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1. Re: [Amps] Tuned input (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 24 Jan 2006 18:08:45 +0100; As the tube input impedance in GG is non-linear, the input circuit also helps in reducing phase distorsion caused by non-linear loading of the driver stage. This is elaborated in some detail in chapt; /archives//html/Amps/2006-01/msg00580.html (11,961 bytes)
2. Re: [Amps] Tuned input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 24 Jan 2006 11:23:39 -0500; Thanks Karl-Arne, very informative! Someone mentioned putting a capacitor directly at the cathode as part of the tuned input network to alleviate the inductance problem on 10 meters. It seems that wo; /archives//html/Amps/2006-01/msg00578.html (10,711 bytes)
3. [Amps] Tuned input (score: 1): Author: <sm0aom@telia.com>; Date: Tue, 24 Jan 2006 09:16:54 +0100 (MET); The reason for short-circuiting the harmonic currents in the cathode circuits is that they would cause voltage drops over the cathode circuit if not bypassed. As the cathode and plate circuits effect; /archives//html/Amps/2006-01/msg00576.html (8,527 bytes)
4. Re: [Amps] Tuned Input (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 23 Jan 2006 14:41:57 -0500; Can you explain why we care that harmonics are shown a low impedance in the cathode circuit? How does this effect efficiency? I read that Orr recommended around 13 pf capacitance per meter of frequen; /archives//html/Amps/2006-01/msg00550.html (21,152 bytes)
5. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 23 Jan 2006 12:51:55 +0100 (CET); G3SEK said: <the Collins authors show a driver with an output pi-tank, the magic length of line and a pi-tank input on the amplifier.> I believe that there was a 'magic length' that covered all the h; /archives//html/Amps/2006-01/msg00535.html (9,614 bytes)
6. Re: [Amps] Tuned Input (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Mon, 23 Jan 2006 11:37:41 +0000; Yes, they did, but that recommendation didn't rule out the use of a pi-tank. In the first edition of 'SSB Principles and Circuits', the Collins authors show a driver with an output pi-tank, the magic; /archives//html/Amps/2006-01/msg00534.html (8,754 bytes)
7. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 23 Jan 2006 10:54:02 +0100 (CET); 73 Peter SM/G3RZP This week - W6 next week!) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00533.html (7,969 bytes)
8. Re: [Amps] Tuned Input (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Sun, 22 Jan 2006 19:00:38 -0500; yes. 73, Tony W4ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00512.html (6,892 bytes)
9. Re: [Amps] Tuned Input (score: 1): Author: w6ah@comcast.net; Date: Sun, 22 Jan 2006 21:38:32 +0000; Allow me to provide clarification. I wrote: "A work around that he found was to remove the output cap on the input network bandswitch and attach it directly to the tube cathode." That should read: A; /archives//html/Amps/2006-01/msg00509.html (22,100 bytes)
10. Re: [Amps] Tuned Input (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Sun, 22 Jan 2006 16:08:33 -0500; Don't forge coax is has both inductance and capacitance. In fact the characteristic impedance is the squareroot of L/C. L and C are inductance per a unit of length. 73 Bill wa4lav True, K. A.,. howev; /archives//html/Amps/2006-01/msg00508.html (19,873 bytes)
11. 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)
12. 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)
13. 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)
14. 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)
15. 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)
16. 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)
17. 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)
18. 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)
19. 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)
20. 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)

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