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21. [Amps] SB220 step start blows fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 7 Jul 2017 09:23:06 -0700; <Because of all the above, IMO, a better way is to use a Variac to <slowly bring up the voltage while monitoring the current. Variacs are <widely available on eBay. Every ham shack should have one. <; /archives//html/Amps/2017-07/msg00024.html (10,067 bytes)
22. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Fri, 7 Jul 2017 16:34:09 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: At the very low end of its range, a Variac limits current just fine. I worked as a calibration technician at Tektronix for years, taking brand new scopes; /archives//html/Amps/2017-07/msg00025.html (8,894 bytes)
23. Re: [Amps] SB220 step start blows fuses (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Fri, 7 Jul 2017 14:58:00 -0400; I know I sound like a broken record but yes, a Variac is the way to go. Especially with amps that can have power supply problems and gassy tubes. You will hear the plate transformer groan and won't s; /archives//html/Amps/2017-07/msg00026.html (10,215 bytes)
24. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Warren Volz <warren@warrenvolz.com>; Date: Sun, 9 Jul 2017 20:52:40 -0600; I may shortly be looking to purchase a variac. After building a dim bulb tester this weekend I have a minor update. With 120V connected, the HV primary disconnected and one tube in a socket (doesnt m; /archives//html/Amps/2017-07/msg00038.html (11,548 bytes)
25. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Sun, 9 Jul 2017 22:20:21 -0500; You don't have a big enough bulb. I use two 300 watt bulbs in parallel. 300 watt bulbs are about the largest you can find easily. I made up the bulb unit using a square electrical box and mounted two; /archives//html/Amps/2017-07/msg00039.html (13,345 bytes)
26. Re: [Amps] SB220 step start blows fuses (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Mon, 10 Jul 2017 05:08:26 -0400; If you have no HV on the tube all you are doing is lighting the filament unless you have a HARD short that would be detectable with an ohm meter. I am thinking that you have the fan hooked up wrong a; /archives//html/Amps/2017-07/msg00040.html (12,609 bytes)
27. Re: [Amps] SB220 step start blows fuses (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Jul 2017 07:31:13 -0500; I think you are seeing a normal condition . Measure the voltage at the input of the Amp. Use a light wattage that gives at least 1/2 voltage at the amp. Your filament transformer appears to be fine.; /archives//html/Amps/2017-07/msg00041.html (12,594 bytes)
28. Re: [Amps] SB220 step start blows fuses (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Jul 2017 07:50:05 -0500; Agree with Gary !! Make a tester out of a garage light with a 300 or 500 watt halogen element. ( or pair ) relatively inexpensive and I always need an extra light when looking for things in my garage; /archives//html/Amps/2017-07/msg00042.html (13,484 bytes)
29. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 10 Jul 2017 09:32:47 -0400; I use a pair of 300W stadium lights with sockets I found at a fleamarket decades ago. It makes the initial tests foolproof. Carl -- Original Message -- From: "Gary Schafer" <garyschafer@largeriver.ne; /archives//html/Amps/2017-07/msg00044.html (14,195 bytes)
30. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Jim Garland <4cx250b@miamioh.edu>; Date: Mon, 10 Jul 2017 08:10:54 -0600; I've been reading this thread for some time, and while I agree with many of the suggestions (i.e., light bulb testers, variacs), I don't believe any of these are necessary to diagnose this fault. The; /archives//html/Amps/2017-07/msg00045.html (16,048 bytes)
31. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Joe <nss@mwt.net>; Date: Mon, 10 Jul 2017 09:25:47 -0500; If you were to use this light bulb current limiter safety thing, but on a 220 variac, I assume you would have to put a light into each leg true? Joe WB9SBD Sig The Original Rolling Ball Clock Idle Ty; /archives//html/Amps/2017-07/msg00046.html (15,311 bytes)
32. Re: [Amps] SB220 step start blows fuses (score: 1): Author: donroden@hiwaay.net; Date: Mon, 10 Jul 2017 09:46:48 -0500; If the amp uses 110vac for fans or control, the fans wouldn't run but if there were manual 220vac switches, it would be OK with a single bulb. Depends on how much computer control your amp has. Don W; /archives//html/Amps/2017-07/msg00047.html (16,281 bytes)
33. Re: [Amps] SB220 step start blows fuses (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 10 Jul 2017 10:49:34 -0400; If you were to use this light bulb current limiter safety thing, but on a 220 variac, I assume you would have to put a light into each leg true? No, not at all, being a 220 Volt device neutral is unk; /archives//html/Amps/2017-07/msg00048.html (9,489 bytes)
34. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Mon, 10 Jul 2017 12:41:52 -0500; Well, yes you would need a bulb in each side of the 220 circuit or two bulbs in series (rather than parallel) on one side, assuming that the amp is not a 4 wire amp that also uses 120 volts. If somet; /archives//html/Amps/2017-07/msg00049.html (18,447 bytes)
35. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Mon, 10 Jul 2017 12:46:52 -0500; That's a lot of fuses. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2017-07/msg00050.html (17,716 bytes)
36. [Amps] SB220 step start blows fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 11 Jul 2017 07:29:01 -0700; Well, yes you would need a bulb in each side of the 220 circuit or two bulbs in series (rather than parallel) on one side, assuming that the amp is not a 4 wire amp that also uses 120 volts. If somet; /archives//html/Amps/2017-07/msg00054.html (9,200 bytes)
37. [Amps] SB220 step start blows fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 11 Jul 2017 07:39:39 -0700; 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 don?t blow! That; /archives//html/Amps/2017-07/msg00055.html (8,692 bytes)
38. Re: [Amps] SB220 step start blows fuses (score: 1): Author: donroden@hiwaay.net; Date: Tue, 11 Jul 2017 10:10:47 -0500; The problem with this approach is that with two 60-100 watt bulbs *IN SERIES*, there is too much resistance to "wake up" the amp. It's difficult enough to try to "fix" an amp over the internet, and e; /archives//html/Amps/2017-07/msg00056.html (11,478 bytes)
39. [Amps] SB220 step start blows fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 11 Jul 2017 08:16:20 -0700; I may shortly be looking to purchase a variac. After building a dim bulb tester this weekend I have a minor update. With 120V connected, the HV primary disconnected and one tube in a socket (doesn?t; /archives//html/Amps/2017-07/msg00057.html (9,476 bytes)
40. Re: [Amps] SB220 step start blows fuses (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Tue, 11 Jul 2017 12:28:20 -0500; That's why in the first post I said that he needed a larger bulb. When operated on 240 volts the amp will draw half the current that it would draw on 120 volts so two of the large bulbs in series on; /archives//html/Amps/2017-07/msg00058.html (12,801 bytes)

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