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41. [Amps] Plate Choke Selection (score: 1): Author: "Pat Barthelow" <aa6eg@hotmail.com>; Date: Thu, 20 Sep 2007 17:52:39 -0700; Folks: I am reconstructing an old 813 Amplifier, that is missing a plate chioke, the original of which was the well recognized National Radio, Ceramic choke form with segmented sections of different; /archives//html/Amps/2007-09/msg00215.html (7,156 bytes)
42. Re: [Amps] HF amp output power dropping (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 29 Sep 2007 14:23:19 -0700; Last time I had this happen it was the antenna. I think something was getting hot and changing the match. I am sure you are tuning it into a dummy load, so it can't be that. However, it was possibly; /archives//html/Amps/2007-09/msg00498.html (8,982 bytes)
43. [Amps] Vacuum Ant Relay; Sell (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Wed, 3 Oct 2007 17:26:49 -0700; For sale: A Vacuum Ant Relay, SO-239 connectors x 3; Labeled COM, N.O. N.C. , machined aluminum relay capsule enclosure, with two screw coil terminal block. Coil terminals inside housing labeled L1;; /archives//html/Amps/2007-10/msg00031.html (11,115 bytes)
44. Re: [Amps] 8877 Grid Trip Timing (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Thu, 4 Oct 2007 09:33:14 -0700; Karl-Arne wrote in part: Hard to fathom that ability to protect such high energy circuits, from faults... Kind of like the Master swordsman from Japan who worked with Tom Cruise, and was able to cont; /archives//html/Amps/2007-10/msg00039.html (10,744 bytes)
45. [Amps] EIMAC APP NOTES, COMPLETE (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 6 Oct 2007 19:10:54 -0700; I came across a complete collection of EIMAC Application notes, including price sheets, and Indexes. Anyone remember roughly what year an 8877 was retail $200? Or a 3-500Z was $37.00, or a 3-1000 was; /archives//html/Amps/2007-10/msg00066.html (8,307 bytes)
46. Re: [Amps] Henry 2K (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sun, 7 Oct 2007 07:50:33 -0700; Lots of Pics, Free manuals, mods, case histories of the Henry 2K and it's siblings, on the web: http://www.bearlabs.com/ARCH/HENRYWEB/HENRY2html http://www.n5tml.com/amp's.htm ftp://bama.sbc.edu/down; /archives//html/Amps/2007-10/msg00074.html (7,774 bytes)
47. [Amps] Jennings Vacuum Ant Relay (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Thu, 18 Oct 2007 17:10:37 -0700; Sell: Jennings Vacuum Ant Relay Metal Encased, Battlship Grey Paint N Connectors Rectangular base: 2.7" x 2.1" X 1" CONTAINING 3 "N" Females and flange mount, with 4 screw holes Cylindrical Vacuum Ch; /archives//html/Amps/2007-10/msg00218.html (7,174 bytes)
48. [Amps] Anode Coolers, Aluminum, and Brass (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Thu, 18 Oct 2007 17:54:13 -0700; 2 Each, Aluminum, Horizontal Fins Tall 1.36 diameter, 8 horizontal machined fins 1.32 Height Plate Hole measures 1.21" +- Fits 4-400A plate pin Set Screw Clamp screw $15 ea 2 Each, Brass, Smaller .74; /archives//html/Amps/2007-10/msg00220.html (6,699 bytes)
49. Re: [Amps] HAPPY! (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Mon, 12 Nov 2007 18:13:57 -0800; Thomas, Post a photo of the Capacitor in situ, and maybe some tape measure measurements, of the space available to the capacitor,I will see if I can match. Or, I have a collection: Look at these pict; /archives//html/Amps/2007-11/msg00185.html (9,008 bytes)
50. Re: [Amps] Bird 1KW+ Load Resistor/possible danger ! (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 17 Nov 2007 10:22:52 -0800; I have a good old reliable dummy load, as shown in the picture: http://groups.msn.com/TUVAORBUST/rfparts.msnw?action=ShowPhoto&PhotoID=5 I havent looked into how one replaces or checks the cooling oi; /archives//html/Amps/2007-11/msg00228.html (11,429 bytes)
