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1. [AMPS] SB220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:28:22 +0100; filament Is there a particular reason that this failure mode can exist E.g no fuse for (false) economic reasons, or did it just happen that way - as things sometimes do in designs? 73 Peter G3RZP --; /archives//html/Amps/2000-10/msg00014.html (6,839 bytes)
2. [AMPS] SB220 (score: 1): Author: 2@vc.net (measures); Date: Mon, 2 Oct 2000 04:59:20 -0700; filament No one figured what would happen if a tube shorted? To be sure, it's a major oversight. cheers, Peter - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesti; /archives//html/Amps/2000-10/msg00027.html (6,933 bytes)
3. [AMPS] SB220 (score: 1): Author: bydal@mis.net (Bydal); Date: Fri, 29 Sep 2000 11:34:23 +0100; I have the good 'ol SB220 along with it's VHF parasitic problem. I know Haurbach sells kits for this but is closed to due to his illness the website tells me. Can someone please tell me how to fix th; /archives//html/Amps/2000-09/msg01170.html (6,783 bytes)
4. [AMPS] SB220 (score: 1): Author: w2ge@home.com (Phil Levin W2GE); Date: Fri, 29 Sep 2000 07:40:09 -0400; Oh Boy! Here we go............. I have the good 'ol SB220 along with it's VHF parasitic problem. I know Haurbach sells kits for this but is closed to due to his illness the website tells me. Can some; /archives//html/Amps/2000-09/msg01171.html (7,429 bytes)
5. [AMPS] SB220 (score: 1): Author: 2@vc.net (measures); Date: Fri, 29 Sep 2000 11:43:35 -0700; Bryan - Specifically, what problems did you have? We still sell low VHF Q parasitic suppressor retrofit kits. Info is on my Web site. If our kit doesn't stop the parasitic problem, it is free. Howev; /archives//html/Amps/2000-09/msg01181.html (7,542 bytes)
6. [AMPS] SB220 (score: 1): Author: TOMK5RC@aol.com (TOMK5RC@aol.com); Date: Mon, 21 Sep 1998 11:31:10 EDT; On the same day the parasitc choke fried in my AL1200, my trusty and reliable SB220 went up in a blaze of smoke. I am inclined to yank everything out of the power supply except the transformer and re; /archives//html/Amps/1998-09/msg00220.html (6,952 bytes)
7. [AMPS] SB220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 21 Sep 98 09:12:10 -0800; Mouser 1 800 346 6873 or DigiKey 1 800 344 4539. Recifiers.: Four 1N5408s (4000piv per leg) will replace the orig. 6 x 600v = 3600piv per leg setup. The orig. filter caps can be replaced with newer; /archives//html/Amps/1998-09/msg00222.html (7,318 bytes)
8. [AMPS] SB220 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 18 Jun 1997 16:01:00 +0100; Harbach Electronics web page is at www.harbach.com/ 73 de G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1997-06/msg00260.html (6,600 bytes)
9. [AMPS] SB220 (score: 1): Author: realex@flash.net (Bob Alexander); Date: Thu, 19 Jun 1997 21:02:15 -0500; Howdy, I currently own two SB220s, one of which I bought in 1982. When I purchased it, it had a standy switch, step start in the power supply, filament step start, and an open .82 ohm resistor. My re; /archives//html/Amps/1997-06/msg00295.html (7,903 bytes)
10. [AMPS] SB220 (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 20 Jun 97 05:14:16 -0700; IMO, a kaput R1 [0.82 ohms] can be caused by: 1. Broken spot welds between the 3-500z anode cooler and the anode stem. The cooler breaks loose on one side, tips sideways, and shorts against the grou; /archives//html/Amps/1997-06/msg00301.html (9,382 bytes)
