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321. Re: [Amps] time to death in the event of a blower failure (score: 1): Author: TexasRF@aol.com; Date: Mon, 8 Nov 2010 07:06:55 EST; Hi Jeff, that sounds like a really nifty device. Personally, I like the idea of having an air flow switch and your heat sensor. Easy for me to say huh? It seems that the air flow sensor could be set; /archives//html/Amps/2010-11/msg00038.html (9,312 bytes)
322. Re: [Amps] Blower Source (score: 1): Author: TexasRF@aol.com; Date: Sat, 13 Nov 2010 12:31:51 EST; And usually at better prices as well. Check the price of a hefty plate transformer for example. 73, Gerald K5GW In a message dated 11/13/2010 9:22:07 A.M. Central Standard Time, km1h@jeremy.mv.com wr; /archives//html/Amps/2010-11/msg00197.html (9,062 bytes)
323. Re: [Amps] Blower Source (score: 1): Author: TexasRF@aol.com; Date: Sun, 14 Nov 2010 06:37:21 EST; Hi Roger, to me, hefty means it can be picked up by hand but elicits a "grunt" in the process. Ameritron's largest transformer is used in the AL82/1200/1500 amplifiers. My AL1500 6m amplifier has a s; /archives//html/Amps/2010-11/msg00203.html (11,387 bytes)
324. Re: [Amps] Simpson 270 series 5 VOM (score: 1): Author: TexasRF@aol.com; Date: Mon, 15 Nov 2010 13:42:53 EST; Hi Pete, most of these kind of meters have a second and higher voltage battery for the high ohms scale.It is highly likely yours has one and it has exceeded its life. 73, Gerald K5GW In a message dat; /archives//html/Amps/2010-11/msg00252.html (7,438 bytes)
325. Re: [Amps] 2010 Handbook (score: 1): Author: TexasRF@aol.com; Date: Wed, 17 Nov 2010 07:46:11 EST; Well Paul, if you used alligator clips for the tube connections you could change the tube in half the time! 73, Gerald K5GW In a message dated 11/17/2010 5:19:00 A.M. Central Standard Time, paul@n1bu; /archives//html/Amps/2010-11/msg00297.html (8,956 bytes)
326. Re: [Amps] 2010 Handbook (score: 1): Author: TexasRF@aol.com; Date: Wed, 17 Nov 2010 09:38:44 EST; Now that band switching scheme shows some real innovation! I bet it never arced did it? I once built an amplifier that used a plexiglas disc/cam that pushed on scavenged relay leaf/contacts in a simi; /archives//html/Amps/2010-11/msg00302.html (10,688 bytes)
327. Re: [Amps] Building a Mock Up (score: 1): Author: TexasRF@aol.com; Date: Thu, 18 Nov 2010 11:38:56 EST; Both Lowes and Home Depot sell partial sheets of plywood of various thickness. Works well for mockup work. 73, Gerald K5GW In a message dated 11/18/2010 10:30:27 A.M. Central Standard Time, wc6w_amps; /archives//html/Amps/2010-11/msg00331.html (10,944 bytes)
328. Re: [Amps] source of '3rd harmonic' (score: 1): Author: TexasRF@aol.com; Date: Fri, 19 Nov 2010 05:27:33 EST; Hi Dan, the binocular transformer causes the two transistors in the amplifier to operate in a push-pull fashion. A characteristic of push-pull design is that the fundamental and all odd harmonics com; /archives//html/Amps/2010-11/msg00346.html (8,398 bytes)
329. Re: [Amps] brass or BNP hardware (score: 1): Author: TexasRF@aol.com; Date: Tue, 23 Nov 2010 06:33:24 EST; Virtually any metal can be silver plated, even aluminum. Depending on the material, there may be one or more layers of other material applied before the silver. Aluminum for example requires a layer; /archives//html/Amps/2010-11/msg00388.html (12,691 bytes)
330. Re: [Amps] Insulation tester (score: 1): Author: TexasRF@aol.com; Date: Fri, 26 Nov 2010 06:31:15 EST; Hi Don, the center tap of these transformers are connected to the case and therefore would be grounded. If you design your tester so that it operates with the output voltage referenced to ground, the; /archives//html/Amps/2010-11/msg00470.html (8,116 bytes)
