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Total 9 documents matching your query.

1. [Amps] Harbach metering board in SB-220 (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Fri, 07 Mar 2014 07:14:52 -0500; I am trying to understand a minor problem in my SB-220, which otherwise works fine. I originally installed the Harbach board because the HV was reading low. It fixed that, but quite quickly thereafte; /archives//html/Amps/2014-03/msg00023.html (7,010 bytes)
2. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: "Bob Alexander" <realex2@verizon.net>; Date: Fri, 07 Mar 2014 07:02:48 -0600; Hi Pete, If the Grid meter works OK the only thing common to the HV and rel. out is the three position switch on the front panel. Ive replaced one or two over the years on 220s I've rerbuilt/restored; /archives//html/Amps/2014-03/msg00024.html (7,488 bytes)
3. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: "Mike & Becca Krzystyniak" <k9mk@flash.net>; Date: Fri, 7 Mar 2014 07:18:25 -0600; I worked on a SB220 recently that had a wire along with copper pad lift off the original PCB (opening the circuit) and was floating a few mils behid the PCB. Of course it was hard to see as it was bo; /archives//html/Amps/2014-03/msg00025.html (8,006 bytes)
4. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 7 Mar 2014 09:55:59 -0500; Ive had many of those boards fail due to the 1/4 W metering resistors used. Last I heard Jeff was going to come out with an update using real HV resistors. The tiny 1N4007's used in the bias are also; /archives//html/Amps/2014-03/msg00026.html (9,216 bytes)
5. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: Louis Parascondola <gudguyham@aol.com>; Date: Fri, 7 Mar 2014 11:53:55 -0500 (EST); I have original function switches for sale. I also have a prototype of the new Harbach rectifier board. Its been updated with the big diodes and 3 good metering resistors Sent from AOL Mobile Mail <d; /archives//html/Amps/2014-03/msg00027.html (11,566 bytes)
6. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: Louis Parascondola <gudguyham@aol.com>; Date: Fri, 7 Mar 2014 18:11:36 -0500 (EST); That board is being phased out. My board has 14 in a string. My board has 14 in a string. 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspo; /archives//html/Amps/2014-03/msg00028.html (11,689 bytes)
7. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Sat, 08 Mar 2014 06:51:53 -0500; Yes, but not yet - I e-mailed Jeff yesterday and he does not yet have the new boards or the resistors in stock. 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at; /archives//html/Amps/2014-03/msg00029.html (12,216 bytes)
8. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: Bryan Swadener <bswadener@yahoo.com>; Date: Sat, 8 Mar 2014 12:21:51 -0800 (PST); Heath used three 4M7/5%/1W Carbon Composition resistors in the series leg of the HV meter multiplier (R6, R7, R8). Those, or the 14 1M0/5%/0.25W Metal Film resistors W8CQ used can be replaced with th; /archives//html/Amps/2014-03/msg00030.html (8,468 bytes)
9. Re: [Amps] Harbach metering board in SB-220 (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 09 Mar 2014 07:59:40 +0100; string to chassis. Its value is uncritical, as its function is only to prevent the bottom end of the 3x 4M7 string from soaring to HV when the meter switch is NOT in the "HV" position.< Which is mor; /archives//html/Amps/2014-03/msg00031.html (8,391 bytes)

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