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Total 418 documents matching your query.

61. Re: [Amps] input matching question on the YC156? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 16 Sep 2004 14:59:38 -0700
Neil Carr G0JHC wrote: I set my input matching up for 1:0 SWR with the MFJ, at this time the heaters are not on. Soon as I switch them on SWR shoots up to 2:1, then over a 6 minute period gradually t
/archives//html/Amps/2004-09/msg00282.html (8,195 bytes)

62. Re: [AMPS] floating a filament transformer (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 17 Sep 2004 17:17:04 -0700
carl seyersdahl wrote: what would be the parameters for the toroid , for say , 8 or 10 amps , other than the size to accomodate the required wire size.??? Type 61 ferrite should work on 160-10 meters
/archives//html/Amps/2004-09/msg00317.html (8,600 bytes)

63. Re: [Amps] Collins 30L-1 / 572's B (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sun, 19 Sep 2004 07:52:35 -0700
Javier Remoto wrote: Hi, A friend of mine suggested me to change the 811's A at my 30L-1 for 572's B, does it make sense? Not really, because you would not get any more power unless you increase the
/archives//html/Amps/2004-09/msg00333.html (6,911 bytes)

64. Re: [Amps] James Millen Variable Capacitor (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Tue, 21 Sep 2004 10:54:30 -0700
David C. Hallam wrote: I have a James Millen air variable capacitor and the only marking I can find on it is 125Y5. None of my reference catalogs have any listing for Millen capacitors. Can anyone te
/archives//html/Amps/2004-09/msg00388.html (7,027 bytes)

65. Re: [Amps] Need for input tuning circuit (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sat, 09 Oct 2004 11:10:24 -0700
Bill L. Fuqua wrote: But, if you are only operating CW or FSK it is not needed. Due to the fact that intermodulation distortion is not an issue. You can operate class C. The only need for some ( very
/archives//html/Amps/2004-10/msg00117.html (7,930 bytes)

66. Re: [Amps] Need for input tuning circuit (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sat, 09 Oct 2004 17:40:24 -0700
DF3KV wrote: How was full class-C maintained on the opposite cycle, when no grid current flows? For full class-C the 813 has to be biased with -155V at 2250V EHT There needs to be a capacitor across
/archives//html/Amps/2004-10/msg00121.html (8,094 bytes)

67. Re: [Amps] Plate modulator xmfr ? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sun, 10 Oct 2004 07:45:58 -0700
StephenTetorka@cs.com wrote: Hi all: I need to better understand the workings of a plate modulator for AM. Considering the RF amp with 2 x 813's and the modulator with 2 x 813's - what are the equati
/archives//html/Amps/2004-10/msg00131.html (7,287 bytes)

68. Re: [Amps] T-442? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 15 Oct 2004 10:26:05 -0700
StephenTetorka@cs.com wrote: Hi guys: I got myself a Kenyon audio xmfr... model T-442...for my 813 work-in-prgress. The bugger is rated 600 watts and 45 lbs. Here is some connection info on Kenyon mu
/archives//html/Amps/2004-10/msg00219.html (7,015 bytes)

69. Re: [Amps] 5 kw amps -- why? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Tue, 19 Oct 2004 11:42:53 -0700
Mike Manship wrote: Quoting Joe Isabella <n3ji@yahoo.com>: Yes. MARS... How many MARS operators are authorized for 5000 watts ? I think he means working DX located on the planet Mars. By the way, I t
/archives//html/Amps/2004-10/msg00269.html (8,824 bytes)

70. Re: [Amps] 5 kw amps -- why? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 20 Oct 2004 08:38:51 -0700
R.Measures wrote: I bought this 195mph Ferrari because it has no heating problems at 65mph. That's not a good analogy, Rich. You bought the Ferrari because it can accelerate faster in the 0-85 MPH ra
/archives//html/Amps/2004-10/msg00302.html (9,041 bytes)

71. Re: [Amps] SELL: HV Plate Chokes (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 27 Oct 2004 19:53:30 -0700
w2cqm@juno.com wrote: B. National Radio R175A stacked bobbin HV plate choke with mounting brackets and standoff insulator. Separate windings act as parasitic traps for HF and WARC bands. Will handle
/archives//html/Amps/2004-10/msg00465.html (7,175 bytes)

72. Re: [Amps] Vacuum or Air? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 28 Oct 2004 08:37:30 -0700
StephenTetorka@cs.com wrote: Permit me to pose one: what factors (other than cost) should be considered in choosing between a vacuum variable and an air variable capacitor? Advantages of vacuum varia
/archives//html/Amps/2004-10/msg00489.html (7,563 bytes)

73. Re: [Amps] SB-220 (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 01 Nov 2004 18:27:13 -0800
R.Measures wrote: The high grid-I during a vhf parasite creates a lateral EMF on the hot filament helix. This occasionally bends the filament far enough sideways to short against the grid -- which is
/archives//html/Amps/2004-11/msg00012.html (7,751 bytes)

74. [Amps] SB-220 parasitic suppressors (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 03 Nov 2004 14:04:20 -0800
One reason that an SB-220 can develop VHF parasitics is the following: the original suppressors use 2-watt carbon composition resistors. These resistors tend to increase in value when they age, and e
/archives//html/Amps/2004-11/msg00048.html (6,730 bytes)

75. Re: [Amps] A Meeting Ground (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 04 Nov 2004 10:46:41 -0800
Bill Fuqua wrote: I have noticed some homebrew amplifiers I have purchased have the plate tuning capacitor grounded to the front panel. This is bad. Since all the fundamental and all the harmonic cur
/archives//html/Amps/2004-11/msg00077.html (8,000 bytes)

76. Re: [Amps] Ten-Tec Centurion (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 10 Nov 2004 16:54:33 -0800
Georgens, Tom wrote: My theory is that there may be power overshoot from the TS850 on the leading edge of the carrier that is causing the arcing. It is hard to see this on the wattmeter and my 3 othe
/archives//html/Amps/2004-11/msg00133.html (7,816 bytes)

77. Re: [Amps] Zero Crossing circuit (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 17 Nov 2004 15:24:24 -0800
Ken Warren wrote: I tried a zero crossing controller in a 750 volt power supply prior to running it on the 3KV plate supply and my experience was that the laminations in the transformer made so much
/archives//html/Amps/2004-11/msg00255.html (8,454 bytes)

78. Re: [Amps] Another GassyTube Question (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 19 Nov 2004 14:00:47 -0800
Scott Manthe wrote: However, when tuning it up on 15 meters yesterday, I noticed a blueish glow on the inside of the tube towards the plate choke. The blueish glow is definitely on the glass inside t
/archives//html/Amps/2004-11/msg00305.html (7,430 bytes)

79. Re: [Amps] vacuum relay failure (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 22 Nov 2004 08:36:08 -0800
Pete Smith wrote: I have replacement relays on the way, but would like to tap the experience on the list -- does this sound like just contact failure, or might there be something else in play? Is it
/archives//html/Amps/2004-11/msg00371.html (8,076 bytes)

80. Re: [Amps] Question: Ameritron AL-80A tuning (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 01 Dec 2004 09:22:27 -0800
NW7US, Tomas wrote: Hi, I am using an AL-80A and have need as an Army MARS and National Guard Net member to utilize frequencies far out of normal Amateur Radio allocations. I am finding it hard to ge
/archives//html/Amps/2004-12/msg00005.html (8,967 bytes)

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