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41. [Amps] Power-off tube cooling (score: 1): Author: RFlabnotes@aol.com; Date: Thu, 15 Jan 2004 10:55:54 EST; I am curious about the origin of this mythology. It would be nice to see some factual data, or, at least, logic to support it. My simple-minded physical reasoning says that when the power is all remo; /archives//html/Amps/2004-01/msg00159.html (7,449 bytes)
42. Re: [Amps] Power combiners and antennas??? (score: 1): Author: RFlabnotes@aol.com; Date: Tue, 20 Jan 2004 13:12:09 EST; Jim: The idea of completely tandem RF chains is intriguing, and would avoid most or all issues connected with simplex failure. However, one additional requirement would be that you would have to insu; /archives//html/Amps/2004-01/msg00206.html (7,197 bytes)
43. Re: [Amps] transformer secondary winding resistance here we go again (score: 1): Author: RFlabnotes@aol.com; Date: Tue, 20 Jan 2004 13:20:36 EST; Chuck: The key to your statement is "...is capable of handling....", whatever that is supposed to mean. The basic fact is that if the secondary has R ohms of resistance, then with a load of I amperes; /archives//html/Amps/2004-01/msg00207.html (7,732 bytes)
44. [Amps] Voodoo death rays from amplifier windows (score: 1): Author: RFlabnotes@aol.com; Date: Thu, 4 Mar 2004 17:57:05 EST; I have calculated the magnitude of the circulating harmonic currents in the tank coil of a typical PI-NET amplifier (Q=9) and found them to be well under -60dbc from 7f and up. Since the field of the; /archives//html/Amps/2004-03/msg00047.html (7,205 bytes)
45. [Amps] Winding plate inductors - No sweat (score: 1): Author: RFlabnotes@aol.com; Date: Fri, 12 Mar 2004 00:35:04 EST; The venerable formula for a solenoidal inductor has been with us for over 60 years, and is really all you need. I have wound hundreds of coils based on this formula and whenever I have taken the time; /archives//html/Amps/2004-03/msg00122.html (7,184 bytes)
46. Re: [Amps] Grounded B+ amplifier (score: 1): Author: RFlabnotes@aol.com; Date: Fri, 12 Mar 2004 12:35:30 EST; Bill: You asked for comments, so here goes (short and sweet). I have never had to spend more than about half an hour with some magnet wire and pieces of PVC or fiberglass tubing to come up with a goo; /archives//html/Amps/2004-03/msg00130.html (6,916 bytes)
47. [Amps] RF Insulation (score: 1): Author: RFlabnotes@aol.com; Date: Fri, 26 Mar 2004 10:43:28 EST; The problem with all of this discussion is the casual use of the term 'RF fields". In fact, the electric field inside of a solenoidal inductor (a/k/a plate choke) is quite small, almost negligible. T; /archives//html/Amps/2004-03/msg00286.html (8,196 bytes)
48. [Amps] Filament supply (score: 1): Author: RFlabnotes@aol.com; Date: Wed, 28 Apr 2004 18:27:14 EDT; I have been using switching controllers for filaments for over 10 years. They offer the ideal way to precisely control filament voltage and current, and rampup electronically. I have had no trouble e; /archives//html/Amps/2004-04/msg00239.html (6,610 bytes)
49. [Amps] Vacuum relay speed (score: 1): Author: RFlabnotes@aol.com; Date: Wed, 5 May 2004 13:28:48 EDT; I have had the unfortunate of experience of breaking a few of them. The small ones, like the HC1 and RJ22, which are the fastest, get their speed from two main factors (my opinion, based upon a physi; /archives//html/Amps/2004-05/msg00052.html (7,303 bytes)

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