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41. [AMPS] Tuned Input (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 18 Jan 98 15:49:16 -0800; - Eimac recommends using a Pi network tuned input. The Q needs to be roughly 2 (Xc1=25 ohms). . If you have the room, 6 tubes would be a bit more in line with the drive that current radios deliver.; /archives//html/Amps/1998-01/msg00058.html (7,121 bytes)
42. [Amps] Tuned input (score: 1): Author: Ku4uk@aol.com; Date: Tue, 18 Nov 2003 14:21:53 EST; I have an homebrew 4-1000 Amp. Built for 160,80,40 meters.GG No tuned input. Just a .01 transmitting mica at the cathode. SWR into amp is 2.1 from an Icom 756 on all three bands. Would like to have i; /archives//html/Amps/2003-11/msg00254.html (6,717 bytes)
43. [Amps] Tuned Input (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Thu, 19 Jan 2006 22:58:41 -0500; I don't know if any of you have looked into this particular product but at first glance it appears that this is one solution for the tuned input problem many of us face and at the right price too: <h; /archives//html/Amps/2006-01/msg00472.html (6,861 bytes)
44. Re: [Amps] Tuned Input (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 19 Jan 2006 21:45:42 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Wish I'd seen this before I did it the hard way. :-) $125 is a pretty good price. Bill, W6WRT _____________________________________; /archives//html/Amps/2006-01/msg00478.html (7,161 bytes)
45. Re: [Amps] Tuned Input (score: 1): Author: "Bob Selbrede, K6ZZ" <k6zz@ccis.com>; Date: Thu, 19 Jan 2006 21:43:27 -0800; Hey that's pretty nifty. I have the LDG AT-897 which is probably the same thing in a different package. It works FB. Too bad there isn't room for one in my MLA-2500 project amp. I wonder though, isn'; /archives//html/Amps/2006-01/msg00479.html (8,077 bytes)
46. Re: [Amps] Tuned Input (score: 1): Author: Hector Garcia XE2K <j_hector_garcia@sbcglobal.net>; Date: Fri, 20 Jan 2006 00:00:15 -0800 (PST); Looks a very easy solution to my MLA-2500 and don't burn the ICE bandpass filter that just handle 200w with low SWR. the problem is to use the tunner connected to the amp (amp OFF) with my radio at 2; /archives//html/Amps/2006-01/msg00482.html (8,148 bytes)
47. Re: [Amps] Tuned Input (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Fri, 20 Jan 2006 10:53:49 -0500; The purpose of the tuned input is to provide a "flywheel" effect to smooth out the variations of amplifier input impedance over the operating cycle. The Q of the circuit determines how much "flywheel; /archives//html/Amps/2006-01/msg00484.html (8,149 bytes)
48. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 20 Jan 2006 17:06:43 +0100 (CET); Has anyone ever come up with an equation for the input impedance of a GG stage in Class AB2? I guess the problem is that it's a variable with drive level - at very low level, where the stage is Class; /archives//html/Amps/2006-01/msg00485.html (8,111 bytes)
49. Re: [Amps] Tuned Input (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Fri, 20 Jan 2006 16:37:13 +0000; The recommendation for an input tuned circuit Q of 2-4 came from a 1961 article by Eimac authors in QST. That recommendation was specifically based on a pi tank, and it was also pointed out that the; /archives//html/Amps/2006-01/msg00486.html (9,706 bytes)
50. Re: [Amps] Tuned Input (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 20 Jan 2006 11:39:28 -0500; It just occurred to me that if you shunted the input of the amplifier with a capacitance who's reactance is say 1/5 of the input resistance the auto tuner will try to match it and thus you will get a; /archives//html/Amps/2006-01/msg00487.html (10,173 bytes)
51. Re: [Amps] Tuned Input (score: 1): Author: Scott Townley <nx7u@cox.net>; Date: Fri, 20 Jan 2006 13:32:16 -0500; Or a Delta Electronics "Operating Impedance Bridge"...which I have one of...maybe I'll do that this weekend on my 3-1000Z amp. Scott Townley NX7U Gilbert, AZ DM43di __________________________________; /archives//html/Amps/2006-01/msg00488.html (8,904 bytes)
52. Re: [Amps] Tuned Input (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 20 Jan 2006 15:20:31 -0500; These are very good points that raise questions that must be answered before I would consider using such a tuner as the input circuit. I'm with you Ian, I'd like to see the answers to the questions.; /archives//html/Amps/2006-01/msg00490.html (10,927 bytes)
53. Re: [Amps] Tuned Input (score: 1): Author: George badger <gbadger@sbcglobal.net>; Date: Fri, 20 Jan 2006 21:08:09 -0800 (PST); I have been using an antenna tuner as an input circuit for my HB 8877 lineart for years. When I was at EIMAC I learned that when linear amplifier OEMs complained of low efficiency it was often caused; /archives//html/Amps/2006-01/msg00495.html (13,406 bytes)
54. Re: [Amps] Tuned Input (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 21 Jan 2006 07:48:31 +0000; That's always been my understanding of what's best for the configuration. That's likely to have the side benefit of improving vhf stability. Steve _______________________________________________ Amps; /archives//html/Amps/2006-01/msg00497.html (8,830 bytes)
55. Re: [Amps] Tuned Input (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 21 Jan 2006 04:29:55 -0800; Adding a low-L resistor in series would help to reduce VHF-Q. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2006-01/msg00498.html (9,640 bytes)
56. Re: [Amps] Tuned Input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 21 Jan 2006 22:59:23 -0500; Could you elaborate a little more on this? Why is the efficiency less when a coil input is at the cathode? Also wouldn't "too much coax" provide extra capacitance to ground? I assume that the harmoni; /archives//html/Amps/2006-01/msg00500.html (15,366 bytes)
57. Re: [Amps] Tuned Input (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 22 Jan 2006 12:19:45 +0100; The reason why the type of input tuned circuit in a GG amplifier becomes critical is that the input and output circuits are effectively connected in series. This means that the plate current pulses a; /archives//html/Amps/2006-01/msg00501.html (18,137 bytes)
58. Re: [Amps] Tuned Input (score: 1): Author: R.Measures <r@somis.org>; Date: Sun, 22 Jan 2006 10:26:59 -0800; True, K. A.,. however, the needed amount of shunt C for 10m is not even close to the amount needed for 80m. Thus, most of the shunt C needs to come from C2 in the tuned inputs for the lower bands. Ri; /archives//html/Amps/2006-01/msg00503.html (19,444 bytes)
59. Re: [Amps] Tuned Input (score: 1): Author: w6ah@comcast.net; Date: Sun, 22 Jan 2006 20:33:27 +0000; Right you are Karl Arne. Using any type of coax between the output side of the network and the tube cathode is an open invitation for trouble. At harmonic frequencies that piece of coax can look like; /archives//html/Amps/2006-01/msg00505.html (20,304 bytes)
60. Re: [Amps] Tuned Input (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Sun, 22 Jan 2006 12:52:40 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ What a great idea! So obvious once someone hits you over the head with it. Thanks for sharing. 73, Bill W6WRT _____________________; /archives//html/Amps/2006-01/msg00506.html (7,892 bytes)

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