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1. [Amps] SB-220 and load mismatching... (score: 1): Author: Jeff Carter <amps@hidden-valley.com>; Date: Mon, 2 Mar 2009 17:26:45 -0500; Hi all, It has recently come to my attention that folks are running amps into unmatched loads. Nobody seems to be worried about VSWR very much. I've got a SB-220 that I've never run into anything but; /archives//html/Amps/2009-03/msg00072.html (7,896 bytes)
2. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: "Steve Katz" <stevek@jmr.com>; Date: Mon, 2 Mar 2009 14:33:55 -0800; I don't see how you could hurt the tubes operating into a mismatch. If you hurt anything, it's more likely to be the load capacitor. I used to operate the SB-220 into a 4:1 VSWR or so on 80m quite of; /archives//html/Amps/2009-03/msg00073.html (8,295 bytes)
3. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 2 Mar 2009 19:51:34 -0500; The SB-220 has a decent spaced load cap, either version. Ive run up to 5:1 many times with no arcing using a CW cut 80M dipole on 75 or the same antenna on 17 and 12M. When the bands are wide open th; /archives//html/Amps/2009-03/msg00074.html (10,013 bytes)
4. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 02 Mar 2009 17:04:12 -0800; Carl wrote... Amen to that! Consider an 80M dipole, high in the air, fed with ladder line. The SWR might be VERY high, but It will work very well on most any band! Now consider a dummy load. Its SWR; /archives//html/Amps/2009-03/msg00075.html (8,028 bytes)
5. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: Jeff Carter <amps@hidden-valley.com>; Date: Mon, 2 Mar 2009 20:07:07 -0500; Right, I've got a Cushcraft R7 which fits your requirement of a multiband vertical, but it's extremely narrowbanded. I rebuilt this antenna a couple of years ago, partially for this purpose, but both; /archives//html/Amps/2009-03/msg00076.html (9,474 bytes)
6. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 2 Mar 2009 20:31:12 -0500; Yup Carl Right, I've got a Cushcraft R7 which fits your requirement of a multiband vertical, but it's extremely narrowbanded. I rebuilt this antenna a couple of years ago, partially for this purpose,; /archives//html/Amps/2009-03/msg00077.html (9,903 bytes)
7. Re: [Amps] SB-220 and load mismatching... (score: 1): Author: "KB0NLY" <kb0nly@mchsi.com>; Date: Mon, 2 Mar 2009 19:32:24 -0600; A 4:1 i wouldn't get really excited about with a tube type amp, a solid state amp thats a whole other story. Just make sure you have a good rf ground for the amp! I put in a ground rod throught the b; /archives//html/Amps/2009-03/msg00078.html (11,085 bytes)

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