Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+MLA\-2500\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+MLA\-2500\s*$/: 40 ]

Total 40 documents matching your query.

21. Re: [Amps] MLA-2500 (score: 1): Author: Gudguyham@aol.com; Date: Fri, 25 Jan 2008 09:51:47 EST; The parasitic mod is the last thing that amp needs. You mean the Rich Measures parasitic suppressor kit will not help any?? **Biggest Grammy Award surprises of all time on AOL Music. (http://music.ao; /archives//html/Amps/2008-01/msg00173.html (6,868 bytes)
22. Re: [Amps] MLA-2500 (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 25 Jan 2008 10:29:00 -0500; The 8873/8874/8875 are very tame tubes when it comes to parasitics. Often the original resistors are still in spec unless the tubes have really been beat on. Carl KM1H You mean the Rich Measures para; /archives//html/Amps/2008-01/msg00174.html (7,717 bytes)
23. Re: [Amps] MLA-2500 (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 25 Jan 2008 10:31:42 -0500; Somethings definitely wrong then. Id start by closely inspecting the bandswitch and plate choke. BTW, the cover has to be in place when tuning, the steel that close to the coil has a huge effect. Car; /archives//html/Amps/2008-01/msg00175.html (8,723 bytes)
24. Re: [Amps] MLA-2500 (score: 1): Author: n4zed@comcast.net; Date: Fri, 25 Jan 2008 16:01:19 +0000; I suspect something is wrong also but I think it is in the design and not in any particular component failure. I've done the usual Google search and found the loading problem is common with this amp.; /archives//html/Amps/2008-01/msg00177.html (8,916 bytes)
25. Re: [Amps] MLA-2500 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Fri, 25 Jan 2008 11:43:40 -0500; Have you run the amp into a 50-ohm dummy load? It really doesn't make sense to me that the load cap would be near minimum (or maximum) capacitance into a 50-ohm load on all bands. As for gold sputter; /archives//html/Amps/2008-01/msg00178.html (9,647 bytes)
26. Re: [Amps] MLA-2500 (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 25 Jan 2008 09:01:57 -0800 (PST); My Dad had an MLA-2500. I recall that we had to add some fixed C-load for it to load properly on 160 m; even at that, it didn't do well below about 1.85 MHz or so. It was also not very efficient on 1; /archives//html/Amps/2008-01/msg00179.html (10,732 bytes)
27. Re: [Amps] MLA-2500 (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 25 Jan 2008 12:06:05 -0500; The issue that kills the tubes in that amp is over drive and overheating the grid, not "parasitics." Due to the transverse cooling the 8875 is rated for 300 watts plate dissipation (not 400 like the; /archives//html/Amps/2008-01/msg00180.html (11,469 bytes)
28. Re: [Amps] MLA-2500 (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Fri, 25 Jan 2008 12:25:14 -0500; Hi Ken, NO amplifier that I've encountered has EVER operated with the loading capacitor fully-meshed on ALL bands... Something is definitely amiss, that goes beyond just design, IMHO. Maximum capacit; /archives//html/Amps/2008-01/msg00181.html (8,236 bytes)
29. Re: [Amps] MLA-2500 (score: 1): Author: n4zed@comcast.net; Date: Fri, 25 Jan 2008 18:05:27 +0000; Thanks for the input Eddy, Joe, Kimberly, Pete and Jeremy. There "is" one band that the load is "only" about 80% meshed, I think it's the 10 meter band positions, I don't use that band much so I don'; /archives//html/Amps/2008-01/msg00182.html (8,963 bytes)
30. Re: [Amps] MLA-2500 (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Fri, 25 Jan 2008 13:09:57 -0500; I might as well add my opinions here too. <:-)) I had a MLA-2500 for several years. Actually I had quite a few of their amps while they were in business and although I didn't much care for the power; /archives//html/Amps/2008-01/msg00183.html (10,341 bytes)
31. Re: [Amps] MLA-2500 (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Fri, 25 Jan 2008 14:12:13 -0500; Hi Again Ken, "...Could the fact that I'm using a tuner and not a resonant antenna for each band cause this?" ** I think not, Ken -- the tuner transforms whatever impedance the wire / antenna might "; /archives//html/Amps/2008-01/msg00184.html (9,717 bytes)
32. Re: [Amps] MLA-2500 (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 25 Jan 2008 14:21:33 -0500; Lets get something straight right off. There is nothing wrong with the design that would cause your symtoms. Ive already outlined the few design problems. Gold sputtering is a myth that has been push; /archives//html/Amps/2008-01/msg00185.html (11,394 bytes)
33. Re: [Amps] MLA-2500 (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Fri, 25 Jan 2008 14:25:36 -0500; "...BTW, I have 2 MLA-2500's here and am a bit familiar with the design..." ** Hi Carl, A question: further to my earlier post, just how many sections does the variable loading capacitor in that spec; /archives//html/Amps/2008-01/msg00186.html (8,564 bytes)
34. Re: [Amps] MLA-2500 (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 25 Jan 2008 14:46:37 -0500; One, 800pf total. Its the same cap used in later Heath, Amp Supply, Ameritron and others. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2008-01/msg00187.html (9,066 bytes)
35. Re: [Amps] MLA-2500 (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 25 Jan 2008 11:49:09 -0800 (PST); I should have added to my post that, when tuned into a 50 ohm resistive load, I never saw the kind of behavior reported here with the load cap. It pretty much tuned by the book. Something isn't right; /archives//html/Amps/2008-01/msg00188.html (11,424 bytes)
36. Re: [Amps] MLA-2500 (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Fri, 25 Jan 2008 15:34:31 -0500; "...One, 800pf total. Its the same cap used in later Heath, Amp Supply, Ameritron and others..." ** There goes my theory about switching-in / out extra sections, as may be required, dependent upon th; /archives//html/Amps/2008-01/msg00189.html (8,730 bytes)
37. Re: [Amps] MLA-2500 (score: 1): Author: Gudguyham@aol.com; Date: Sat, 26 Jan 2008 09:30:23 EST; OOO EEE OOO LA LA TING TANG WALLA WALLA BING BANG. **Biggest Grammy Award surprises of all time on AOL Music. (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003000000025 48) ___; /archives//html/Amps/2008-01/msg00204.html (7,939 bytes)
38. [Amps] MLA-2500 (score: 1): Author: n4zed@comcast.net; Date: Fri, 22 Feb 2008 18:52:51 +0000; Update on the suspected loading problem with the Dentron MLA-2500 amp. As suggested by so many I loaded the amp up using a non-inductive dummy load. Using the dummy load the loading cap is loading as; /archives//html/Amps/2008-02/msg00155.html (6,651 bytes)
39. [Amps] MLA-2500 (score: 1): Author: "Roland AH6RR" <Toesonnose@hawaii.rr.com>; Date: Tue, 19 May 2009 10:25:20 -1000; I have a problem with my Dentron MLA-2500 I think it is the transformer. I have rebuilt the HV section with all new parts and it has 2250V until I put tubes in then it eats one of the 20ohm resistors; /archives//html/Amps/2009-05/msg00125.html (7,453 bytes)
40. Re: [Amps] MLA-2500 (score: 1): Author: Gudguyham@aol.com; Date: Tue, 19 May 2009 16:30:19 EDT; The 20 ohm step start resistor should be OUT OF THE CIRCUIT in less than about 1/2 second. If the resistor is burning up it is because the step start relay contact is not shorting out the resistor. I; /archives//html/Amps/2009-05/msg00126.html (7,480 bytes)

Current List: 21 - 40
Page: [1] [2]