Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[AMPS\]\s+AL1500\s+\?\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[AMPS\]\s+AL1500\s+\?\s*$/: 81 ]

Total 81 documents matching your query.

21. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 4 Dec 2001 15:54:07 -0000; According to info I received from W8JI, N1JV, N2JV and W0ID two years ago when I asked the same question, 8877s manufactured between late 1985 and 1989 are suspect. There was a design change in Augus; /archives//html/Amps/2001-12/msg00074.html (8,576 bytes)
22. [AMPS] AL1500 (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 4 Dec 2001 07:48:43 -0800; [Steve Katz] Not surprised there are marketing variants of data sheets from Eimac, just like from anyone else. AL1500 runs ~65% efficiency at full power output, resulting in only about 1200W dissipa; /archives//html/Amps/2001-12/msg00075.html (10,783 bytes)
23. [AMPS] AL1500 (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 4 Dec 2001 07:49:43 -0800; Thanks for the info, Peter. I don't think I have any that are "newer" than 1986, but I'll check. Damn, I'm getting old.... WB2WIK/6 -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps; /archives//html/Amps/2001-12/msg00076.html (8,717 bytes)
24. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 4 Dec 2001 10:59:04 -0500; Absolutely. And, there may have been more than one "bad run" on these tubes. I do know that in 1980 it was a critical issue for Eimac. As I indicated in my previous message, I went through ~ 10 new; /archives//html/Amps/2001-12/msg00077.html (8,908 bytes)
25. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 4 Dec 2001 16:03:44 -0000; Sounds like the question could usefully be rephrased to ' Are there known 'good' production runs of 8877s?' 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesti; /archives//html/Amps/2001-12/msg00078.html (8,527 bytes)
26. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Tue, 4 Dec 2001 10:36:05 -0800; // WØID said that the 8877 manufacturing defect was produced for c. 14-months. // The last I heard, Ameritron/MFJ's engineer still claims that Eimac is at fault for 8877 failures in the AL-15; /archives//html/Amps/2001-12/msg00083.html (8,701 bytes)
27. [AMPS] AL1500 (score: 1): Author: kc5vdj@yahoo.com (Jim Bryant); Date: Wed, 05 Dec 2001 00:14:23 -0600; I'm sure using a sledge-hammer to drive paneling nails works, but honestly, it's better to do the job right to begin with. If a parasitic can be determined and suppressed, without the need for brute; /archives//html/Amps/2001-12/msg00088.html (9,275 bytes)
28. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 07:21:25 -0000; 14-months. The copy I have of W0ID's email to N2JV suggests the fault appeared with the design changes of 8/86, and the second 'fix' saw initial deliveries in 8/88, while completion of field upgrade; /archives//html/Amps/2001-12/msg00089.html (9,374 bytes)
29. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 04:32:37 -0800; // Chortle. As I understand the phenomenon, stopping a parasite with a grid-I auto-shutdown is probably not as easy as it first looks. An 8877's cathode is capable of producing over 50A of peak elec; /archives//html/Amps/2001-12/msg00093.html (10,776 bytes)
30. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 04:32:40 -0800; // Tnx, Peter. There may be yet another manufacturing defect since, as I recall, Mr. Rauch stated that recent failures in the AL-1500 were still Eimac's fault. cheers - R. L. Measures, 805.386.3734,; /archives//html/Amps/2001-12/msg00094.html (9,655 bytes)
31. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 12:41:02 +0000; We're still waiting for a specific reference to the circuit that has this design flaw. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.; /archives//html/Amps/2001-12/msg00096.html (9,131 bytes)
32. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 5 Dec 2001 07:39:45 -0500; Ohh, this parasitic nonsense again? 8877's have had poor service history while they were at Salt Lake. While there were periods of time in the 80's when you couldn't get a tube that lasted over a few; /archives//html/Amps/2001-12/msg00097.html (9,917 bytes)
33. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 12:45:26 -0000; Quite possibly. It's not an easy thing to trace, is it? The best bet is if you ship the amplifier, complete with tube, having done a 'burn in' run for say 100 hours. The cost of such a burn in (provi; /archives//html/Amps/2001-12/msg00098.html (9,056 bytes)
34. [AMPS] AL1500 (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 5 Dec 2001 12:55:31 -0000; Over and above semiconductors? Fine for many parts, but there's been plenty of semiconductor batches where poor manufacturing factors such as step coverage in metal and bad injection molding, poor de; /archives//html/Amps/2001-12/msg00099.html (9,160 bytes)
35. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:19:08 -0800; There is no one circuit that has this flaw. There are several. I have never seen an 8877 grid-I-trip ckt that used a >2a transistor. If you know of one, please enlighten. cheers, Ian - R. L. Measure; /archives//html/Amps/2001-12/msg00101.html (9,161 bytes)
36. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:19:10 -0800; // Removing the 8877's anode cooler is not all that difficult, and it's not nearly as stinky as doing a human autopsy. Spotting the cause of death takes maybe 20-seconds when my 30x magnifier isn't; /archives//html/Amps/2001-12/msg00102.html (9,569 bytes)
37. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:39:55 -0800; // see such "nonsence" at: http://www.vcnet.com/measures/bandsw.html // The Red Herring // So why did you stonewall me six times during the Grate Parasitics Debate when I asked you: is there a VHF p; /archives//html/Amps/2001-12/msg00103.html (11,301 bytes)
38. [AMPS] AL1500 (score: 1): Author: Wt8r@aol.com (Wt8r@aol.com); Date: Wed, 5 Dec 2001 09:07:14 EST; This is hardly a revelation even to a neophyte like me and it isn't tough to believe. just for a To what might you attribute a big bang when tuning (at resonance) an 8877 linear into a 2500 Watt Bird; /archives//html/Amps/2001-12/msg00105.html (9,479 bytes)
39. [AMPS] AL1500 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 5 Dec 2001 09:45:21 -0500; I'm speaking from the standpoint of service history of components. When you get a good semiconductor, which is nearly 100% of the time, you can expect it to last dozens of years. You can turn it off; /archives//html/Amps/2001-12/msg00107.html (9,940 bytes)
40. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 13:27:13 +0000; I know of no grid current monitoring circuits that behave as you describe - that's my point. This ball has been in your court for some months, Rich. If there are "several" such circuits, you'll have; /archives//html/Amps/2001-12/msg00110.html (9,238 bytes)

Current List: 21 - 40
Page: [1] [2] [3] [4] [5]