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References: [ +from:cherokeehillfarm@earthlink.net: 76 ]

Total 76 documents matching your query.

61. Re: [Amps] Heath SB220 Zener Replacement (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Wed, 01 Nov 2006 17:34:45 -0500
A string of 2.5 amp silicon rectifiers, with any PIV rating, with a .01uF cap across the string, can be substituted for the zener diode. I added diodes into the string until the idling current for th
/archives//html/Amps/2006-11/msg00017.html (9,278 bytes)

62. Re: [Amps] Sticky blower (score: 1)
Author: cherokeehillfarm@earthlink.net
Date: Thu, 9 Nov 2006 07:43:15 -0500 (EST)
--Original Message-- Jerry: Before you go too far with issues about the bearings and so on, check and see if there is a dropping resistor used to moderate the blower speed. Perhaps this resistor has
/archives//html/Amps/2006-11/msg00140.html (7,322 bytes)

63. Re: [Amps] QST laments TSPA (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Mon, 18 Dec 2006 15:44:29 -0500
Hello Jim: QEX is available to all nonmembers of the ARRL. At $36 the subscription costs $12 more for a nonmember. For ARRL Members: US via periodical class mail: $24 US via 1st class mail: $37 Elsew
/archives//html/Amps/2006-12/msg00152.html (7,997 bytes)

64. Re: [Amps] 3CV1500A7 (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Tue, 6 Feb 2007 13:07:15 -0500
Why not let a rebuilder like Econco give it a go and have them quote a price for retro fitting the old boiler onto a new tube? They may have done this before. Mike W2AJI for not the the water amp ___
/archives//html/Amps/2007-02/msg00090.html (13,101 bytes)

65. Re: [Amps] 3CV1500A7 (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Tue, 6 Feb 2007 13:12:01 -0500
Good information, thanks Paul. Mike W2AJI _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-02/msg00091.html (7,924 bytes)

66. [Amps] Reliable Source for GU 78B (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Tue, 22 May 2007 21:43:54 -0400
Hello Amp Fans: Looking for a recommendation for a source of new GU 78B tubes. A competitive price would also be important, but reliable quality, product warrantee, and good service are most importan
/archives//html/Amps/2007-05/msg00157.html (6,436 bytes)

67. Re: [Amps] AL-82 Zener problems (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Mon, 28 May 2007 21:51:18 -0400
Hello Joe: The Zener diode doesn't handle spikes very well, even a small current spike can easily destroy your bias supply. Since you seem to return to normal operation after replacing the diode, it
/archives//html/Amps/2007-05/msg00239.html (10,112 bytes)

68. Re: [Amps] Jennings and Kilovac vacuum relays for sale (score: 1)
Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>
Date: 8 Jul 2007 03:57:45 GMT
I can add that I have been using the GH-1 HAM for several years now with no problems whatsoever. My QSK projects have included trios of 8874 and 3CPX800A7, and the relays handle the power with no pro
/archives//html/Amps/2007-07/msg00082.html (8,440 bytes)

69. Re: [Amps] Multiple Model Numbers (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Sat, 28 Jul 2007 12:17:21 -0400
Hello Ed: The two owners were partners at one time, now they are two separate entities. Command prefers triode technology, and QRO designs with tetrodes. 73 and Happy DXing, Mike W2AJI -- Original Me
/archives//html/Amps/2007-07/msg00485.html (26,729 bytes)

70. Re: [Amps] Alpha 87A Tubes 3CX800A7 and the 3CX P 800A7 (score: 1)
Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>
Date: Mon, 31 Dec 2007 12:10:18 -0500
About 30 mils per triode max key down. If your grid current shunt is ok, the tubes may be soft. 73, Mike W2AJI What would typical grid current be for an Alpha 87A running 1500w on 20 or 40m? My 87A g
/archives//html/Amps/2007-12/msg00289.html (28,329 bytes)

71. Re: [Amps] Silver (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Tue, 12 Feb 2008 10:40:18 -0500
Hello Amp Fans: The tarnish which you wish to clean is actually silver sulfide, not silver oxide. Silver is a wonderful getter for sulfur ions. Silver has the wonderful property of only oxidizing at
/archives//html/Amps/2008-02/msg00058.html (8,827 bytes)

72. Re: [Amps] Wire (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Mon, 28 Jul 2008 14:45:02 -0400
Hello Larry: Actually, the main aerospace criteria for the wider use of Tefzel has to do with the overall weight and ampacity of the wiring system. The Tefzel dielectric permits thinner walls, with h
/archives//html/Amps/2008-07/msg00341.html (13,855 bytes)

73. Re: [Amps] help with corona discharge (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Wed, 12 Nov 2008 11:55:26 -0500
Every Commander amp that I have added QSK and vacuum relays to has had the blue glow when looking through the cooling fins.. The three holer on my desk, with brand new 3cpx800 tubes, glows blue. The
/archives//html/Amps/2008-11/msg00128.html (8,424 bytes)

74. Re: [Amps] Vacuum Relay Issues (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Mon, 01 Dec 2008 13:13:14 -0500
Hello Tom: I would agree with Vic that hot switching is a potential cause for contact failure in relays. It is possible that the Emtron circuit is not properly designed, and this is a root cause of t
/archives//html/Amps/2008-12/msg00015.html (10,965 bytes)

75. Re: [Amps] SB200 on 6m & my take (score: 1)
Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>
Date: Fri, 13 Mar 2009 16:43:42 -0400
Hello Steve: I just finished rebuilding my old SB-200 with a new power supply and new cooling. I just shipped it to a ham on St. Thomas, USVI. This was the last one of those amps I built in 1968, and
/archives//html/Amps/2009-03/msg00398.html (9,785 bytes)

76. Re: [Amps] Zero signal current 3CPX800A7 (score: 1)
Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>
Date: Sat, 4 Apr 2009 22:08:10 -0400
Hello Amp Fans: I run a trio of 3CPX800A7. Key down high voltage is about 3.2 KV, and zero signal at that time is about 250 mils. This is about 80 mils per tube. The amp is very clean, and will drive
/archives//html/Amps/2009-04/msg00051.html (10,224 bytes)

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