11. [AMPS] SB220 (score: 1): Author: w5robert@blkbox.COM (Robert); Date: Wed, 19 Mar 1997 00:59:28 -0600 (CST); any ideas on what damaged a SB220 during a move by the moving company?? After moving to Houston (some time ago) the tubes in the SB220 "took off". Bought a new set and believe the same happened to th; /archives//html/Amps/1997-03/msg00180.html (6,972 bytes)
12. [AMPS] SB220 (score: 1): Author: rfp@rfparts.com (rfp@rfparts.com); Date: Wed, 19 Mar 1997 11:54:24 -0800; Hi Robert, My guess is you had shorted tubes the first time. Sometimes this blows the chokes & resistor from grid to ground on each tube. No plate current would be drawn. An open zener bias diode mig; /archives//html/Amps/1997-03/msg00181.html (6,781 bytes)
13. [AMPS] SB220 (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Wed, 19 Mar 1997 14:52:07 -0800 (PST); I had a similar problem in an Alpha 78 -- it was a popped 1mH RF Choke -- check them -- if they are open, replace -- should be a radio shack part. Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritc; /archives//html/Amps/1997-03/msg00185.html (7,777 bytes)
14. [Amps] SB220 (score: 1): Author: ZL2AAA <zl2aaa@paradise.net.nz>; Date: Tue, 04 Nov 2003 08:52:27 +1300; Hi All A local amateur has the opportunity to purchase a SB220 with new 3/500's what are the pro's and con's for this amp and what is a reasonable price .Tnx Morrie __________________________________; /archives//html/Amps/2003-11/msg00026.html (6,518 bytes)
15. Re: [Amps] SB220 (score: 1): Author: ka1xo@juno.com; Date: Tue, 4 Nov 2003 09:46:32 GMT; Dear Morris, The SB-220 should be modified so that it limits the inrush current to the filaments. I used a switch and resistor in the filamanet XFMR primary that put the resistor in series and then b; /archives//html/Amps/2003-11/msg00038.html (7,381 bytes)
16. Re: [Amps] SB220 (score: 1): Author: "Mike Hyder --N4NT--" <N4NT_Mike.Hyder@CHARTER.NET>; Date: Tue, 4 Nov 2003 10:55:53 -0500; Greetings, Morrie-- I built an SB-220 in 1977 and have used it regularly until lightning damaged it three months ago. It is on my workbench now and will be repaired as soon as the spirit moves me. Ri; /archives//html/Amps/2003-11/msg00042.html (11,862 bytes)
17. Re: [Amps] SB220 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 04 Nov 2003 09:34:33 -0500; At 09:46 AM 11/4/03 +0000, ka1xo@juno.com wrote: However, there's a website and there's a Mr. Measures around this forum who has studied much of the mods on '220's and may offer good ideas. However,; /archives//html/Amps/2003-11/msg00043.html (8,294 bytes)
18. Re: [Amps] SB220 (score: 1): Author: rlm < <r@somis.org>>; Date: Tue, 4 Nov 2003 09:00:13 -0800; On Tuesday, November 4, 2003, at 01:46 AM, ka1xo@juno.com wrote: Dear Morris, The SB-220 should be modified so that it limits the inrush current to the filaments. ** The SB-220 has a current-limiting; /archives//html/Amps/2003-11/msg00045.html (7,726 bytes)
19. Re: [Amps] SB220 (score: 1): Author: Steven Grant W4IIV <stevengrant98@yahoo.com>; Date: Tue, 4 Nov 2003 18:37:02 -0800 (PST); price?..about $550 a good fine tuning may be in order but the amp does very well, best value in my opinion.....go for it steven, W4IIV ZL2AAA <zl2aaa@paradise.net.nz> wrote:Hi All A local amateur has; /archives//html/Amps/2003-11/msg00046.html (7,988 bytes)
20. Re: [Amps] SB220 (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 04 Nov 2003 08:21:10 -0800; ZL2AAA wrote: Hi All A local amateur has the opportunity to purchase a SB220 with new 3/500's what are the pro's and con's for this amp and what is a reasonable price .Tnx Morrie Can't tell you a rea; /archives//html/Amps/2003-11/msg00048.html (7,889 bytes)

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