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Total 36 documents matching your query.

1. [Amps] al80a (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 1 Aug 2002 07:03:33 -0700; //When you power "on" the amp but it remains in standby (unkeyed), it shouldn't draw any plate current and the anode should be dark gray. If it's drawing current, either it's keyed or its cutoff bia; /archives//html/Amps/2002-08/msg00003.html (7,935 bytes)
2. [Amps] al80a (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 1 Aug 2002 07:08:23 -0700; /archives//html/Amps/2002-08/msg00004.html (8,830 bytes)
3. [Amps] al80a (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 01 Aug 2002 07:45:34 -0700; I had these symptoms in a friend's AL80B. The problem was a grid-filament short which showed up only when the tube was hot. Try a new tube. Vic K2VCO Fresno CA; /archives//html/Amps/2002-08/msg00006.html (7,795 bytes)
4. [Amps] al80a (score: 1): Author: carlseye@tampabay.rr.com (carl seyersdahl); Date: Thu, 1 Aug 2002 18:35:40 -0400; In my FWIW dept. I looked over the entire amp and didn't find anything of conncern. I did find a burned resistor which turned out to be in the external 12vdc line. , but no burned bandswitch contacts; /archives//html/Amps/2002-08/msg00012.html (8,283 bytes)
5. [Amps] al80a (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Thu, 1 Aug 2002 16:45:14 -0700; Or there's a grid to filament short, while hot or cold. With an elevated B- rail and grid metering between B- and ground, plate current will flow through the grid meter shunt and can't be cut-off. T; /archives//html/Amps/2002-08/msg00013.html (8,471 bytes)
6. [Amps] al80a (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 2 Aug 2002 06:47:42 +0100; the A genuine question on my part, not meant to appear critical of Carl in any way. You described the tube as 'laid' on the bench - if this is on its side rather than standing up, will the filament s; /archives//html/Amps/2002-08/msg00014.html (9,021 bytes)
7. [Amps] al80a (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 2 Aug 2002 09:08:54 +0100; Take care about the glitch diode. In an SB-1000 (same animal) that someone else had "pre-repaired", I had weird meter readings on 160m until the glitch diode was replaced with a 1N5408. It turned out; /archives//html/Amps/2002-08/msg00015.html (10,981 bytes)
8. [Amps] al80a (score: 1): Author: carlseye@tampabay.rr.com (carl seyersdahl); Date: Fri, 2 Aug 2002 07:04:10 -0400; Very good question , Steve !! I'll take a look at that situation a little later today.. I'll run the same test with the tube "standing up" as in the correct position !!! carl / kz5ca -- Original Mess; /archives//html/Amps/2002-08/msg00016.html (10,075 bytes)
9. [Amps] al80a (score: 1): Author: carlseye@tampabay.rr.com (carl seyersdahl); Date: Fri, 2 Aug 2002 08:20:24 -0400; upright, vertical, as it would be in the amp, position.!! the result was the same. 20-25 ohms as soon as the filament warmed up. !! carl / kz5ca -- Original Message -- From: "Steve Thompson" <g8gsq@; /archives//html/Amps/2002-08/msg00017.html (10,066 bytes)
10. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 05:25:18 -0700; Another way to find a tube with a bent filament is with a high-potential tester. A grid-filament breakdown of under 5kV indicates a bent filament that may short when the filament is hot. C. 8kV is n; /archives//html/Amps/2002-08/msg00018.html (9,067 bytes)
11. [Amps] al80a (score: 1): Author: vk6apk@eon.net.au (Alek Petkovic); Date: Fri, 02 Aug 2002 20:25:50 +0800; Give it a good thump while it's hot. You've got nothing to lose. 73, Alek VK6APK To: <amps@contesting.com>; /archives//html/Amps/2002-08/msg00019.html (10,787 bytes)
12. [Amps] al80a (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 2 Aug 2002 14:18:20 +0100; Sorry, that's K6XX, at http://www.k6xx.com/ikanrite.html -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB); /archives//html/Amps/2002-08/msg00020.html (8,274 bytes)
13. [Amps] al80a (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 2 Aug 2002 07:10:39 -0700; /archives//html/Amps/2002-08/msg00021.html (8,683 bytes)
14. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:13 -0700; I have observed that position makes virtually no difference in grid-filament withstanding potential. // I performed a hot filament sag test with a 3-500Z in horizontal position. The change in filamen; /archives//html/Amps/2002-08/msg00024.html (10,733 bytes)
15. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:16 -0700; Ian -- How much RF potential did you measure across the 0.01uF HV-bypass without a glitch resistor? Some radios R/T switch in 5mS. What is the measured make-speed of the stock relay with this circui; /archives//html/Amps/2002-08/msg00025.html (11,712 bytes)
16. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:28 -0700; Bingo. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00027.html (8,874 bytes)
17. [Amps] al80a (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 2 Aug 2002 23:39:32 +0100; I didn't even try. If you think about it, such a measurement is well-nigh impossible in that location, which is very hard to get to and bathed in an intense RF field. You've also mentioned several ti; /archives//html/Amps/2002-08/msg00030.html (12,196 bytes)
18. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 19:15:01 -0700; ** I tried operating one on its side. The sag rate @ 5V on the filament was slower than molassas in January. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00031.html (7,956 bytes)
19. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 19:58:55 -0700; If the bypass cap has a low XC at the frequency of operation, there should be a low V across the capacitor. The 1nF bypass cap has 88.4-ohms of reactance at 1.8MHz. There is roughly 1A of RF current; /archives//html/Amps/2002-08/msg00032.html (12,820 bytes)
20. [Amps] al80a (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 3 Aug 2002 11:02:33 -0400; 99% of that stuff is just needless folklore originated by people who sell kits. Some people just can't face the fact that tubes fail, and so they "invent" odd reasons to explain a common event. For; /archives//html/Amps/2002-08/msg00034.html (10,008 bytes)

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