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1. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Sep 2001 20:07:56 +0100; I'm presently repairing a Heath SB-1000. Are there any modifications that would be worthwhile while the cover is off... besides a step-start and a glitch resistor, that is? 73 from Ian G3SEK Editor,; /archives//html/Amps/2001-09/msg00108.html (7,867 bytes)
2. [AMPS] SB-1000 mods? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 07 Sep 2001 12:31:45 -0700; I replaced the plate choke in mine with an AL80B choke purchased from Ameritron for about $25. The original plate choke had a resonance near 17 meters. I added a corona washer to the bandswitch lug t; /archives//html/Amps/2001-09/msg00109.html (8,395 bytes)
3. [AMPS] SB-1000 mods? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 7 Sep 2001 15:31:32 -0500; Your advice so far has been good. If you do a lot of 160 and 80 meter work, you might want to replace the door knob load padding caps with micas from Ameritron. The Heath door knobs get hot and drift; /archives//html/Amps/2001-09/msg00110.html (10,125 bytes)
4. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Fri, 7 Sep 2001 16:07:47 -0700; // The SB-1000 is virtually identical to the AL-80, and thus so are the needed modifications. 1. glitch diodes across meter movements. 2. lower Rp parasitic suppressors. [photos of parasitic-arced A; /archives//html/Amps/2001-09/msg00111.html (8,969 bytes)
5. [AMPS] SB-1000 mods? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 7 Sep 2001 20:11:16 -0400; work, but thousands are in use. I have always added You'd be far better off to use a HV glitch resistor, and leave the grid grounded. Resistors in grid leads are bad news unless there is good reason; /archives//html/Amps/2001-09/msg00113.html (8,517 bytes)
6. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Fri, 7 Sep 2001 18:43:10 -0700; Hi Tom, Is there any reason that a glitch resistor is preferred over a fuse in the anode lead. I opened up my L-7 power supply last night and found that someone had replaced the 0.82 ohm glitch resis; /archives//html/Amps/2001-09/msg00114.html (10,028 bytes)
7. [AMPS] SB-1000 mods? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 7 Sep 2001 23:04:33 -0400; A .82 ohm resistor is not a glitch resistor or a fuse. Fuses are bad enough because of time delay and internal arcing, and resistors make very poor fuses. Ian's website has good reliable information; /archives//html/Amps/2001-09/msg00116.html (8,674 bytes)
8. [AMPS] SB-1000 mods? (score: 1): Author: watson@sierracmp.com (George K. Watson); Date: Fri, 7 Sep 2001 21:16:35 -0600; There are HV fuses that address these issues. They are readily available surplus, though a bit pricey. The arc quench technology is the essence of KISS as they fill the fuse with sand. George K. Wat; /archives//html/Amps/2001-09/msg00117.html (8,434 bytes)
9. [AMPS] SB-1000 mods? (score: 1): Author: sm3uzs@telia.com (Johan Nordin); Date: Sat, 8 Sep 2001 10:09:51 +0200; How about inserting 5x10 Ohm 1/4Watt in series as a glitch R Would that be a combined glich/fuse??? Good or bad? 73´s Johan SM3UZS -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions; /archives//html/Amps/2001-09/msg00118.html (8,645 bytes)
10. [AMPS] SB-1000 mods? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 8 Sep 2001 08:48:14 -0400; Hi George, Filling the fuse with sand (HV fuse) does not address the long delay time as the fuse opens, nor the unreliability in fusing current. It does allow the fuse to eventually open and quench; /archives//html/Amps/2001-09/msg00122.html (10,675 bytes)
11. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 14:10:28 +0100; Thanks, everybody, for all the suggestions about the SB-1000. I'm still in "repair" mode at present, but will think carefully about them all. Meanwhile... Bad... let me explain. The glitch resistor h; /archives//html/Amps/2001-09/msg00123.html (10,996 bytes)
12. [AMPS] SB-1000 mods? (score: 1): Author: sm3uzs@telia.com (Johan Nordin); Date: Sat, 8 Sep 2001 16:14:01 +0200; Yes but not if I want it to act like a fuse.... Thats the problem, if I have a "heavy duty PSU" and I have *something else* that swiches of the HT there will most likely be a "couple" of "bangs/tics"; /archives//html/Amps/2001-09/msg00126.html (11,837 bytes)
13. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Sat, 8 Sep 2001 09:42:00 -0700; // Tom professed that using a directly-grounded grid increases the grid resonant frequency, and therefore increases VHF stability. I checked this out with a dipmeter. There is virtually no differenc; /archives//html/Amps/2001-09/msg00128.html (9,921 bytes)
14. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sat, 8 Sep 2001 09:38:27 -0700; Ian, is there any preference for the type of resistor used for the glitch resistor? I have some 25 ohm/25 watt Dale RER type metal body resistors, but I am concerned that they might be prone to flash; /archives//html/Amps/2001-09/msg00129.html (12,716 bytes)
15. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Sat, 8 Sep 2001 10:05:37 -0700; // True // During a glitch, the ceramic case tends to explode and throw schrapnel around one's abode. // No cheers - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: htt; /archives//html/Amps/2001-09/msg00131.html (9,112 bytes)
16. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sat, 8 Sep 2001 09:59:02 -0700; Okay, I'll bite, Rich. Which type of resistor should I use and where can I get them? Mike, W4EF......... -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrat; /archives//html/Amps/2001-09/msg00132.html (9,964 bytes)
17. [AMPS] SB-1000 mods? (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sat, 8 Sep 2001 12:35:21 -0500; Wow! Is that ever a true statement. However, this result is from selecting a resistor not robust enough for the job in the first place. Most commercial (MRI, etc.) amps I have seen use a 100 watt po; /archives//html/Amps/2001-09/msg00133.html (9,620 bytes)
18. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Sat, 8 Sep 2001 10:45:25 -0700; // Glass-coated wire-wound fixed resistors seemingly fly ok in glitch service. We buy the glitch resistors for our retrofit kits from Mouser. We sell 'em for $1.50 ea. Commercial peak energy-absorbi; /archives//html/Amps/2001-09/msg00134.html (10,747 bytes)
19. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Sat, 8 Sep 2001 10:55:36 -0700; // A 10-ohm, 10w glass-coated glitch resisitor do not emit schrapnel in a SB-220. This is not the case with a 10-ohm, 10w molded-ceramic type. - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/meas; /archives//html/Amps/2001-09/msg00135.html (8,925 bytes)
20. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 19:41:36 +0100; Yup, they do. The wattage rating only applies when they are bolted to a large piece of metal, and the rated maximum voltage between the resistor and the body is only about 1000V AC. (I have used them; /archives//html/Amps/2001-09/msg00138.html (11,171 bytes)

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