51. Re: [Amps] Bird 1 KW (etc) (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 17 Nov 2007 14:06:30 -0800; .. Hi Roy, et al, Actually, most of it came from Bill Orr's ( W6SAI ) estate a few year's back. And I visited his family's QTH in Palo Alto after the giant garage sale happened. These were leftovers.; /archives//html/Amps/2007-11/msg00235.html (7,399 bytes)
52. Re: [Amps] BeO in tubes/tinwhiskers (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sun, 18 Nov 2007 14:54:08 -0800; SNIP lots of material re BeO RE the Tin whiskers, take a look at this: http://nepp.nasa.gov/whisker/anecdote/2003rf_enclosure/index.html Professor Todd Weatherford KI8CX, at the Navy School in Monter; /archives//html/Amps/2007-11/msg00264.html (9,240 bytes)
53. Re: [Amps] Roller inductor & wiper "grease"" (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sun, 25 Nov 2007 16:10:07 -0800; It would tell a lot to do a ohmeter check of some of the black goo on a glass plate. Its interesting that Clint found some some conductive grease that does not rely on granular particles as a slurry; /archives//html/Amps/2007-11/msg00367.html (12,490 bytes)
54. Re: [Amps] What is the best way to run a pair of 4-1000 tubesgrounded Grid or another way? For 10 t (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 22 Dec 2007 10:33:54 -0800; Ummm... Won't a SINGLE 4-1000A amp properly designed, and using relatively high(er) voltage on the plate, easily run full Amateur legal limit on 160 through 10? In every mode, except perhaps 100 perc; /archives//html/Amps/2007-12/msg00206.html (8,540 bytes)
55. Re: [Amps] What is the best way to run a pair of 4-1000 tubes (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sun, 23 Dec 2007 09:02:46 -0800; Another question(s) re 4-1000As. I see them pretty regularly at ham swap meets, used and cheap. Often with the carbon coated brown "tint" on the inside of the envelope. Does anyone know what the like; /archives//html/Amps/2007-12/msg00218.html (11,673 bytes)
56. Re: [Amps] Johnson Roller Inductor (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Mon, 31 Dec 2007 17:31:18 -0800; Hello Bob, What is the diameter, length, and number of turns, assuming Turns per inch, is constant? All the Best, 73, Pat Barthelow aa6eg@hotmail.com http://www.jamesburgdish.org Subscribe: http://ba; /archives//html/Amps/2007-12/msg00302.html (8,429 bytes)
57. Re: [Amps] A One Tube Radio (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Mon, 21 Jan 2008 12:17:19 -0800; Can you imagine the tinglies you would feel the first time, as the Principal Investigator, (Dr Zettl) and the grad student who built it. It was originally only a demodulator, until Dr Zettl, realized; /archives//html/Amps/2008-01/msg00135.html (10,849 bytes)
58. [Amps] Vacuum Variable Fatigue Failures (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 16 Feb 2008 11:19:33 -0800; Folks, I was looking closely at the mechanical marvel that is a Jennings Vacuum variable capacitor. I am wondering about whether the copper bellows arrangement that allows extension and contraction o; /archives//html/Amps/2008-02/msg00105.html (9,949 bytes)
59. [Amps] RF Parts Channel; Television Broadcast Equipment (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Mon, 18 Feb 2008 11:28:38 -0800; Folks: I am curious, if the coming Television transition to Digital, is releasing on the surplus market large numbers of various QRO RF components useful to Ham amp builders? I dont know the typical; /archives//html/Amps/2008-02/msg00120.html (7,189 bytes)
60. Re: [Amps] SB220 power supply (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sun, 2 Mar 2008 19:34:35 -0800; Re the SB 220, If you had a fine carbide drillbit, would it be possible to drill cleanly into the center region of the laminations of the transformer, without doing functional damage to the tranforme; /archives//html/Amps/2008-03/msg00026.html (11,064 bytes)

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