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References: [ +from:km1h@jeremy.qozzy.com: 394 ]

Total 394 documents matching your query.

41. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 29 Oct 2014 21:20:06 -0400
And in North America the emphasis has been on both types as both have their uses in broadcasting and in communications where the latter mostly use grid driven with low power driver stages and large s
/archives//html/Amps/2014-10/msg00245.html (10,181 bytes)

42. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 30 Oct 2014 10:42:54 -0400
The usual rule of thumb is to run the AM carrier at 24% of the tubes anode dissipation. Figure on an average of 50% efficiency at full DSB AM PEP. Tune up as you normally would for 1500W and keep the
/archives//html/Amps/2014-10/msg00252.html (9,827 bytes)

43. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 30 Oct 2014 10:53:57 -0400
I think I should mention that 375W is for a 100% modulated sine wave. Since speech is asymmetric and various compression/clipping methods allow much higher positive peaks while clipping the negative
/archives//html/Amps/2014-10/msg00253.html (12,314 bytes)

44. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 30 Oct 2014 11:03:03 -0400
"The usual rule of thumb is to run the AM carrier at 24% of the tubes anode dissipation." That was supposed to be 25%. Carl KM1H _______________________________________________ Amps mailing list Amps
/archives//html/Amps/2014-10/msg00254.html (7,741 bytes)

45. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 31 Oct 2014 08:18:21 -0400
True if you tune up at 1500W. But if the amp is capable of being tuned to 2000W+, as are the majority of the "big" amps being sold, you can drive it with 120% positive peaks which many do with modifi
/archives//html/Amps/2014-10/msg00272.html (18,770 bytes)

46. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 31 Oct 2014 08:19:04 -0400
The problem is that "desired communications" is not defined! REPLY: That is intentional. Government entities like to have a law or rule on the books that they can use only when they need or want to
/archives//html/Amps/2014-10/msg00273.html (11,061 bytes)

47. Re: [Amps] AL1200 on AM - max carrier? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 31 Oct 2014 23:07:56 -0400
My last post on this subject explained how to tune up for AM when using an SSB radio in the AM mode. ** Users should first read the procedure in the manual and there are several explanations on AM or
/archives//html/Amps/2014-10/msg00286.html (25,187 bytes)

48. Re: [Amps] 572B - News? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 7 Nov 2014 11:51:52 -0500
RF Parts will be taking new 572B orders in Jan 2015, Id rather wait than hack up a perfectly good amp for an inferior tube. http://www.rfparts.com/tubes/tubes-572b.html Carl KM1H Hi, Gustavo! Thanks
/archives//html/Amps/2014-11/msg00005.html (10,464 bytes)

49. Re: [Amps] 572B - News? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 7 Nov 2014 13:03:27 -0500
The Svetlana works OK but has a smaller anode and less dissipation. They havent been made in several years now. Carl KM1H Marcelo..... Try to find some 572-B made by Svetlana.......they are much bett
/archives//html/Amps/2014-11/msg00009.html (10,590 bytes)

50. Re: [Amps] 572B - News? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 7 Nov 2014 15:10:57 -0500
The FL-2100's with 572B's did not have sufficient bias for Svetlana and even some Chinese tubes, the fix was easy. OTOH those amps have a wacky neutralizaion circuit that is far from stable on all ba
/archives//html/Amps/2014-11/msg00012.html (12,735 bytes)

51. Re: [Amps] [Bulk] Re: 572B - News? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 7 Nov 2014 16:17:41 -0500
I disagree about the Svetlana 572B and repeated underated problems led to its being discontinued. Perhaps they rated it at some imaginary IVS 160W instead of ICAS commercial use. All used a ceramic b
/archives//html/Amps/2014-11/msg00015.html (15,522 bytes)

52. Re: [Amps] 8875 in Dentron MLA 2500B (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 9 Nov 2014 09:41:57 -0500
A single 3CX800 is all the MLA-2500 power transformer can handle and you will increase available dissipation from 600 to 800W. Cooling changes are a little involved but you have a lot of dissipation
/archives//html/Amps/2014-11/msg00022.html (8,457 bytes)

53. Re: [Amps] AL80B power meter not working (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 13 Nov 2014 08:34:01 -0500
The 1N914 is not a Schottky, just your basic silicon signal diode, sort of the 1N4148 grandfather. If you want Schottky try the 1N5711. Carl KM1H Well, as something easy to try, I replaced the two de
/archives//html/Amps/2014-11/msg00028.html (10,119 bytes)

54. Re: [Amps] Hunter 2000C issue (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 16 Nov 2014 09:23:14 -0500
Yep, that amp was built in the 60's and its a judge of its quality that the caps have lasted that long. I have a 2000C here waiting for a rebuild. That R9 is a surge resistor and doing its job and it
/archives//html/Amps/2014-11/msg00032.html (8,632 bytes)

55. Re: [Amps] Alpha 76A (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Tue, 25 Nov 2014 20:57:19 -0500
It uses the common Centralab JV-9000 (now Electroswitch E-4 series) series switch Paul, all are 20 degree. Carl KM1H Thanks to all who responded. The detent spacing is 20 degrees. Paul, W9AC ________
/archives//html/Amps/2014-11/msg00052.html (8,287 bytes)

56. Re: [Amps] Holding a vacuum (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 27 Nov 2014 15:24:55 -0500
I'm curious as to your experiences with tubes in long term storage. The question is, which type holds a vacuum better - glass or ceramic, or is there no difference? My own limited experience says ce
/archives//html/Amps/2014-11/msg00059.html (9,021 bytes)

57. Re: [Amps] Holding a vacuum (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 28 Nov 2014 11:39:01 -0500
A small fan is fine. Carl KM1H Earlier this week I emailed Eimac with the question about shelf life of the new 4CX1500B tubes that I have. I also asked about the serial number on the tubes and how to
/archives//html/Amps/2014-11/msg00062.html (11,015 bytes)

58. Re: [Amps] AL80-B fuse F101 blown;step-startnot working? (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Fri, 28 Nov 2014 15:49:56 -0500
The first thing Id check is to see if the relay contacts are welded, Ameritron uses the wrong contact alloy for high current use. Also check that the step start circuit is wired per the manual as Ame
/archives//html/Amps/2014-11/msg00067.html (9,877 bytes)

59. Re: [Amps] Old Moto RF Decks (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sun, 30 Nov 2014 19:39:54 -0500
So then what do they do with the heasink which is almost the full amp section including chassis? Ive been staring at a VHF 2 holer for a couple of decades that was tossed into the trash bin at a hamf
/archives//html/Amps/2014-11/msg00080.html (8,894 bytes)

60. Re: [Amps] Holding a vacuum (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Mon, 1 Dec 2014 15:24:19 -0500
It all depends upon what you mean by gas and what is its density. Altho the air we breathe is a gas it is not called that in tube technology and to avoid the misinterpertation it is referred to as "g
/archives//html/Amps/2014-12/msg00006.html (12,981 bytes)

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