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41. Re: [Amps] AMPS (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 21 Jul 2006 20:24:16 -0400; There is no K-202 on the schematic or parts list of the PA-374, PA-76 or PA-78 amplifiers on the BAMA site. Those are the only amplifiers produced by Alpha to use the 8874. In all three cases the gri; /archives//html/Amps/2006-07/msg00818.html (10,184 bytes)
42. Re: [Amps] AMPS (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 21 Jul 2006 23:59:23 -0400; Rich, where is K-202? Which diagram from Alpha? Rich, the manual clearly states if the grid-current overload occurs by itself the PTT is opened (which applies cutoff bias) since the likely cause is o; /archives//html/Amps/2006-07/msg00834.html (10,176 bytes)
43. Re: [Amps] 3cx3000A7 driver (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 22 Jul 2006 02:44:56 -0400; Mike, I'm surprised the seller didn't mention his time with NIMH <G>. Barnum would be proud. 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2006-07/msg00838.html (9,685 bytes)
44. Re: [Amps] AMPS (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 22 Jul 2006 02:44:56 -0400; If you would follow the schematic ... (or read the manual at page 5e) you will find it disables the PTT line if grid current is excessive. How odd ... Alpha does the same thing as G3SEK, WD7S, and an; /archives//html/Amps/2006-07/msg00839.html (7,118 bytes)
45. Re: [Amps] AMPS (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 22 Jul 2006 13:06:44 -0400; Anode potential falls to a very low level without corresponding high anode current? Amazing but not possible. The plate current pulse would cause the control board to take the HV off line and quench; /archives//html/Amps/2006-07/msg00880.html (10,058 bytes)
46. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Wed, 26 Jul 2006 09:08:02 -0400; Large power grid tubes can be very rugged, particularly when some of the newer materials are used in their grid structure. However, there are still some applications, Inductive Output Tubes (IOT) use; /archives//html/Amps/2006-07/msg01168.html (11,385 bytes)
47. Re: [Amps] Ameritron Amps (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sat, 29 Jul 2006 08:48:15 -0400; Can you walk into the local amateur radio store or pick up the phone and call HRO to order a 30L-1 at the same price? The 30L-1 also lacks 160 meters, tuned inputs and does not work well with modern; /archives//html/Amps/2006-07/msg01280.html (8,007 bytes)
48. Re: [Amps] Ameritron Amps (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 30 Jul 2006 09:03:23 -0400; ... from the QRO Technologies web site: HF-2000: Not Currently in Production 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte; /archives//html/Amps/2006-07/msg01368.html (11,060 bytes)
49. Re: [Amps] Grid Vs cathode drive (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Thu, 3 Aug 2006 08:25:54 -0400; The tuned input is visible in the picture about half-way down the page. 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2006-08/msg00086.html (7,459 bytes)
50. Re: [Amps] grid resonance (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 7 Aug 2006 13:19:30 -0400; Since a GDO is a hardware device, it cannot be deceptive. However, the results obtained by using a dip meter can certainly be deceptive because what is displayed is not always what the user THINKS is; /archives//html/Amps/2006-08/msg00264.html (9,749 bytes)
51. Re: [Amps] grid resonance (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Thu, 10 Aug 2006 01:04:10 -0400; N7WS' complete conclusions, which you continue to ignore and refuse to print, were that the same result could be obtained with a conventional suppressor by simply decreasing the value of the resistor; /archives//html/Amps/2006-08/msg00380.html (9,884 bytes)
52. Re: [Amps] Checking for IMD (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Fri, 11 Aug 2006 11:23:10 -0400; There are a couple of issues in a "poor man's spectrum analyzer" using sound card. 1) the mixer needs to be clean and handle a 60+ dB dynamic range. If it is overloaded it can generate IMD itself. 2); /archives//html/Amps/2006-08/msg00398.html (8,598 bytes)
53. Re: [Amps] Checking for IMD (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 14 Aug 2006 14:55:05 -0400; Gary, there is one problem with your analysis. Most modern rigs have an 8 to 15 KHz wide filter in the front end (first IF). This filter is symmetric around the "carrier." When switching to the oppos; /archives//html/Amps/2006-08/msg00487.html (9,077 bytes)
54. Re: [Amps] Checking for IMD (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 14 Aug 2006 16:59:52 -0400; That is possible depending on the frequencies and tone spacing, That depends entirely on the receiver gain distribution and AGC performance. Many receivers use AGC to turn down front end gain to pre; /archives//html/Amps/2006-08/msg00490.html (9,893 bytes)
55. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 27 Aug 2006 02:41:43 -0400; Rich, Your statements concerning the tests by N7WS are completely inaccurate. Your use of his graph without also reproducing his extensive analysis of the results is completely dishonest and distorts; /archives//html/Amps/2006-08/msg00691.html (10,951 bytes)
56. Re: [Amps] Need Tokyo High Power Amp Information (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 27 Aug 2006 09:32:30 -0400; Ron, The description indicates you have some kind or MRI amplifier ("magnet type" is the tip off). Tokyo High Power's primary business is MRI and industrial power amplifiers. Tokyo High Power has a w; /archives//html/Amps/2006-08/msg00694.html (9,012 bytes)
57. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 27 Aug 2006 10:55:45 -0400; You are presenting data out of context and misrepresenting Wes's work. That is intellectually dishonest and no different than the journalist or prosecutor who asks, "well Mr. Measures, please tell us; /archives//html/Amps/2006-08/msg00697.html (12,062 bytes)
58. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 27 Aug 2006 13:00:44 -0400; Rich's suppressors work but not for the reason that he claims. Nichrome is not a magic bullet and "low Q" or "Low Rp" is total nonsense. The instructions for the SB-220 (and any dual 3-500Z amplifier; /archives//html/Amps/2006-08/msg00706.html (12,036 bytes)
59. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Sun, 27 Aug 2006 15:15:07 -0400; Mikey, That is nothing more that rich has been doing to other participants of the Amps list for years. Frankly, his constant misrepresentation of Wes Stewart's work and work by others is far more "ch; /archives//html/Amps/2006-08/msg00722.html (10,688 bytes)
60. Re: [Amps] TL-922 question (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Tue, 29 Aug 2006 13:34:37 -0400; According to both the schematic in both the user manual and the service manual, there is no load fixed padder on 80 meters. The loading capacitor is dual section - 770 pF and 1150 pF according to the; /archives//html/Amps/2006-08/msg00775.html (13,714 bytes)

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