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41. [Amps] SB-200/ SB-220, HL-1000 etc (score: 1): Author: "Edwin Karl" <edk0kl@centurytel.net>; Date: Mon, 30 Nov 2009 15:10:30 -0600; The SB-220 had (has) 2,3-500s in it, actually in the before time I believe it had 2,400s but I may be wrong on that. Covered 80-10 meters. The SB-221 had the same compliment but did not cover 10 mete; /archives//html/Amps/2009-11/msg00314.html (7,896 bytes)
42. [Amps] Svetlana (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Thu, 03 Dec 2009 10:38:03 -0600; Some time ago, Svetlana had a US distribution. There was also a fellow in Texas that seemed to import them (tom's Tubes). Tom is no longer with us, but the main US distribution is also missing. I see; /archives//html/Amps/2009-12/msg00077.html (7,064 bytes)
43. [Amps] Whats watts (!)(?) (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Sun, 06 Dec 2009 12:46:05 -0600; Sorry guys I can't resist the 12-/240 discussion... When I was rebuilding my LK-500B power supply I replaced the caps with humongo caps. I was bothered by the pecular "bong" from the transformers at; /archives//html/Amps/2009-12/msg00169.html (7,350 bytes)
44. [Amps] TL-922 (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Mon, 25 Jan 2010 23:50:53 -0600; The choke is 470 uh, very common in GG 3-500 circuits. By the way looks like one of the mica caps is split. Good luck! Check the biasing diode too, usually goes west when the choke goes out. ed K0KL; /archives//html/Amps/2010-01/msg00336.html (6,378 bytes)
45. [Amps] L-4/L-7 Power Supply (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Tue, 16 Feb 2010 11:15:23 -0600; I'm not sure this is part of the answer to the problem with the buzz, but I think it's worth mentioning again to pass along to the folk. The bleeder resistor arrangement in this power supply is probl; /archives//html/Amps/2010-02/msg00440.html (7,254 bytes)
46. [Amps] Amp keying delay selection (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Sat, 20 Feb 2010 15:02:32 -0600; If you check the manual for the Mark V, menu selection 7-5 sets delay between keying and transmitting the actual character. In other words the amp gets a keying signal 1st and then the RF appears. So; /archives//html/Amps/2010-02/msg00594.html (6,557 bytes)
47. [Amps] Rebuilding (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Wed, 07 Jul 2010 14:25:38 -0500; I used to deal with Freeland Products in LA for klystrons, etc when I was gainfully employed. Now unemployed (retired as it were). Harry Freeland always did high quality work. Not much less than 2500; /archives//html/Amps/2010-07/msg00071.html (6,308 bytes)
48. [Amps] Zener Diodes (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Wed, 11 Aug 2010 15:52:49 -0500; Actually, the problem with 10 watt zeners is they are close to max. in this application. 8 volts x 800 ma +200 ma. grid current = almost the 10 watt rating of the diode. This assumes max power at ful; /archives//html/Amps/2010-08/msg00155.html (6,740 bytes)
49. [Amps] Cooling Tubes (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Mon, 16 Aug 2010 14:24:02 -0500; Install the bigger fan/ blower (after a point I call 'em blower). You can always back the speed down and noise with a series resistor. Then install a thermostat in a strategic place that will short t; /archives//html/Amps/2010-08/msg00262.html (7,042 bytes)
50. [Amps] Lube method (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Fri, 17 Dec 2010 20:03:55 -0600; Hi I have an LK-500B that is on the bench to be cleaned (the "spare" is online) Is there an easy way to lubricate the blower/muffin fan? Ed K0KL _______________________________________________ Amps m; /archives//html/Amps/2010-12/msg00196.html (6,374 bytes)
51. [Amps] Blower lube (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Fri, 24 Dec 2010 19:50:55 -0600; Does anybody have an easy way to lubricate the blower/muffin fan used in LK-500 series amplifier? ed K0KL _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2010-12/msg00354.html (6,129 bytes)
52. Re: [Amps] Blower lube (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Fri, 24 Dec 2010 23:18:05 -0600; Boo, I was afraid of that, but thought I'd try. Thanks and Merry Christmas! _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l; /archives//html/Amps/2010-12/msg00356.html (7,659 bytes)
53. Re: [Amps] Amps Digest, Vol 104, Issue 5 (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Fri, 05 Aug 2011 18:48:06 -0500; I have 2 pair in 2 LK-500 amplifiers, work fine, no problems. Did have a 572 go west on me some time back, tubes from RF Parts, made good on it, no issues ... Good Luck, we're all counting on you! ed; /archives//html/Amps/2011-08/msg00009.html (8,773 bytes)
54. [Amps] Can distilled water be used for a dummy load ?? (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Wed, 30 Nov 2011 08:22:45 -0600; As I recall the water cooled dummy loads used in broadcasting used a resistor material embedded on a glass tube. The water flows through inside of the tube, never touching the resistor. However, if t; /archives//html/Amps/2011-11/msg00178.html (8,237 bytes)
55. [Amps] Linear amplifier tuning (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Tue, 20 Dec 2011 19:20:48 -0600; The discussion about tuning would not happen if we all still used o'scopes with a trapezoid pattern. On such a pattern you can clearly see "flat topping" when the output loading cap is too tight, a s; /archives//html/Amps/2011-12/msg00167.html (7,260 bytes)
56. [Amps] Anti Corona Paint (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Tue, 27 Dec 2011 14:45:24 -0600; Not sure if this will help, but just a tip from your old uncle Ed ... When a high school student, I worked at a TV shop. We sometimes would affect a repair to flyback transformer (tube type sets, rem; /archives//html/Amps/2011-12/msg00232.html (7,459 bytes)
57. [Amps] Relay (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Tue, 24 Jan 2012 21:33:30 -0600; Any idea where I might get a transfer relay for an LK-500B, looks like a DPDT Jennings ... (Cheap) Thanks Ed K0KL _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2012-01/msg00179.html (6,156 bytes)
58. [Amps] Sourcing HV caps (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Thu, 22 Mar 2012 22:11:19 -0500; Wouldn't that low current supply lend itself to a source of Hi-Pot testers ... ? ed K0KL _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2012-03/msg00244.html (6,217 bytes)
59. [Amps] Antennae (?) (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Wed, 11 Jul 2012 19:26:04 -0500; Don't overlook using the ball on top of the vertical antenna. Vertical antennas are end fire devices, they want the RF to go straight out the end. By adding the ball,m the energy reflects off at 90 d; /archives//html/Amps/2012-07/msg00162.html (6,855 bytes)
60. [Amps] Pulser (score: 1): Author: Edwin Karl <edk0kl@centurytel.net>; Date: Mon, 10 Sep 2012 15:48:37 -0500; The theory behind pulsing when tuning is to tune the radio (remember plate and tune controls) without over dissipating the finals (sweep tubes and even the almighty 6146 included). Works just as well; /archives//html/Amps/2012-09/msg00159.html (6,685 bytes)

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