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1. [Amps] 50ohm:200ohm toroidal transformer (score: 1): Author: gdaught6@stanford.edu; Date: Tue, 22 Mar 2005 09:07:33 -0800; Hi all, I'm trying to build a 50:200 ohm broadband transformer for the input of a tetrode amplifier. Sevick's book and Measures' website give instructions for such a 2.4 inch unun. Sevick says it can; /archives//html/Amps/2005-03/msg00487.html (7,418 bytes)
2. Re: [Amps] 50ohm:200ohm toroidal transformer (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 22 Mar 2005 09:44:27 -0800; George -- I used a 2.4 inch core because it was large enough to wind myself without having to hire a lepruchuan. The amount of extra money spent for the 2.4" core is minimal. A caveat -- If the ampli; /archives//html/Amps/2005-03/msg00489.html (8,630 bytes)
3. Re: [Amps] 50ohm:200ohm toroidal transformer (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 23 Mar 2005 03:20:44 -0800; The bifilar xfmr at: http://www.somis.org/D_a_05.GIF would work for 160m and 80m. If you use Mu=125 material, it would need fewer turns. 4, 4-250As in AB1 in parallel sounds formidable if one uses c.; /archives//html/Amps/2005-03/msg00516.html (10,967 bytes)
4. Re: [Amps] 50ohm:200ohm toroidal transformer (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Wed, 23 Mar 2005 19:26:42 GMT; Hi George, I would recommend a transmission line transformer from the equal delay family which exhibits the best wideband response. A pair of coax cables with 100 (93 close enough for ham work) ohm i; /archives//html/Amps/2005-03/msg00536.html (9,377 bytes)

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