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41. Re: [Amps] 3-400 (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sat, 02 Feb 2008 09:12:11 -0500; My Henry 2K manual states 250-280 ma grid current for a pair. I would say that 500-600 is excessive! Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com h; /archives//html/Amps/2008-02/msg00002.html (6,849 bytes)
42. Re: [Amps] Higher power transmitting tubes for "portable" amps. (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Fri, 23 May 2008 08:01:03 -0400; The military likes 4CX1500's as they are designed to operate in any position under several g's of shock. The bayonet socket also holds the tube securely. 4CX1500's are plentiful and cheap, but the so; /archives//html/Amps/2008-05/msg00170.html (8,650 bytes)
43. Re: [Amps] How to safely clean an amplifier? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sat, 31 May 2008 12:48:00 -0400; An old toothbrush or stiff brush to loosen the dirt and vacuum it up. Clean glassware with 99.9% Isoprophyl alcohol CAREFULLY as to not remove the lettering. Keep from touching the clean glass with f; /archives//html/Amps/2008-05/msg00217.html (8,525 bytes)
44. Re: [Amps] Non Detergent motor oil for dummy loads????? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Fri, 05 Dec 2008 15:43:45 -0500; Johnson's Baby Oil will work if you don't mind the smell. It is pure mineral oil with a fragrance added. You may be able to find pure mineral oil at the local drug store that does not have a fragranc; /archives//html/Amps/2008-12/msg00112.html (8,593 bytes)
45. Re: [Amps] HV wire (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Tue, 23 Dec 2008 08:29:44 -0500; I have always used 10,000 volt test prod wire like Belden 8898 available from Allied in 25' spools. The 5000 volt 8899 I use internally. Mike, W1NR _______________________________________________ Amp; /archives//html/Amps/2008-12/msg00300.html (8,200 bytes)
46. Re: [Amps] The SB220 Mystique (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Tue, 10 Feb 2009 14:42:32 -0500; Cheap and plentiful. That's the bottom line. They are not the most reliable, especially aged ones, and intolerant of abuse, but they are easy to fix when they do break. Mike, W1NR ___________________; /archives//html/Amps/2009-02/msg00277.html (8,304 bytes)
47. Re: [Amps] SB-220 Kit link. 2nd try (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sat, 14 Feb 2009 15:11:03 -0500; Just go there and punch the item # into the search... 170301759918 Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman; /archives//html/Amps/2009-02/msg00452.html (7,413 bytes)
48. Re: [Amps] SB-220 Kit link. 2nd try (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sat, 14 Feb 2009 19:19:14 -0500; I would guess near $2000. If you wanted to build one, buy one already made, disassemble it, replace all the aged components and re-assemble by the book. I am in the process of doing that with a Marau; /archives//html/Amps/2009-02/msg00457.html (8,343 bytes)
49. Re: [Amps] Question for All Amp Builders... (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Fri, 20 Feb 2009 08:22:46 -0500; Any ARRL Handbook or Bill Orr's Radio Handbook (Out of print for a while) have tables and formulas for calculating the tank circuits. There is also this spreadsheet by G3SEK based on the formulas in; /archives//html/Amps/2009-02/msg00585.html (8,039 bytes)
50. Re: [Amps] 47ohm 2W resistor, who still has them? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sat, 21 Feb 2009 18:03:34 -0500; They ain't made no more so any you do find are going to be old stock. Ceramic composition are what I have been using as replacements. Ohmite type OY specifically part number 588-OY-47-E. $1.20 at Mou; /archives//html/Amps/2009-02/msg00627.html (8,661 bytes)
51. Re: [Amps] Doorknob quality (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sun, 22 Feb 2009 08:20:15 -0500; Take a look at http://www.qsl.net/i0jx/capacit.html for some advice. Too bad I just sold a 500pf type 859 at a flea market recently... I would try and find a surplus vacuum capacitor and a vacuum rel; /archives//html/Amps/2009-02/msg00642.html (8,562 bytes)
52. Re: [Amps] Acom 1000 caps? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Thu, 05 Mar 2009 14:59:29 -0500; 220 uF is fine. I would go with the highest value that I can find that has the same case size. That will give you better regulation. Mike, W1NR _______________________________________________ Amps ma; /archives//html/Amps/2009-03/msg00160.html (8,783 bytes)
53. Re: [Amps] HV measurements (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Mon, 09 Mar 2009 18:18:53 -0400; I use a B&K PR28 High Voltage probe. It has a 1000x multiplication factor so 1V reading on the meter is 1KV at the probe. Mike, W1NR _______________________________________________ Amps mailing list; /archives//html/Amps/2009-03/msg00266.html (7,614 bytes)
54. Re: [Amps] russian door knob caps for R Ftank circuit (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Thu, 07 May 2009 07:25:02 -0400; Parallel caps distribute the currents so 4 caps in parallel pass 1/4 the current through each. Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2009-05/msg00028.html (7,329 bytes)
55. Re: [Amps] Tubes in Alphas (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Mon, 13 Jul 2009 10:51:41 -0400; Yup, and availability. Both available from multiple chinese manufacturers as well as Eimac. Also, I suspect the 4CX1000's were retrofitted to the (now unobtainable ) 4CX800 design. Mike, W1NR _______; /archives//html/Amps/2009-07/msg00181.html (7,775 bytes)
56. Re: [Amps] How do you measure HV with reasonable accuracy? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Fri, 07 Aug 2009 07:26:58 -0400; On the e-place there is a company that has a quantity of Fluke 27/FM multimeters w/ 80K6 HV probes for $65. I bought one some time ago and am very pleased with it. They are ex military, comes with ca; /archives//html/Amps/2009-08/msg00120.html (8,973 bytes)
57. Re: [Amps] Carbon Resistor Substitution (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Wed, 02 Sep 2009 12:35:32 -0400; Try ceramic composition instead. http://www.ohmite.com/cgi-bin/showpage.cgi?product=ox_oy_series Available at Mouser, Digikey, etc. Mike, W1NR _______________________________________________ Amps mai; /archives//html/Amps/2009-09/msg00019.html (6,924 bytes)
58. Re: [Amps] Henry 2K-2 (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Thu, 08 Oct 2009 20:44:24 -0400; Are you sure they are 4-400's? My 2K (early model with no "dash") originally came with 3-400's. In any case, 3-400 to 3-500 requires new chimneys and a little extension to the parasitic chokes to mak; /archives//html/Amps/2009-10/msg00149.html (7,696 bytes)
59. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Wed, 04 Nov 2009 10:10:25 -0500; Bonding the neutral to ground at the appliance is OK ONLY when it is fed with the old 3 wire system that has no neutral running from the service panel. These systems are grandfathered. It is NOT OK t; /archives//html/Amps/2009-11/msg00047.html (9,270 bytes)
60. Re: [Amps] Who sells black rope? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sun, 22 Nov 2009 19:59:56 -0500; I got a couple of spools of black and olive drab green Dacron at Bananas Army Navy on the Cape. Google for surplus Dacron rope as it is UV and weather/rot resistant. Much more so than nylon. Mike, W1; /archives//html/Amps/2009-11/msg00229.html (7,655 bytes)

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