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Total 13 documents matching your query.

1. [AMPS] LK500-ZB (score: 1): Author: knathan@ibm.net (Kevin Nathan); Date: Sat, 07 Feb 1998 18:13:52 -0700; Hello all, I'm new to this list but wanted to jump in and ask a question. I have an Amp Supply LK500-ZB with a fairly noisy cooling fan in it. Does anyone know where to get another that will fit? Als; /archives//html/Amps/1998-02/msg00040.html (6,759 bytes)
2. [Amps] LK500-ZB (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 9 Sep 2009 18:36:50 +0000 (UTC); I saw a thread about LK500 and negative grid current. Was that ever solved? My LK500-ZB is acting up. OK, I think it is my fault, the amp was on, but in standby and I was in the shack hanging a pi; /archives//html/Amps/2009-09/msg00125.html (7,674 bytes)
3. Re: [Amps] LK500-ZB (score: 1): Author: "Roy" <royanjoy@ncn.net>; Date: Wed, 9 Sep 2009 13:45:32 -0500; About: "...No visible damage to the case, but now when the amp is turned on, but in standby, the plate current reads about 200mA and the grid current is pegged negative. Plate voltage is lower than w; /archives//html/Amps/2009-09/msg00126.html (6,840 bytes)
4. Re: [Amps] LK500-ZB (score: 1): Author: TexasRF@aol.com; Date: Wed, 9 Sep 2009 14:54:17 EDT; Has anyone tried to blow a grid to cathode short with a high current pulse of energy? Such as touching the shorted pins for an instant with a car battery. At this point seems not much to loose by try; /archives//html/Amps/2009-09/msg00127.html (7,977 bytes)
5. Re: [Amps] LK500-ZB (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 09 Sep 2009 12:25:51 -0700; Gerald, Tried it a few times on 4-400A's. Sometimes it will clear, but always comes back. Didn't seem to be worth the effort to me, but might have been different if I had more than 5 bux invested in; /archives//html/Amps/2009-09/msg00129.html (9,103 bytes)
6. Re: [Amps] LK500-ZB (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Thu, 10 Sep 2009 06:14:54 +0800; Yep, I've done it and it cleared the fault ok. Only problem is that I am now too chicken to test the tube in the amp. 73, Alek. VK6APK http://www.qrz.com/vk6apk http://www.qrz.com/vk6py _____________; /archives//html/Amps/2009-09/msg00133.html (9,521 bytes)
7. Re: [Amps] LK500-ZB (score: 1): Author: TexasRF@aol.com; Date: Wed, 9 Sep 2009 18:15:21 EDT; I understand that! So, you just keep the tube until it is the last one? Or, sell it to a CB'er on Ebay? 73, Gerald K5GW In a message dated 9/9/2009 5:15:34 P.M. Central Daylight Time, vk6apk@bigpond.; /archives//html/Amps/2009-09/msg00134.html (9,585 bytes)
8. Re: [Amps] LK500-ZB (score: 1): Author: "R. David Eagle" <kb8nnu@yahoo.com>; Date: Wed, 9 Sep 2009 17:39:26 -0700 (PDT); Paul... That was I that was requesting the info about the neagtive grid current on the LK-500 I just got done working on mine. I found last week that the grid shunt resistor was blown and someone on; /archives//html/Amps/2009-09/msg00139.html (8,780 bytes)
9. Re: [Amps] LK500-ZB (score: 1): Author: Gudguyham@aol.com; Date: Wed, 9 Sep 2009 22:36:59 EDT; just got done working on mine. I found last week that the grid shunt resistor was blown and someone on the list here suggested that it may be exactly that and it was! ________________________________; /archives//html/Amps/2009-09/msg00141.html (7,355 bytes)
10. Re: [Amps] LK500-ZB (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 11 Sep 2009 13:09:33 +0000 (UTC); Thanks to all that replied. At this point, I think a tube has gone bad. Removing the "bright" tube, the amp can be loaded up and produces output. Swapping the sockets, the problem seems to follo; /archives//html/Amps/2009-09/msg00149.html (8,890 bytes)
11. Re: [Amps] LK500-ZB (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 11 Sep 2009 08:22:19 -0500; It's good that you're able to move the trouble with the tube. First, ohm the tube out, each pin and the plate cap to each other pin and the plate cap; record the results -- or have someone else recor; /archives//html/Amps/2009-09/msg00150.html (9,331 bytes)
12. Re: [Amps] LK500-ZB (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 11 Sep 2009 07:50:23 -0700; Between ONE of the filament pins and the grid! Across the filament would of course destroy it. My experience with these tubes has been that it's common to see a short that develops only after the fil; /archives//html/Amps/2009-09/msg00151.html (7,773 bytes)
13. Re: [Amps] LK500-ZB (score: 1): Author: TexasRF@aol.com; Date: Fri, 11 Sep 2009 12:44:44 EDT; It seems there could be a risk of excess filament current if the "wrong" filament pin is selected. To minimize the risk of this, both filament pins can be connected together and the "zapper" connects; /archives//html/Amps/2009-09/msg00153.html (8,359 bytes)

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