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61. [Amps] al80a problem (richard) (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 13:48:38 -0700; ur welcome I could send you a kit if u like. You can pay from the invoice. Send adr & we send kit. High-speed switching, step-start. To check for a bent filament helix, one needs a high-potential te; /archives//html/Amps/2002-07/msg00207.html (7,617 bytes)
62. [Amps] Al-80a problem. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 15 Jul 2002 20:51:34 -0700; Or a flock of kamikaze fruit flies could have attacked. - Not according to N7WS' laboratory measurements of 100MHz Q on a HP Z-analyzer. My guess is that if you check the tube @8kV on a high-pot, yo; /archives//html/Amps/2002-07/msg00211.html (9,121 bytes)
63. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 16 Jul 2002 11:19:52 -0700; Not without potential grief. A more rugged and less costly cathode bias configuration is a series string of fwd-biased Si diodes. Each diode = 0.7v. // Also, the dissipation rating for zeners is @ 2; /archives//html/Amps/2002-07/msg00223.html (9,765 bytes)
64. [Amps] Your ideal HF mobile amp. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 1 Jun 2002 06:15:01 -0700; 1. Operates from 240v - 3-phase generator on trailer pulled behind. 2. Tetrode-with-handles tube using a mesh filament. 3. Hydraulicly raised /lowered antenna to allow passing under bridges/overpass; /archives//html/Amps/2002-06/msg00005.html (8,375 bytes)
65. [Amps] SB 200 input network rework? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 1 Jun 2002 16:31:14 -0700; The problem is too low of a Q. Decrease Xc (more pF) of the input cap to 18 - 25 ohms on each band, tune by reducing L and increasing the output C until swr of is under 1.2 to 1. - R. L. Measures, a; /archives//html/Amps/2002-06/msg00012.html (6,981 bytes)
66. [Amps] Swan Mark 1 Meter Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 4 Jun 2002 16:51:12 -0700; Apply a known current through the meter current shunts resistors and check the accuracy of the grid and the plate/anode current meters. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet; /archives//html/Amps/2002-06/msg00026.html (6,896 bytes)
67. [Amps] TL-922 Revisited. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 4 Jun 2002 17:32:43 -0700; Resistance-wire parasitic suppressrs are not a magic cure-all. They can reduce 120MHz-3-500Z gain to about half of what the stock supppressors yield - but only if they have enough L in the suppresso; /archives//html/Amps/2002-06/msg00027.html (10,337 bytes)
68. [Amps] SK-500 AIR SOCKET (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 5 Jun 2002 16:40:49 -0700; The trouble with an air-system socket and chimney is the air constriction in the socket. This reduces air flow and dictates that a high-speed, high noise-level blower be used. A superior cooling met; /archives//html/Amps/2002-06/msg00030.html (7,224 bytes)
69. [Amps] Strange Problerm (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 5 Jun 2002 21:37:59 -0700; ' loss then Good analysis, Gary. One possibility, especially with high-ohm wire-wound resistors. - Also, when one side of a FWD rectifier circuit opens, half of the electrolytic filter caps fail due; /archives//html/Amps/2002-06/msg00034.html (9,643 bytes)
70. [Amps] TL-922 Revisited. (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 6 Jun 2002 07:46:56 -0700; ? Can parasitics cause tube problems? In "Parasitics Revisited", *QST*, September/October, 1990, there is a photograph of a fil./grid shorted 3-500Z that apparently shorted when the amplifier sustai; /archives//html/Amps/2002-06/msg00040.html (13,261 bytes)
71. [Amps] HF Amp Loading Problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 7 Jun 2002 06:51:35 -0700; I would have a look at the bandswitch contacts. Also, the output & input bandswitch wafers on some models were adjacent to each other on the same shaft, sans-shield. IMO, this is not good engineerin; /archives//html/Amps/2002-06/msg00052.html (7,018 bytes)
72. [Amps] Strange Problerm (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 7 Jun 2002 21:32:21 -0700; It matters not whether the legs are balanced with tespect to neutral because the 240V primary is not connected to the neutral wire. Mr. Rauch was right. agreed One, open V-equalizer-resistor would c; /archives//html/Amps/2002-06/msg00055.html (11,156 bytes)
73. [Amps] electrolytic strings- equalizing resistors?? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 9 Jun 2002 15:20:23 -0700; A failed electroytic V-equalizer resistor dominoes the entire string of caps. A failed-shorted electrolytic can do the same thing if the other caps can't take the extra potential burden caused by a; /archives//html/Amps/2002-06/msg00061.html (10,136 bytes)
74. [Amps] electrolytic strings- equalizing resistors?? (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 9 Jun 2002 20:38:33 -0700; Good engineering practice says use good quality capacitors, high reliability resistors, both within their ratings, as well as a suitable glitch resistor to limit peak capacitor discharge current dur; /archives//html/Amps/2002-06/msg00062.html (13,588 bytes)
75. [Amps] Drake L7 issues (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 11 Jun 2002 17:34:11 -0700; what I check the breakdown V with a high-pot tester. 1000v is enough for the Load-C. 3500v is enough for the Tune-C. Clearly an act of sabotage. 6A diodes are not needed in a 0.800A ps. I would use; /archives//html/Amps/2002-06/msg00073.html (8,953 bytes)
76. [Amps] Driving Impedance (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 11 Jun 2002 17:38:04 -0700; With a 2w? grid, running it in g-g might not be a wonderful idea. The 4cx800 is designed for Class AB1, which means 0 grid current. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com; /archives//html/Amps/2002-06/msg00074.html (6,701 bytes)
77. [Amps] Drake L7 issues- update (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 12 Jun 2002 09:53:44 -0700; Randy they are history/RIP agreed Undersized is right. A 2w resistor does not limit peak fault current at 3kV. Some 10w resistors will. as a one legged FWD should do. I would buy 16 so that I had a c; /archives//html/Amps/2002-06/msg00081.html (8,513 bytes)
78. [Amps] Re: [Amps] Driving Impedance (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Wed, 12 Jun 2002 09:53:46 -0700; The tuned input circuits for the soon to be 10 amateur bands below 30 MHz are not a piece of cake for a Q of 2-3, which is needed with solid state transceivers driving G-G amplifiers. To fully cover; /archives//html/Amps/2002-06/msg00082.html (10,523 bytes)
79. [Amps] Looking for RF3A or RJ2B (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 13 Jun 2002 20:18:31 -0700; Fair Radio Sales Alan Emerald Allen Bond - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-06/msg00086.html (6,664 bytes)
80. [Amps] 4CX800/GU74B Socket (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 14 Jun 2002 05:59:53 -0700; A low-Z screen bypass is essential unless one is building an oscillator. Depending on lead lengths, a 1000pF disc-cap exhibits capacitive reactance up to around 50MHz - where it is resonant. Above r; /archives//html/Amps/2002-06/msg00090.html (9,164 bytes)

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