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1. [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Sun, 25 Jun 2017 23:54:00 -0600; All, Ive been restoring a SB220 and finally got to the testing stage this weekend. When I turned it on, the HV went up to ~1kV and then started to drop. Successive cycles of the power switch did noth; /archives//html/Amps/2017-06/msg00272.html (6,817 bytes)
2. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Victor Rosenthal <k2vco.vic@gmail.com>; Date: Mon, 26 Jun 2017 12:31:15 +0300; I would certainly check the filter caps and diodes. You can try the amp without tubes to establish that the problem is in the power supply. The filament to grid shorts I've seen in 3-500Zs have only; /archives//html/Amps/2017-06/msg00273.html (7,920 bytes)
3. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Mon, 26 Jun 2017 12:28:59 +0000 (UTC); Any time the fan doesn't start immediately after power-up, shut down your SB-220 **immediately**. You may have a short, and if the breakers/fuses don't blow, you will smoke the power supply very quic; /archives//html/Amps/2017-06/msg00274.html (8,088 bytes)
4. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Zev Darack <zevdarack@gmail.com>; Date: Mon, 26 Jun 2017 10:02:59 -0400; The filter capacitor assembly can slide out during reassembly and short to the chasis which would cause the stepstart to blow.....just something to check in your troubleshooting. Zev N2WKS __________; /archives//html/Amps/2017-06/msg00275.html (9,150 bytes)
5. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Tue, 4 Jul 2017 15:30:58 -0600; Thank you for the replies. I had some time to circle back to this today and checked a few things. - With the tubes removed, it looks like they have no shorts but the grids measure ~0 ohms (maybe its; /archives//html/Amps/2017-07/msg00000.html (8,893 bytes)
6. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Tue, 4 Jul 2017 17:51:02 -0400; Thank you for the replies. I had some time to circle back to this today and checked a few things. - With the tubes removed, it looks like they have no shorts but the grids measure ~0 ohms (maybe its; /archives//html/Amps/2017-07/msg00001.html (10,979 bytes)
7. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Tue, 4 Jul 2017 15:58:43 -0600; Ron, Thanks for the reply! Correct, they are zero Ohm (after the meter settles) in any direction. When I had the fuses blow the meter lights did not turn on, but I cant comment on the filaments. I wa; /archives//html/Amps/2017-07/msg00002.html (9,691 bytes)
8. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Merv Schweigert via Amps <amps@contesting.com>; Date: Tue, 4 Jul 2017 14:17:41 -1000; If this is the first time you turned it on since doing the mods, you can bet 99 percent that you messed up something when doing the mods, check all the mods and wiring you changed etc. Ron, Thanks fo; /archives//html/Amps/2017-07/msg00003.html (10,808 bytes)
9. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "David Gow" <d.gow@frontier.com>; Date: Tue, 4 Jul 2017 20:49:18 -0700; There is little to be gained by adding a soft start to an SB-220. I don't have the original articles handy any more but it was common knowledge back during the SB-220 production life and confirmed by; /archives//html/Amps/2017-07/msg00004.html (11,412 bytes)
10. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Wed, 5 Jul 2017 00:06:44 -0600; What about any large inrush of current through the on/off switch? -Warren _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2017-07/msg00006.html (12,892 bytes)
11. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Jim Kennedy <kennedyjp@cableone.net>; Date: Wed, 5 Jul 2017 09:46:30 -0400 (EDT); My SB220 with all Harbach modifications and converted to a mono band for 6m developed that same problem a few months later. The problem ended up to be a a diode on the capacitor bank on the Harbach b; /archives//html/Amps/2017-07/msg00009.html (13,874 bytes)
12. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Wed, 5 Jul 2017 11:20:32 -0400; Both the filament and power transformer characteristics are well known BUT the On Off switch is unobtainium and the HV transformer will still thump at times when turned on depending on where in the A; /archives//html/Amps/2017-07/msg00012.html (15,237 bytes)
13. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "David Gow" <d.gow@frontier.com>; Date: Wed, 5 Jul 2017 09:49:08 -0700; I pretty much agree with Carl about the cement resistors. When I rebuilt my Henry 3KA I stuck with good old Ohmite vitreous resistors and was amazed that they are still in production, including the m; /archives//html/Amps/2017-07/msg00015.html (15,264 bytes)
14. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Thu, 6 Jul 2017 00:07:50 -0600; Thank you for the flood of good suggestions. I'm getting closer. Without tubes and with the HV transformer unplugged, the fan and meter lights work. In addition, the step-start fuses dont blow! That; /archives//html/Amps/2017-07/msg00017.html (8,671 bytes)
15. Re: [Amps] SB220 step start blows fuses (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Thu, 6 Jul 2017 05:12:38 -0400; If you have the HV transformer disconnected as you said you added a Molex disconnect, and if you have the amp set for 240 instead of 120v, the fan should not turn with the transformer disconnected, u; /archives//html/Amps/2017-07/msg00018.html (9,817 bytes)
16. Re: [Amps] SB220 step start blows fuses (score: 1): Author: warren@warrenvolz.com; Date: Thu, 06 Jul 2017 10:55:41 -0600; And I keep leaving out important details... Due to the current wiring in my shack and a desire to test I'm running this on 120v. I know this is not the best idea long term, but it does allow me to te; /archives//html/Amps/2017-07/msg00019.html (10,353 bytes)
17. [Amps] SB220 step start blows fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 6 Jul 2017 13:42:56 -0700; <Without tubes and with the HV transformer unplugged, the fan and meter lights work. In addition, the step-start fuses don?t blow! <That leads me to suspect the tubes + HV supply. I checked the windi; /archives//html/Amps/2017-07/msg00020.html (9,344 bytes)
18. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Mark Bitterlich" <markbitterlich@embarqmail.com>; Date: Thu, 6 Jul 2017 19:14:06 -0400; With all the answers from the real experts at hand, I feel safe offering my 2 cents on the topic. If you suffer from an amplifier (or anything else) blowing fuses, like this amp is doing, you need to; /archives//html/Amps/2017-07/msg00021.html (12,919 bytes)
19. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Fri, 7 Jul 2017 01:07:36 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: No, a light bulb is NOT perfect and I'll tell you why. The cold resistance of a light bulb is much lower than when it is hot. Thus the 100 watt light bul; /archives//html/Amps/2017-07/msg00022.html (9,098 bytes)
20. Re: [Amps] SB220 step start blows fuses (score: 1): Author: donroden@hiwaay.net; Date: Fri, 07 Jul 2017 04:45:48 -0500; A series low wattage light bulb may not be "perfect", but it IS a valuable troubleshooting tool IF the user is comfortable working with the amplifier's High Voltage interlocks bypassed or even better; /archives//html/Amps/2017-07/msg00023.html (11,485 bytes)

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