55:47 -0800; ** Q's essentially the same. Jim. Loading heavier keeps the instantaneous anode potential from dipping down into the non-linear region of the tube where anode-current is max. On the characteristic cu; /archives//html/Amps/2006-01/msg00317.html (9,111 bytes)
7. Re: [Amps] Effects of load Z mismatch? (score: 1): Author: "Larry N. Carman" <lncarman@swbell.net>; Date: Tue, 10 Jan 2006 11:08:26 -0600; Heavier Loading: I don't think this comes into play with an oversized tube running 1/3 it's rated plate dissipation ... ??? Example 3cpx5000a7 at 1500 watts output. You'll be inside the linear curve; /archives//html/Amps/2006-01/msg00324.html (10,518 bytes)

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