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1. [Amps] SB220 Meter blown (score: 1): Author: Artek Manuals <Manuals@ArtekManuals.com>; Date: Fri, 15 May 2020 11:10:06 -0400; I am resurrecting a SB220 that had an apparent classic Grid/plate short event. One of casualties appears to be the right hand meter movement. This is the one for Grid Current and HV. I am pretty far; /archives//html/Amps/2020-05/msg00009.html (6,923 bytes)
2. [Amps] SB220 Meter blown (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 15 May 2020 09:13:44 -0700; <I am resurrecting a SB220 that had an apparent classic Grid/plate short <event. One of casualties appears to be the right hand meter movement. <This is the one for Grid Current and HV. I am pretty f; /archives//html/Amps/2020-05/msg00010.html (7,483 bytes)
3. Re: [Amps] SB220 Meter blown (score: 1): Author: Artek Manuals <Manuals@ArtekManuals.com>; Date: Fri, 15 May 2020 13:14:26 -0400; Comments below <I am resurrecting a SB220 that had an apparent classic Grid/plate short <event. One of casualties appears to be the right hand meter movement. <This is the one for Grid Current and HV; /archives//html/Amps/2020-05/msg00011.html (9,730 bytes)
4. Re: [Amps] SB220 Meter blown (score: 1): Author: Robert Arenella <rja12@comcast.net>; Date: Fri, 15 May 2020 14:51:24 -0400; Contact Lou, W1QJ. He does 6 Meter conversions on SB-220's among others. Ha may have what you need. 73, Bob / N2OAM <I am resurrecting a SB220 that had an apparent classic Grid/plate short <event. On; /archives//html/Amps/2020-05/msg00014.html (9,612 bytes)
5. Re: [Amps] SB220 Meter blown (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Sat, 16 May 2020 07:08:17 +1000; from ; http://www.somis.org/sb-220ci.html "6. Meter damage can be avoided by connecting two, ordinary = or >1A, any PIV, silicon rectifiers across the terminals on each meter. The two diode arrows sh; /archives//html/Amps/2020-05/msg00017.html (8,636 bytes)
6. Re: [Amps] SB220 Meter blown (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Fri, 15 May 2020 18:45:36 -0400; For meter protection I also use back-to-back diodes across meter terminals. However, rather than using rectifier diodes, I use fast small signal diodes, like the 1N914a. Aside from responding more qu; /archives//html/Amps/2020-05/msg00018.html (8,884 bytes)
7. Re: [Amps] SB220 Meter blown (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Fri, 15 May 2020 22:19:53 -0500; WRONG. .6 or .7 or slightly more during an "event" volts is still enough to blow up the meter. Thanks 73 Jim W7RY "6. Meter damage can be avoided by connecting two, ordinary = or >1A, any PIV, silico; /archives//html/Amps/2020-05/msg00020.html (9,922 bytes)
8. Re: [Amps] SB220 Meter blown (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sat, 16 May 2020 06:30:38 +0300; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2020-05/msg00021.html (8,279 bytes)
9. Re: [Amps] SB220 Meter blown (score: 1): Author: "Adrian" <vk4tux@gmail.com>; Date: Sat, 16 May 2020 13:43:48 +1000; Well the shunt diode both ways protection method certainly saved my sb-220 meter in the past, So I just don't believe you W7FRY. Good diodes should be checked after install, after any 'event' to chec; /archives//html/Amps/2020-05/msg00022.html (10,545 bytes)
10. Re: [Amps] SB220 Meter blown (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Fri, 15 May 2020 22:49:27 -0500; Its W7RY whoever you are.... Thanks 73 Jim W7RY On 5/15/2020 10:43 PM, Adrian wrote: Well the shunt diode both ways protection method certainly saved my sb-220 meter in the past, So I just don't beli; /archives//html/Amps/2020-05/msg00023.html (10,660 bytes)
11. Re: [Amps] SB220 Meter blown (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 16 May 2020 06:41:58 -0500; W8ZR is 100% CORRECT. You DON'T JUST WILLY NILLY SLAP ANY OLD DIODE ACROSS A METER! 73 Rob K5UJ -- For meter protection I also use back-to-back diodes across meter terminals. However, rather than usi; /archives//html/Amps/2020-05/msg00024.html (8,846 bytes)
12. Re: [Amps] SB220 Meter blown (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Sat, 16 May 2020 22:17:34 +1000; I would rather follow Rich's advice on the subject as per my previous link. contained withjin ; "It may take more than one diode to protect a meter shunt resistor. A silicon diode begins to conduct a; /archives//html/Amps/2020-05/msg00025.html (11,127 bytes)
13. Re: [Amps] SB220 Meter blown (score: 1): Author: donroden@hiwaay.net; Date: Sat, 16 May 2020 09:24:28 -0500; And back when the SB220 was built, meters were $3 each. Today, if you want to protect the appearance and functionality of your GG Amp's meters, I'd suggest adding an op-amp interface to prevent high; /archives//html/Amps/2020-05/msg00026.html (10,986 bytes)
14. Re: [Amps] SB220 Meter blown (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Sat, 16 May 2020 13:57:58 -0500; Jim is correct. It depends on the meter circuit that is used. You need to calculate how much voltage will appear at the meter. I have a drake L7 that I added protection diodes to. I was going to just; /archives//html/Amps/2020-05/msg00028.html (12,082 bytes)
15. Re: [Amps] SB220 Meter blown (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Sun, 17 May 2020 05:15:11 +1000; The diodes(s) should be direct across the meter, and enough in series as needed to excedd the full scale deflection voltage required before forward bias is achieved in the diodes. It's all very simpl; /archives//html/Amps/2020-05/msg00029.html (14,701 bytes)
16. [Amps] SB220 Meter blown (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 17 May 2020 13:19:26 -0700; thats called a ..HARD fault. Even with 2 x diodes in series..so meter accuracy is not affected in normal operation, the diodes will be into conduction so fast, the meter wont even begin to deflect. B; /archives//html/Amps/2020-05/msg00032.html (12,206 bytes)
17. Re: [Amps] SB220 Meter blown (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 17 May 2020 20:05:30 -0400; Jim, Just curious as to how you're implementing the HV fuse on the HV XFMR secondary to prevent it from blowing during the initial inrush of the filter cap charging (assuming C input). Obviously, st; /archives//html/Amps/2020-05/msg00033.html (8,213 bytes)
18. Re: [Amps] SB220 Meter blown (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Mon, 18 May 2020 09:59:52 +0100; Rich was talking about putting diodes across the current measuring resistor, not directly across the meter itself. Typically the resistor generates something in the region of 0.5-2V which the meter r; /archives//html/Amps/2020-05/msg00034.html (10,675 bytes)
19. Re: [Amps] SB220 Meter blown (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Mon, 18 May 2020 19:41:38 +1000; The shunt resistor is across the meter to set the working range of application for the FSD corresponding to the full range of measurement. , that's why it is called a shunt resistor. The protection d; /archives//html/Amps/2020-05/msg00035.html (12,011 bytes)
20. Re: [Amps] SB220 Meter blown (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Mon, 18 May 2020 20:03:44 +1000; The shunt resistor is across the meter to set the working range of application for the FSD corresponding to the full range of measurement. , that's why it is called a shunt resistor. The protection d; /archives//html/Amps/2020-05/msg00036.html (9,504 bytes)

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