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41. [Amps] Swan Mark 1 (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Sun, 31 Mar 2002 10:33:12 -0600; Bill Smith <ko4nrbs@yahoo.com> asks IIRC, it would be plug-and-play except for the sockets (which ARE different but have good resale value) and possibly the geometry of the slightly larger tube envel; /archives//html/Amps/2002-03/msg00701.html (6,738 bytes)
42. [Amps] 12V 120A Switcihng Power supply? (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Sun, 31 Mar 2002 15:13:10 -0600; That's not to say we couldn't design one that used commonly available parts and was cheap to build in a modular fashion. 2N3055s will comfortably switch to 20 kHz at 60 V or 10A (200W diss max). Prem; /archives//html/Amps/2002-03/msg00717.html (9,240 bytes)
43. [AMPS] aLPHA 76 AND 78 tube conversions (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Sat, 2 Feb 2002 12:43:41 -0600; "Jimmy Jones" <jjones@etex.net> writes -- For your first point -- it's called "research." In some venues such as amateur radio, it's considered proper to share the results of one's experiments withou; /archives//html/Amps/2002-02/msg00028.html (11,016 bytes)
44. [AMPS] FS:ARRL-002 Hipersil Xfmr (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Mon, 4 Feb 2002 00:21:42 -0600; Doug and Rich shadow-boxed a little about the "Plywood box" -- Aww, I won't quote anybody. Jamming is bad, stepping on people who jam is bad, "using only the amount of power necessary to establish an; /archives//html/Amps/2002-02/msg00046.html (9,122 bytes)
45. [AMPS] Metron MA1000B 10M mod HELP (+remote head) (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Thu, 7 Feb 2002 10:19:11 -0600; Hi I've never been inside a Metron, but the technology in most SS amps is similar. I'd look for a trap or filter on the input side -- or a modification on the input transformer that attenuated signal; /archives//html/Amps/2002-02/msg00065.html (7,525 bytes)
46. [AMPS] Reference book for HP Paeco transformers? (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Thu, 7 Feb 2002 17:15:14 -0600; Hi This is probably something I should have surfed the web for before I asked, but -- Does anybody have or know of a catalog that provides pin-outs and ratings for the Paeco power transformers that H; /archives//html/Amps/2002-02/msg00067.html (7,388 bytes)
47. [AMPS] Reference book for HP Paeco transformers? (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Thu, 7 Feb 2002 17:55:28 -0600; EVonvaltie@aol.com writes... Magic? Hardly. VOM to locate the windings, a piece of paper to draw a picture, and a variac to bring voltage on the suspected primary up slowly. Removing the transformer; /archives//html/Amps/2002-02/msg00068.html (8,196 bytes)
48. [AMPS] aLPHA 76 AND 78 tube conversions (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Tue, 12 Feb 2002 15:06:51 -0600; I should probably go off on you, but I won't. Instead, it is my most fervent wish that you carry yourself and both your remaining brain cells down to the nearest real library, and look at professiona; /archives//html/Amps/2002-02/msg00115.html (9,921 bytes)
49. [AMPS] Schematic for AL-811H (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Wed, 13 Feb 2002 14:22:53 -0600; If you can't read the one from the AL-811H.PDF on the Ameritron site, look at Fig. 5-13 on page 302 of the RCA TT-5 book. Jim N6OTQ -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps; /archives//html/Amps/2002-02/msg00130.html (6,506 bytes)
50. [AMPS] SB-220 (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Thu, 14 Feb 2002 12:19:41 -0600; "Paul - VE3ZT" <VE3ZT@rac.ca> writes -- IIRC, Rich is the instigator of the notorious 555-based "pulser" tuning device, AKA "The Death Ray" at this QTH. A very useful aid for tuning. Jim N6OTQ -- FAQ; /archives//html/Amps/2002-02/msg00140.html (7,607 bytes)
