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References: [ +from:steve@nr4m.com: 87 ]

Total 87 documents matching your query.

61. Re: [Amps] W8ZR Autotune Amplifier Progress Report (score: 1)
Author: "Steve, NR4M" <steve@nr4m.com>
Date: Fri, 25 Dec 2020 16:17:01 -0500
Good question. I was wondering the same thing. Those switches have a serious detent. Someone who has the resources could partially fill them in with a machine able epoxy. 73 de Steve NR4M Sent from m
/archives//html/Amps/2020-12/msg00062.html (13,404 bytes)

62. [Amps] Hi-pot testing (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Fri, 12 Feb 2021 17:39:46 -0500
Hello all, Several months ago, I had a problem with a 40 year old HB amp for 160.  Just sitting there, it started making an arcing noise (sort of) and showed plate current jumping around. Now, I'm fi
/archives//html/Amps/2021-02/msg00005.html (7,011 bytes)

63. [Amps] WTB fil transformer for 8877 (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 2 Dec 2021 17:21:38 -0500
Hello all, Looking for a filament transformer for an 8877/3cx1500.  Eimac specs say 5 volts @ 10.5 amps. Please respond directly to steve@nr4m.com Thanks. Steve, NR4M ________________________________
/archives//html/Amps/2021-12/msg00021.html (6,554 bytes)

64. [Amps] Switch for Alpha 87A (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 18 Aug 2022 14:39:39 -0400
Hello all, I just recently purchased an Alpha 87A, with a flakey 'stand by/operate' switch.  I understand this is not an uncommon problem.  Does anyone know a source for these? Please don't say Alpha
/archives//html/Amps/2022-08/msg00018.html (7,096 bytes)

65. Re: [Amps] Powering NOS 8874's ? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Thu, 18 Aug 2022 14:46:47 -0400
I assume others have answered you already. If it were me, I would maybe leave the plate caps off and run it for a long day, with just the filaments and blower.  Just no plate voltage.  (but, Plate vo
/archives//html/Amps/2022-08/msg00019.html (8,556 bytes)

66. [Amps] transformer identification (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 14 Nov 2022 16:39:10 -0500
Hello all, I found a transformer which I had in storage. Quite sure its a plate transformer, but thats all I know. Its marked TRIAD 75071. Its about 6 in. cubed. Does anyone know what this transforme
/archives//html/Amps/2022-11/msg00017.html (6,490 bytes)

67. Re: [Amps] transformer identification (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Mon, 14 Nov 2022 17:43:21 -0500
Hi Joe, I went there and found an archive of old catalogs starting from the early '50's.  Unfortunately, the searching of any one of them turned out to be almost impossible. You're supposed to click
/archives//html/Amps/2022-11/msg00019.html (8,801 bytes)

68. Re: [Amps] transformer identification (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 15 Nov 2022 08:21:36 -0500
Byron, Thanks very much for the idea.  I had no idea 'bunker of doom' existed. I think I've run into a dead end on the Triad transformer, but will keep looking. Steve NR4M On 11/14/2022 8:14 PM, Byro
/archives//html/Amps/2022-11/msg00021.html (9,144 bytes)

69. Re: [Amps] transformer identification (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 15 Nov 2022 19:13:15 -0500
Thanks for your input, Rob. FYI, the picture was not taken with an audience in mind.  I just took it so I could remember the part number. I think the AC input terminals were all mounted on a fibergla
/archives//html/Amps/2022-11/msg00024.html (9,886 bytes)

70. [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 13 Dec 2022 17:36:44 -0500
Hello all, (First part is background, so you know a more 'overall' of what I'm doing.) I've been intending to finish a long-ago-started mono band amp for 10 meters, and I think I regained the enthusi
/archives//html/Amps/2022-12/msg00044.html (9,130 bytes)

71. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 13 Dec 2022 18:23:09 -0500
Hello Jim, 4kv.  It's about 4.2 kv, no load. On another point, for the group, 'somewhere, sometime', in more than one place on the web, I've seen where people recommended using 2.0 as the 'K' factor,
/archives//html/Amps/2022-12/msg00046.html (10,785 bytes)

72. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 13 Dec 2022 21:07:04 -0500
Hi Vic, The GM3SEK calculator gives you a value, but the stray plate-to-ground capacitance is an important variable and it is hard to determine. I measured it (with an AADE LC meter) with the tuning
/archives//html/Amps/2022-12/msg00052.html (19,896 bytes)

73. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 13 Dec 2022 21:38:04 -0500
Thank Jim, One of my big questions was if I could use GM3SEK's spreadsheet calculator.  I'm not too far off from what you came up with and that was because we used different numbers here and there. I
/archives//html/Amps/2022-12/msg00054.html (13,384 bytes)

74. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Sat, 17 Dec 2022 17:15:35 -0500
Jim, Thanks a bunch for your input. I was close. I had used .65 for the current and a "K" factor of 2.0 as I'm 99% CW.  It's been DECADES since I was above 28.1 MHz.  I could have easily chosen 1.8. 
/archives//html/Amps/2022-12/msg00075.html (14,439 bytes)

75. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Sat, 17 Dec 2022 17:18:43 -0500
...And, I was planning on using about a 1 7/8 - 2 inch dia for the coil. Steve I cycled all of the unknown tubes thru this amp.? They all were similar, taking 22 to 27 watts of drive for the same 150
/archives//html/Amps/2022-12/msg00076.html (12,400 bytes)

76. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Sun, 18 Dec 2022 17:10:38 -0500
Jeff, and others, Not a problem.   I already have an idea to make the connections of the coil, snug, but still moveable.   I plan on making my 'best guess' and then have enough slack in the mounting
/archives//html/Amps/2022-12/msg00080.html (16,733 bytes)

77. Re: [Amps] L-PI amp network (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Tue, 20 Dec 2022 17:25:13 -0500
Hello Jim, Wow! What a treasure trove of good info! Thank you for sharing it with me. I appreciate the detail in which you EXPLAIN things.  Although answers may be enough, I really want to know 'why'
/archives//html/Amps/2022-12/msg00090.html (20,416 bytes)

78. [Amps] What to do about 'Neutral' in HB amp? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Wed, 28 Dec 2022 09:22:18 -0500
Hello all, I'm building a HB amp for 10 meters and am looking for the best solution to a problem I've wondered about for DECADES. Other than using a 4 conductor plug/outlet (2-120 volt, one neutral a
/archives//html/Amps/2022-12/msg00122.html (10,506 bytes)

79. Re: [Amps] What to do about 'Neutral' in HB amp? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Wed, 28 Dec 2022 12:50:38 -0500
Hello all, Thanks for the input, so far. I made a boo-boo on the transformer.  it's 0, 220, 230 and 240 volt on four terminals. Steve, NR4M I'm building a HB amp for 10 meters and am looking for the
/archives//html/Amps/2022-12/msg00129.html (11,562 bytes)

80. Re: [Amps] What to do about 'Neutral' in HB amp? (score: 1)
Author: Steve Bookout <steve@nr4m.com>
Date: Fri, 30 Dec 2022 18:25:37 -0500
Hello all, My question was not intended to start a 'smartest man in the room' debate.  I just had a genuine question.  Electronics is my hobby and never was my profession, so I can't get into the 'Gr
/archives//html/Amps/2022-12/msg00172.html (9,742 bytes)

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