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321. Re: [Amps] HV Turn On Delay (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 27 Sep 2006 04:41:51 -0400; Mike, Whenever cathode current demand exceeds emission capability for the cathode operating temperature or surface area, the cathode can be chemically poisoned. This is why indirectly-heated tubes o; /archives//html/Amps/2006-09/msg00319.html (9,378 bytes)
322. Re: [Amps] HV Turn On Delay (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 27 Sep 2006 11:34:17 -0400; I've never heard of that problem. Thoriated tungsten tubes are not subject to these problems Vic. They can tolerate much higher anode voltages and be operated with full emission saturation without d; /archives//html/Amps/2006-09/msg00324.html (8,802 bytes)
323. Re: [Amps] Bad Tubes (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 29 Sep 2006 15:43:23 -0400; It isn't just lately Mike. About one fourth to half of the sample tubes I obtained years ago were bad out of the box and they had no signs of being mishandled. When I considered they also might not; /archives//html/Amps/2006-09/msg00367.html (7,363 bytes)
324. Re: [Amps] shipping damage (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 29 Sep 2006 18:56:31 -0400; One of the major problems is most people don't have any idea how to pack something to make it survive shipping. They think it's all a matter of bubble wrap or newspapers. How would you handle that?; /archives//html/Amps/2006-09/msg00369.html (6,844 bytes)
325. Re: [Amps] 3cpx800a7 or similar tube storage (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 29 Sep 2006 22:46:19 -0400; After reading the info here in AMPS about Conditioning Tubes, I have a few questions: Upon receipt of a set NOS or Medical pulls , how should the average Ham with limited test equipment test the tube; /archives//html/Amps/2006-09/msg00373.html (8,439 bytes)
326. Re: [Amps] New Chinese linear Amplifier (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 30 Sep 2006 00:05:52 -0400; Hsu, the picture has no plate connection wires. Let's not imagine it does. There are a few other parts missing also. It is a very nice copy of an American linear. Not many people are so comfortable; /archives//html/Amps/2006-09/msg00377.html (8,450 bytes)
327. Re: [Amps] Boycott New Chinese linear Amplifier (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 30 Sep 2006 10:19:37 -0400; The real point I was trying to make is there could be many improvements made in that basic design if the Chinese actually put some creative engineering into the product. A better product at the same; /archives//html/Amps/2006-09/msg00382.html (10,055 bytes)
328. Re: [Amps] Boycott New Chinese linear Amplifier (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 30 Sep 2006 20:48:57 -0400; Please tell us how it is better. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00386.html (8,743 bytes)
329. Re: [Amps] Boycott New Chinese linear Amplifier (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 3 Oct 2006 21:21:20 -0400; Hsu, Respectfully you are missing my point. When people copy and repeat something else it is almost never really improved. It is simply the same path and no major change. Major change or improvement; /archives//html/Amps/2006-10/msg00008.html (9,436 bytes)
330. Re: [Amps] Boycott New Chinese linear Amplifier (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Oct 2006 19:04:32 -0400; If you look up that DNS under "who is" at www.DNSstuff.com this is the ISP where the posting originated: Generated by Location: United States [City: Rancho Cucamonga, California] [Caching always on f; /archives//html/Amps/2006-10/msg00032.html (8,368 bytes)
331. Re: [Amps] Glued meters ! (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Oct 2006 19:18:47 -0400; If you read later posts, Hsu then said it **wasn't glued** in the AL-811. Quite frankly I can't remember if any units ever shipped with the meters just glued. I know an initial prototype S/N 0001 I; /archives//html/Amps/2006-10/msg00034.html (8,104 bytes)
332. Re: [Amps] Bad tubes from Ebay (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 4 Oct 2006 23:44:48 -0400; How can a gassy tube cause a flashover?> You might read this: http://www.allaboutcircuits.com/vol_3/chpt_13/9.html You would expect the electrons to collide with gas molecules within the tube, hence; /archives//html/Amps/2006-10/msg00039.html (7,263 bytes)
333. Re: [Amps] Henry Tempo 6N2 (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 9 Oct 2006 06:29:49 -0400; Can you post a schematic? Is this voltage from the main transformer? Are you sure your meter is correct? How are the other low voltages like filament? Are they OK? 73 Tom ___________________________; /archives//html/Amps/2006-10/msg00068.html (6,877 bytes)
334. Re: [Amps] Filament Voltage Parameters on Russian Triodes. (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 9 Oct 2006 11:50:21 -0400; these tubes?? Bob, Commercial stations that never cycle the tube filaments and run them conservatively 24 hours a day have to worry about maximizing life. They might have 24*7*52 = 8736 hours a year; /archives//html/Amps/2006-10/msg00072.html (7,623 bytes)
335. Re: [Amps] 8877 hipot (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 11 Oct 2006 12:21:40 -0400; Jim, I assume you have a dc highpot. Why don't you run the filament (with airflow) for a few hours and see how the tube tests? The good 8877's I test hold off about 12-15kV from anode to grid before; /archives//html/Amps/2006-10/msg00079.html (7,022 bytes)
336. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 12 Oct 2006 12:13:55 -0400; Ray Heaton, the Alpha tech specialist at one time was vehemently opposed to the after-market program. I suppose he knew about the inability of the small doorknobs to support the circulating I've hear; /archives//html/Amps/2006-10/msg00104.html (9,260 bytes)
337. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 14 Oct 2006 04:50:02 -0400; Your scenario is really the only one anyone would use Doug. The real reason is to run more than the 2.5kW output the single tube amp would do. A single 8877 run full tilt is cleaner than any amateur; /archives//html/Amps/2006-10/msg00112.html (9,057 bytes)
338. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 14 Oct 2006 21:26:56 -0400; How do you figure that? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-10/msg00123.html (9,201 bytes)
339. Re: [Amps] New FCC Amplifier Rule (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 14 Oct 2006 05:01:11 -0400; The 11 meter band was used for commercial 2-way and radio control also, but the "I can do anything I want" CB mentality ruined that also. The FCC's original intention was good. CB was intended to be; /archives//html/Amps/2006-10/msg00130.html (8,777 bytes)
340. Re: [Amps] New FCC Amplifier Rule (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 15 Oct 2006 04:42:16 -0400; There never was a restriction or agreement on commercial or business two-way below 30MHz requiring Morse that I am aware of. Only amateur. _______________________________________________ Amps mailin; /archives//html/Amps/2006-10/msg00132.html (7,986 bytes)

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