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Total 104 documents matching your query.

61. Re: [Amps] GS35B Gassy, or Arcing? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 26 Feb 2015 14:30:23 -0600
I went back and read more of that page after I got more fully awake. Forget what I said about the 3800 volts for now. Sometimes, high voltage applied to a tube, BUT with more current behind it than y
/archives//html/Amps/2015-02/msg00156.html (10,306 bytes)

62. Re: [Amps] GS-35b fully-submersed oil cooling (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sun, 15 Mar 2015 18:42:26 -0500
Just a couple of comments/questions. I have some thoughts about the mechanical, non-RF side of this, but per your request, I will hold them for another time. Basically, I think oil cooling of some so
/archives//html/Amps/2015-03/msg00030.html (8,863 bytes)

63. Re: [Amps] Arctic Silver with and without silver (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 10 Apr 2015 12:08:08 -0500
Manfred, Thank you for this advice. I've been thinking about it ever since you sent it. Today I got to see for myself the difference in thermal greases. To make a long story short, replacing the orig
/archives//html/Amps/2015-04/msg00058.html (10,854 bytes)

64. Re: [Amps] Arctic Silver (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 11 Apr 2015 12:54:29 -0500
This is generally good advice. However, as Manfred nicely pointed out, "...applying an ultra thin, even layer is almost a guarantee for entrapping air bubbles. And that's definitely worse than a thic
/archives//html/Amps/2015-04/msg00064.html (7,469 bytes)

65. Re: [Amps] fully-submersed oil cooling - (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sun, 12 Apr 2015 02:27:07 -0500
The anode air cooler could be removed. In its place, a small copper (or aluminum) liquid cooling block --considerably smaller than the original air cooler-- could be made in a machine shop in a coupl
/archives//html/Amps/2015-04/msg00070.html (8,288 bytes)

66. Re: [Amps] Tetrode software (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 1 May 2015 18:08:06 -0500
I seem to recall that for programs of this sort to run in newer versions of Windows, we have to download a file something like VBRUNxxx to the correct directory. It may be available on microsoft.com
/archives//html/Amps/2015-05/msg00007.html (7,266 bytes)

67. Re: [Amps] Time for New Power Meter (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 4 May 2015 00:29:49 -0500
I can only think of a couple of situations where an accurate wattmeter matters. Some amateurs seem to think that a given increase in their wattmeter deflection --or a corresponding decrease in their
/archives//html/Amps/2015-05/msg00042.html (9,595 bytes)

68. Re: [Amps] Time for New Power Meter (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 4 May 2015 02:21:18 -0500
That's one of the situations I had in mind. For general hamming, wattmeter accuracy isn't usually important. 73, Mike www.w0btu.com _______________________________________________ Amps mailing list A
/archives//html/Amps/2015-05/msg00048.html (10,551 bytes)

69. Re: [Amps] 12V IM3 (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 22 May 2015 13:23:14 -0500
Well stated. However, at the risk of sounding pessimistic, I think that's wishful thinking. What bugs me is that most (if not all) SS amps that are overdriven generate considerably more IMD than most
/archives//html/Amps/2015-05/msg00157.html (7,171 bytes)

70. Re: [Amps] 12V IM3 (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 22 May 2015 15:39:06 -0500
Thanks, Joe. Just how does one get "the ARRL"'s attention? I know a few things for sure: I was told by a respectable ham who works for the ARRL that the BOD (Board of Directors and some others there
/archives//html/Amps/2015-05/msg00160.html (8,554 bytes)

71. Re: [Amps] Super Cathode Driven 4CX250B (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 10 Jul 2015 19:10:50 -0500
Hi Bill, Thanks for sharing this. I just learned something. I wasn't aware that the super-cathode drive might be a good idea on a tetrode. From reading Tom's stuff in the past, I got the impression t
/archives//html/Amps/2015-07/msg00029.html (7,620 bytes)

72. Re: [Amps] Triode grounded grid amp strange failure (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 14 Jul 2015 16:11:52 -0500
I would check the plate current meter and the connections to it. 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c
/archives//html/Amps/2015-07/msg00043.html (7,362 bytes)

73. Re: [Amps] Blower noise (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 11 Aug 2015 16:45:48 -0500
I have done exactly that. That's the best blower noise reduction there is. One place I lived, the front panel was flush with the radio room, and the rest of it sat on a wall shelf in the laundry room
/archives//html/Amps/2015-08/msg00028.html (7,920 bytes)

74. Re: [Amps] Blower noise (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 13 Aug 2015 14:26:20 -0500
Slowing a blower can significantly reduce the back pressure. Be careful that you have enough pressure to get the required airflow for the rated anode dissipation. 73, Mike www.w0btu.com _____________
/archives//html/Amps/2015-08/msg00041.html (8,182 bytes)

75. Re: [Amps] Regulated filament current (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 4 Sep 2015 13:01:33 -0500
I'm surprised that no one has mentioned thermistor inrush current limiters as an alternative solution: https://www.rfparts.com/currentlimiters.html They're wired in series with the filament (and HV)
/archives//html/Amps/2015-09/msg00012.html (8,044 bytes)

76. Re: [Amps] N panel connector screws (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 3 Oct 2015 17:26:38 -0500
4-40 (#4, 40 threads per inch). 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-10/msg00005.html (7,109 bytes)

77. Re: [Amps] TX3X (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 9 Oct 2015 15:00:51 -0500
How about 160 meters? If so, was it CW or digital? 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2015-10/msg00017.html (6,925 bytes)

78. Re: [Amps] Henry bleeder resistor source. (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sat, 10 Oct 2015 14:04:15 -0500
Those are Ohmite vitreous enamel resistors. Historically, they have been top quality, almost mil-spec. I had a 150K 100W Dale HL-100-06Z (made in Mexico) bleeder in my dual-833C amp's HV PS. It opene
/archives//html/Amps/2015-10/msg00038.html (9,022 bytes)

79. Re: [Amps] Cleaning amp bandswitch (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 10 Nov 2015 13:30:44 -0600
DeoxIT D5 from Caig Laboratories is vastly superior to alcohol. Follow it up with S-Shield from the same company, which gradually dries. It's not cheap, but I'll *never* go back to any other contact
/archives//html/Amps/2015-11/msg00053.html (7,579 bytes)

80. Re: [Amps] Cleaning amp bandswitch (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 12 Nov 2015 10:21:45 -0600
I tried Tarn-X, which contains thiourea, in the early 1990's. Although it indeed quickly shined the silver, it seemed to leave an invisible residue that eventually deteriorated the silver. I tried it
/archives//html/Amps/2015-11/msg00070.html (8,293 bytes)

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