51. [AMPS] High Voltage Toroidal Power Transformers (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Fri, 15 Feb 2002 09:28:39 -0600; Bill Smith <ko4nrbs@yahoo.com> Starting with the assumption that the toroidal power transformer is correctly enginnered and constructed -- It would be lighter, more efficient, less likely to radiate; /archives//html/Amps/2002-02/msg00153.html (7,915 bytes)
52. [AMPS] Alpha 78 (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Sat, 23 Feb 2002 10:06:46 -0600; "Devalue" a 78 by reducing its re-tube cost by $700?? One of the biggest reasons I've never wanted a 76 or 78 is the re-tube cost. My assumption is that even if I get one with good tubes, at some poi; /archives//html/Amps/2002-02/msg00239.html (8,573 bytes)
53. [Amps] Which is it 220, 230, or 240 volts, etc.?? (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Tue, 26 Feb 2002 15:02:39 -0600; Bill Smith <ko4nrbs@yahoo.com> sez -- If you're paying for a custom rewind, get extra taps above and below your usual "nominal" voltage. I would suggest 100, 105, 110, 120, 130, and 135 -- plus 2x al; /archives//html/Amps/2002-02/msg00292.html (7,841 bytes)
54. [AMPS] Chassis (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Tue, 1 Jan 2002 11:01:32 -0600; Colin "Lamb" <k7fm@teleport.com> said -- Here's a little known tip for working aluminum -- If you sandwich the aluminum sheet between two pieces of 3/4" birch cabinet plywood, you can cut and form it; /archives//html/Amps/2002-01/msg00005.html (7,568 bytes)
55. [AMPS] OT New Years stuff (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Tue, 1 Jan 2002 13:34:08 -0600; As I write this, I am listening to my General Radio Model 1211C Unit Oscillator, aka QRP rig #2, warm up long enough to settle for transmitting use. My listening toy? An old Singer communications ser; /archives//html/Amps/2002-01/msg00007.html (7,389 bytes)
56. [AMPS] Chassis (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Tue, 1 Jan 2002 17:06:19 -0600; R. L. Measures, AG6K adds -- A man after my own heart, and one whose two cents' worth goes even farther than my own! I forgot to mention using a saber saw on aluminum -- it works nicely, perhaps bett; /archives//html/Amps/2002-01/msg00009.html (7,392 bytes)
57. [AMPS] Building new 4-1000A amp (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Thu, 3 Jan 2002 20:06:17 -0600; "K7RDX" k7rdx@earthlink.net says -- So true. I got a 4-1000 off of ebay that the "fil tested good" -- but the filler nipple was broken off. Since you cannot perform a continuity check on the filament; /archives//html/Amps/2002-01/msg00043.html (9,625 bytes)
58. [AMPS] YC-179 Anyone (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Wed, 9 Jan 2002 22:21:20 -0600; And FWIW, the Eimac part number decomposes thusly: 3 Triode (4 = tetrode, 5 = pentode, 2 = diode) C Ceramic envelope (no letter = glass envelope or seal) P Pulse rated X External anode, forced air co; /archives//html/Amps/2002-01/msg00081.html (8,026 bytes)
59. [AMPS] Input matching experiment (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Sun, 13 Jan 2002 18:17:22 -0600; Hi The latest swapfest yielded up an old ultrasonic generator with an 812A. In my stacks of comic boo^H^H^H^H^H^H^H^H^H ARRL handbooks, I find a reference that the input impedance of a cathode-fed 81; /archives//html/Amps/2002-01/msg00093.html (8,466 bytes)
60. [AMPS] Input matching experiment (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Fri, 18 Jan 2002 08:37:51 -0600; Considering the wide range of answers I've received, as well as what certain "experts" have said vis-a-vis the "conventional" wisdom found in some 50-year-old publications, I think it's time to hook; /archives//html/Amps/2002-01/msg00123.html (8,502 bytes)

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