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1. [Amps] SB-220 low output on 10 was: SB-220 input problem (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sun, 9 Dec 2018 17:04:04 -0500; I'll be ... I don't understand why, but putting 8-10 feet of RG-8X between the K3 and the amp brought the input SWR down to ~1.5:1. I'd love to know how come. Power output is still quite low (~600W; /archives//html/Amps/2018-12/msg00068.html (9,214 bytes)
2. Re: [Amps] SB-220 low output on 10 was: SB-220 input problem (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Sun, 9 Dec 2018 16:45:28 -0600; The tuned input is a very complicated circuit of varying impedances, so cable length can change the match between the exciter and tubes. Are both tubes glowing? Key down in RTTY mode. Do both tube g; /archives//html/Amps/2018-12/msg00069.html (9,680 bytes)
3. Re: [Amps] SB-220 low output on 10 was: SB-220 input problem (score: 1): Author: "Jim Hargrave" <w5ifp@gvtc.com>; Date: Mon, 10 Dec 2018 08:37:39 -0600; When I was in the Air Force we had Collins KWM-2s. My personal equipment was a Collins KWM-1. It was recommended that we match these radios to amplifier with a 21 ft. coax. My rememberer has forgotte; /archives//html/Amps/2018-12/msg00073.html (10,734 bytes)

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