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1. [Amps] Anode Impedance of 4-400A (score: 1): Author: Patti <pthielking@earthlink.net>; Date: Tue, 15 Nov 2005 15:44:49 -0500 (GMT-05:00); Does anyone know the 'rough' load impedance of a pair of 4-400A's with 3500V on the anode? In some of EIMAC literature (W6SAI AS-1 Publication), there are tables, which list it as 5000 Ohms. Is this; /archives//html/Amps/2005-11/msg00191.html (6,896 bytes)
2. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 15 Nov 2005 17:31:33 -0500; Eric, For a parallel pair of 4-400A's, use plate voltage divided by 1.8 times the DC current. That will give you an value for impedance that is close enough for all practical purposes. David KC2JD Do; /archives//html/Amps/2005-11/msg00193.html (7,844 bytes)
3. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 15 Nov 2005 17:40:23 -0600; The load impedance of any tube or group of tubes is anode voltage under load divided by total anode current times 1.8. It matters not what the type or brand of the tube(s) are. A single 8877 amp that; /archives//html/Amps/2005-11/msg00198.html (8,101 bytes)
4. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: "Joe Subich, W4TV" <k4ik@subich.com>; Date: Tue, 15 Nov 2005 19:22:02 -0500; Phil, What class of operation, A, AB1, AB2, B or C and what conduction angle if class C? The 1.8 factor is an averaging factor based on conduction angle. For example, class A will be Ep/Ip while a si; /archives//html/Amps/2005-11/msg00201.html (10,018 bytes)
5. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 15 Nov 2005 20:04:39 -0500; I think we are nit picking here since the original request was for an approximation of Zp. However just to keep things going, I think a multiplier of 1.55/1.6 more closely approximates class A operat; /archives//html/Amps/2005-11/msg00203.html (11,538 bytes)
6. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Wed, 16 Nov 2005 06:00:19 +0100; I would figure AB2 instead. I´ve yet have to see a ham stay within AB1 with his amplifier. Also, this guy had the ARRL handbook, you can find all of this in that 1982 ARRL handbook. 73 Jim SM2E; /archives//html/Amps/2005-11/msg00225.html (8,419 bytes)
7. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Wed, 16 Nov 2005 14:25:12 +0100; Those tubes will be rather used in class B. Without grid-current they put out 1200W at 3,5KV anode voltage, with a total of 13mA grid current it will be about 1600W. On using the formula Ep/x*Ip one; /archives//html/Amps/2005-11/msg00239.html (12,358 bytes)
8. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 16 Nov 2005 08:46:42 -0800; On Nov 16, 2005, at 7:11 AM, Peter Voelpel wrote: True, if grid current is allowed to run higher then 1mA, but these tube family is not built for AB1, Eimac rates the 4-400A and 4-400C for Class AB1; /archives//html/Amps/2005-11/msg00254.html (14,914 bytes)
9. Re: [Amps] Anode Impedance of 4-400A (score: 1): Author: TexasRF@aol.com; Date: Thu, 17 Nov 2005 12:14:24 EST; I don't think this is correct. The k=1.8 or 1.6 or ??? covers this doesn't it? A triode doesn't operate with the plate voltage swinging down to near the grid potential; more like a similar value for; /archives//html/Amps/2005-11/msg00271.html (13,490 bytes)

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