331. Re: [Amps] A dual 4-1000 amp (score: 1): Author: TexasRF@aol.com; Date: Fri, 26 Nov 2010 08:02:03 EST; Since perception is everything, as they say, you might consider using an adequate blower for the amplifier and an audio recording of a jet plane takeoff to play in the background. This could save a t; /archives//html/Amps/2010-11/msg00474.html (9,743 bytes)
332. Re: [Amps] Sanity check (score: 1): Author: TexasRF@aol.com; Date: Fri, 3 Dec 2010 20:32:52 EST; That is an interesting plate choke variation. Can the idea be extended to include the lower bands as well? If so, the plate choke would be at a nominal 50 ohm point on all bands and exert very little; /archives//html/Amps/2010-12/msg00021.html (8,952 bytes)
333. Re: [Amps] AL-1200 pi input network. is manual right for correct "stock" LC v... (score: 1): Author: TexasRF@aol.com; Date: Mon, 6 Dec 2010 17:35:33 EST; Kevin, the input circuits are "kind of" a pi type on the higher bands as well. The missing C is furnished by the input C of the tube grid to cathode capacitance. I say "kind of" because the input C c; /archives//html/Amps/2010-12/msg00044.html (10,141 bytes)
334. Re: [Amps] Derating Dry Loads (score: 1): Author: TexasRF@aol.com; Date: Wed, 8 Dec 2010 08:16:54 EST; Or, as in one of the suggestions: with an SWR anticipator meter showing vswr at T+30 seconds! 73, Gerald K5GW In a message dated 12/8/2010 6:57:10 A.M. Central Standard Time, k9mk@flash.net writes: T; /archives//html/Amps/2010-12/msg00064.html (8,402 bytes)
335. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1): Author: TexasRF@aol.com; Date: Thu, 23 Dec 2010 07:00:04 EST; Hi Bruce, you mentioned "light operating" and that makes me wonder if you are running the amplifier at less than rated drive, plate current and power input/output? If so, the plate load impedance is; /archives//html/Amps/2010-12/msg00311.html (9,677 bytes)
336. Re: [Amps] Fuses (score: 1): Author: TexasRF@aol.com; Date: Sat, 8 Jan 2011 09:05:51 EST; All this talk about HV fuses got me wondering how quickly a fuse will blow. After some time googling, I realize this simple question is not so simple after all. So, is there a good reference that wil; /archives//html/Amps/2011-01/msg00085.html (8,785 bytes)
337. Re: [Amps] TWT Protection (was fuses) (score: 1): Author: TexasRF@aol.com; Date: Sun, 9 Jan 2011 10:33:52 EST; Hi Ian, it is good to hear from you again and thanks for the information. As you suggested, I am thinking that a second vacuum relay would be a good solution to the problem. If it was wired to shunt; /archives//html/Amps/2011-01/msg00110.html (9,814 bytes)
338. Re: [Amps] BVT problem (score: 1): Author: TexasRF@aol.com; Date: Sun, 9 Jan 2011 18:59:54 EST; So what does the primary voltage measure while this is happening? 73/K5GW In a message dated 1/9/2011 4:15:00 P.M. Central Standard Time, kk7uv@bresnan.net writes: Breakdown voltage tester. Built it; /archives//html/Amps/2011-01/msg00116.html (7,787 bytes)
339. Re: [Amps] Transformer adivice (score: 1): Author: TexasRF@aol.com; Date: Thu, 13 Jan 2011 08:31:12 EST; Dave the $410 transformer offered by Ameritron is used in their AL1200/1500/82 amplifiers and delivers about 3600vdc no load and good for 1A+ full load. If you are looking for a lower voltage/current; /archives//html/Amps/2011-01/msg00133.html (8,326 bytes)
340. Re: [Amps] A Filament Query (score: 1): Author: TexasRF@aol.com; Date: Sat, 15 Jan 2011 08:32:02 EST; Hi Denny and others, The 60 hour loss of life for each off/on cycle is new information for me. What is the mechanism that drives that? Are there methods to mitigate the effect? This subject just begs; /archives//html/Amps/2011-01/msg00152.html (8,304 bytes)

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