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81. Re: [Amps] 20kw Dummy load? (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Fri, 13 Aug 2004 11:56:07 -0400; Dear Robin, Since you're UK-based, it would do no good to suggest US suppliers... However, UK-based television stations, when they do an annual POP or xmtr alignment, will rent a portable DL from som; /archives//html/Amps/2004-08/msg00125.html (8,664 bytes)
82. Re: [Amps] Filtering capacitor in a HV PS: How low can you get awaywith? (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 16 Aug 2004 13:13:08 -0400; Sr. Vilaseca, Immediately scrap all plans to use the 2.5KV capacitor. If your final DC voltage is targeted at 2500 volts your filter capacitor voltage should be at around 5KV so that the peaks of the; /archives//html/Amps/2004-08/msg00159.html (8,624 bytes)
83. Re: [Amps] RE: Need Help (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Tue, 17 Aug 2004 12:02:04 -0400; Dear Tom, The problem you mention is similar to a circumstance where a high-power audio reinforcement amplifier was being installed in a recording studio and someone heard a buzz and the speakers wer; /archives//html/Amps/2004-08/msg00180.html (8,979 bytes)
84. Re: [Amps] Case isolation of oiled-paper capacitors (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Wed, 18 Aug 2004 10:08:35 -0400; Sr. Vilaseca, In the ALPHA 77-series of amplifiers the oil-filled filter capacitors were mounted on a piece of foam rubber material, but had metal clamps securing their fastening, which clamps were g; /archives//html/Amps/2004-08/msg00194.html (7,793 bytes)
85. [Amps] Amplifier Surplus Parts & Tubes (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Wed, 18 Aug 2004 12:25:38 -0400; Gentlemen, The following source, << http://www.economyelectronic.com >> has a huge supply of high power RF parts including fixed & variable vacuum capacitors, oil-filled caps, xfmrs, chokes, RF switc; /archives//html/Amps/2004-08/msg00195.html (7,652 bytes)
86. Fw: Re: [Amps] Amplifier Surplus Parts & Tubes (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Wed, 18 Aug 2004 12:44:23 -0400; Dear Ladies and Gents, Please forgive my error, it is: << http://www.economyelectronics.com >> Hal _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c; /archives//html/Amps/2004-08/msg00197.html (6,651 bytes)
87. Re: [Amps] RF exposure limits in reality (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Wed, 18 Aug 2004 14:45:59 -0400; Dear Jason, While on rooftops and on towers working with the cellular BTS antennae we are required to wear NARDA RF detectors that beep when the radiation gets to them. In training to qualify for RF; /archives//html/Amps/2004-08/msg00205.html (9,450 bytes)
88. [Amps] SAFETY WITH HIGH VOLTAGE (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Fri, 20 Aug 2004 18:25:53 -0400; Ladies and Gents, When working on the outboard plate supply to my linear amplifier my hand accidently brushed the Positive HV stud on the beehive feedthrough and I became slightly airborne for a seco; /archives//html/Amps/2004-08/msg00244.html (7,820 bytes)
89. Re: [Amps] SAFETY WITH HIGH VOLTAGE (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Fri, 20 Aug 2004 22:53:21 -0400; To answer some of the questions: A beehive is a porcelain assembly that serves to insulate high voltage as it feeds through a chassis wall. Sometimes bigger beehive insulators are used to run antenna; /archives//html/Amps/2004-08/msg00250.html (7,954 bytes)
90. Re: [Amps] SAFETY WITH HIGH VOLTAGE (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 23 Aug 2004 11:49:03 -0400; Dear Peter, On very close examination of the wirewound that measures fifty some odd ohms, there IS a pinhole through the ceramic, about midway on the body of the resistor! Thank you. Hal Mandel KA1XO; /archives//html/Amps/2004-08/msg00269.html (9,054 bytes)
91. Re: [Amps] SAFETY WITH HIGH VOLTAGE (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 23 Aug 2004 12:14:13 -0400; Dear Roger, On top of the fact that I failed to verify the presence of HV on a set of terminals believed to be quiescent is the fact that a reasonably new component I spent hard-earned money to purch; /archives//html/Amps/2004-08/msg00270.html (11,279 bytes)
92. Re: [Amps] Centurion cooling improvement ideas for AM service (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Wed, 25 Aug 2004 18:24:45 -0400; Dear Sirs, In reading about how the SB-220 will be used on AM I wonder if any of the '220 users out there have connected a known-good 50 ohm dummy load AFT of the amplifier and a known-good Reflected; /archives//html/Amps/2004-08/msg00316.html (10,210 bytes)
93. [Amps] Spare Parts (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Thu, 26 Aug 2004 16:25:48 -0400; Hi Guys, Decided to yank out everything in the outboard supply and replace with broadcast-quality components. No more 50 watt bleeders. (They're now 2 units of OHMITE L225J100K at 225 watts rating.); /archives//html/Amps/2004-08/msg00342.html (7,276 bytes)
94. [Amps] Advice on Filament Protection Sought (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Thu, 26 Aug 2004 20:01:08 -0400; Sirs, The new amplifier will be running a pair of 3CPX1500A7 triodes with floating filaments through bifilar chokes, powered by 5 volts Direct Current through a floating bridge rectifier and filter.; /archives//html/Amps/2004-08/msg00359.html (8,060 bytes)
95. [Amps] Filament Protection (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Fri, 27 Aug 2004 13:51:58 -0400; Dear Rich, Thanks for the reminder. As far as the other parameters, EIMAC says that the maximum Anode voltage should be 7500 volts, with a maximum dissipation of 1500 watts, and a maximum plate curre; /archives//html/Amps/2004-08/msg00398.html (6,955 bytes)
96. [Amps] The White Smoke Escaped (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Sat, 28 Aug 2004 03:48:20 -0400; Gents, Doing a bench test of my new P.W.Dahl custom-wound filament transformer with no loads attached the breaker was on for under five seconds before the unit burned out. A small puff of white smoke; /archives//html/Amps/2004-08/msg00418.html (7,365 bytes)
97. [Amps] White Smoke (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Sat, 28 Aug 2004 05:05:06 -0400; Dear Rich, Thanks for the reply. The schematic of the xfmr, as supplied by PWD, shows the dual primary windings "side by side" (however vertically) with the associated pin-outs corresponding to the o; /archives//html/Amps/2004-08/msg00420.html (7,989 bytes)
98. [Amps] The White Smoke (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Sat, 28 Aug 2004 12:05:58 -0400; Dear Will, a manufacturing error fabricated the primary windings with connections 180 degrees opposite for one of the windings than the schematic pins-out and this caused the two windings to be out-o; /archives//html/Amps/2004-08/msg00434.html (7,121 bytes)
99. [Amps] White Smoke (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Sat, 28 Aug 2004 18:24:09 -0400; Dear Will, et al, The transformer, after igniting my draughting linoleum, showed an open in one of the primary windings. That must have been the "pop." Hal Mandel ____________________________________; /archives//html/Amps/2004-08/msg00438.html (6,757 bytes)
100. [Amps] load capacitor (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 30 Aug 2004 23:21:30 -0400; Dear Will, Last Winter, ALPHA Power directed me towards OE to get a special air-variable that would work in the new amp. After trying four or five times no one from that company would return my call; /archives//html/Amps/2004-08/msg00466.html (6,424 bytes)

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