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81. [Amps] G-G Amplifiers With No Tuned Input. (score: 127): Author: 2 at vc.net (2); Date: Fri May 2 08:30:56 2003; Amplifiers such as the MLA-2500, SB-230, 374, 78, and 76PA have no tuned input. This is not a problem when such a g-g amplifier is driven by a tube-output radio such as the TS-830S. The reason is tha; /archives//html/Amps/2003-05/msg00009.html (8,863 bytes)
82. [Amps] G-G Amplifiers With No Tuned Input. (score: 127): Author: 2 at vc.net (2); Date: Fri May 2 08:30:53 2003; Amplifiers such as the MLA-2500, SB-230, 374, 78, and 76PA have no tuned input. This is not a problem when such a g-g amplifier is driven by a tube-output radio such as the TS-830S. The reason is tha; /archives//html/Amps/2003-05/msg00007.html (8,738 bytes)
83. [Amps] TL-922 10 meter conversion (score: 127): Author: 2 at vc.net (2); Date: Thu May 1 08:51:31 2003; - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-05/msg00003.html (6,704 bytes)
84. [Amps] Testing 3CX800s? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 28 09:01:32 2003; ? I was able to make two 3cx800A7s with loose gold inside the envelope stop flashing over by tapping on the top of the "plate" cap with the flat side of a 4oz ballpeen hammar. This procedure moves l; /archives//html/Amps/2003-04/msg00221.html (8,662 bytes)
85. [Amps] 4pr1000 heater voltage? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 28 09:01:26 2003; Andy -- According to Econco Broadcast Services, one method of determining optimal filament potential is to tune up the amplifier for max pep @ max drive at the nominal filament V, then adjust the fil; /archives//html/Amps/2003-04/msg00220.html (7,269 bytes)
86. [Amps] 6M 8171 (score: 127): Author: 2 at vc.net (2); Date: Wed Apr 23 08:55:47 2003; roughly 1200-ohms of RL would also be the case at 1.5kW out if anode supply V and anode A remained in the same ratio. ** The standard of veracity about moonbounce amplifiers was set c. 42-years ago; /archives//html/Amps/2003-04/msg00211.html (8,181 bytes)
87. [Amps] 6M 8171 (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 21 16:40:06 2003; ? The RL of an 8171 is c. 1200?, so, at 50MHz, a total C-Tune of roughly 80pF is needed for a Q of 15. Since the anode-screen C, stray C, and the neutralizing bridge total c. 30pF, a 50pF Tune-C sho; /archives//html/Amps/2003-04/msg00205.html (9,559 bytes)
88. [Amps] 4pr1000 heater voltage? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 21 16:40:03 2003; ? ... not for those who have a free supply of 4PR1000As. For those who don't, 7.2v is mo' betta. -- The math: Since relative emissive life of a thoriated tungsten cathode is (E1/E2)^23.4, 8.3v/7.2v^; /archives//html/Amps/2003-04/msg00204.html (6,817 bytes)
89. [Amps] 3CX1500/3CPX1500 (score: 127): Author: 2 at vc.net (2); Date: Sun Apr 20 08:31:02 2003; Good point, Paul. The Eimac data sheet: http://www.cpii.com/eimac/catalog/163470.htm. Changing the primary tap on the Henry 4K-Ultra should accomodate the heater requirement. - R. L. Measures, a.k.a; /archives//html/Amps/2003-04/msg00193.html (7,189 bytes)
90. [Amps] 3CPX1500A7 vs 3CX1500A7 (score: 127): Author: 2 at vc.net (2); Date: Sat Apr 19 09:30:22 2003; Yes, Pete. The principle difference is that the Pulse version has a longer leakage path anode insulator than the 3CX1500A7. However, for operating in La Paz (at 12,000 ft altitude), the P version mig; /archives//html/Amps/2003-04/msg00187.html (6,920 bytes)
91. [Amps] SB-220 improved efficiency in CW? (score: 127): Author: 2 at vc.net (2); Date: Thu Apr 17 09:16:16 2003; One S-unit increase is doubling the Rx signal V. Since P = E^2 /R. 2^2 = 4x, 4x = 400%. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00181.html (8,702 bytes)
92. [Amps] SB-220 improved efficiency in CW? (score: 127): Author: 2 at vc.net (2); Date: Wed Apr 16 21:30:02 2003; ? The ZSAC with a SB-220 is already ok in the CW mode since the anode current decreases with lower anode V. Decreasing ZSAC further would result in increased input SWR. Even if RF-out were increased; /archives//html/Amps/2003-04/msg00180.html (7,580 bytes)
93. [Amps] Re: PS project part2 (score: 127): Author: 2 at vc.net (2); Date: Wed Apr 16 08:19:22 2003; /archives//html/Amps/2003-04/msg00168.html (7,207 bytes)
94. [Amps] Re: PS project part2 (score: 127): Author: 2 at vc.net (2); Date: Wed Apr 16 08:19:15 2003; ? I agree. However, near-field RF could still be induced on the coax shield going to the balanced tuner, so I would still use a coax choke to minimize RF getting into the radio-room. // Does the tun; /archives//html/Amps/2003-04/msg00167.html (8,695 bytes)
95. [Amps] QRO Balun? (score: 127): Author: 2 at vc.net (2); Date: Tue Apr 15 15:17:23 2003; my wheel transformer quasi ? Phil -- The claim is undoubtedly inane. I would take this statement to mean that either the advertising writer who made the claim knows little about amplifiers, or that; /archives//html/Amps/2003-04/msg00159.html (9,322 bytes)
96. [Amps] voltage doubler for 3 phase supply? (score: 127): Author: 2 at vc.net (2); Date: Tue Apr 15 10:00:58 2003; ? As I see it, in order to make a three-phase transformer work in FWD service, the common connection between the 3-windings needs to be disconnected, and 3 isolated FWD circuits utilized. The D.C. o; /archives//html/Amps/2003-04/msg00154.html (8,156 bytes)
97. [Amps] Re: PS project part2 (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 14 13:03:14 2003; ? Some workarounds: 1. put a RF bypass C across the RCD. 2. add a coaxial RF choke [4 to 5-metres of coax wound single-layer on 3" to 4" ABS plastic sewer pipe] to the dipole's feedline to keep RF f; /archives//html/Amps/2003-04/msg00143.html (8,671 bytes)
98. [Amps] QRO HF-2500DX (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 14 13:03:12 2003; ? A 4:1 balun allows the Pi-network tank to be designed for 200? output, and thus use a smaller amount of Load-C than would be needed for a 50? output design. However, the tradeoff is that, for 1600; /archives//html/Amps/2003-04/msg00142.html (7,448 bytes)
99. [Amps] Question about ampifiers (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 14 13:03:06 2003; One solution it to use a 20v or so, 10A transformer to boost the needed potential to c. 240v. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00141.html (9,031 bytes)
100. [Amps] SB-220 C-21 question (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 14 12:51:43 2003; ? C21 RF-bypasses the filament so that equal drive will be applied to both sides of the filament when one side is driven. The amplifier would probably work without C21, but I would not remove it. -; /archives//html/Amps/2003-04/msg00140.html (7,080 bytes)

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