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41. [AMPS] 4-1000A Project (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Tue, 3 Apr 2001 15:13:37 EDT; --part1_4e.13c7d3d5.27fb7ae1_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Wynand, Considering efficieny being around 65% in class B the amp probably takes 12; /archives//html/Amps/2001-04/msg00022.html (9,531 bytes)
42. [AMPS] 4-1000A Project (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Tue, 3 Apr 2001 18:48:28 EDT; --part1_63.141b773e.27fbad3c_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit That is exactly my experience wirth QB5/1750 or the russian aquivalent. 12-13db of g; /archives//html/Amps/2001-04/msg00028.html (10,918 bytes)
43. [AMPS] 4-1000A Project (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Tue, 3 Apr 2001 20:38:16 EDT; --part1_14.1202919a.27fbc6f8_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Jon, With higher HT at the anode you get a higher ouput impedance RL, therefore the; /archives//html/Amps/2001-04/msg00036.html (11,622 bytes)
44. [AMPS] Re: QB5/1750 russian equiv. (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Wed, 4 Apr 2001 05:31:10 EDT; --part1_f8.8bb01a4.27fc43de_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit yo9fzs asked: What russian tube is the QB5/1750 equivalent (or what russian tube did; /archives//html/Amps/2001-04/msg00053.html (9,757 bytes)
45. [AMPS] Re: QB5/1750 russian equiv. (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Wed, 4 Apr 2001 07:42:18 EDT; --part1_dd.12812bfe.27fc629a_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Traian, You are right, possibly those tubes were not build in russia but DDR. We bou; /archives//html/Amps/2001-04/msg00055.html (8,838 bytes)
46. [AMPS] Re: 4-1000A Project (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Thu, 5 Apr 2001 11:30:19 EDT; --part1_c9.eaf86ee.27fde98b_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Jon, I run my 3 holer on all bands with almost same efficiency. A little bit less on; /archives//html/Amps/2001-04/msg00111.html (8,708 bytes)
47. [AMPS] 8877/GS35b (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Fri, 9 Mar 2001 19:08:48 EST; Hello all, The GS-35B is similar to the 8877 but has a much more rugged grid then the 8877, besides it does fine on 23cm as well. Of course it is not interchangeable with the 8877. Maximum power out; /archives//html/Amps/2001-03/msg00062.html (7,409 bytes)
48. [AMPS] 3CX3000A7 (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Mon, 12 Mar 2001 19:04:48 EST; Hi all, I am using the Henry 2500 PGC/27 as an amplifier on 10m without modification. Mechanically (socket,chimney etc) and electrically it is the same as the 3000D. Original frequency is 27,12Mc, un; /archives//html/Amps/2001-03/msg00108.html (8,111 bytes)
49. [AMPS] 3CX3000A7 (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Fri, 16 Mar 2001 20:25:29 EST; --part1_36.130c9101.27e41709_boundary Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable 2000 W output are to be expected e te Should be no problem to tune 10m; /archives//html/Amps/2001-03/msg00152.html (17,055 bytes)
50. [AMPS] Re: Hi Power Connectors (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Tue, 21 Nov 2000 06:40:05 EST; Hi folks My UHF and N-Connectors disappeared more then 15 years ago on all antennas. The UHF connectors by Spinner are really reliable and can take a lot of power but are not available for all types; /archives//html/Amps/2000-11/msg00255.html (8,195 bytes)
51. [AMPS] Hi Power Connectors (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Thu, 23 Nov 2000 07:29:54 EST; <According to MIL-PRF-39012, a series N plug is rated <for 1500 volts RMS <operating at sea <level when tested from 5.7 to 7 MHz. This corresponds <to 45KW across 50 Ohms. <This power rating will of; /archives//html/Amps/2000-11/msg00329.html (9,124 bytes)
52. [AMPS] Hi Power Connectors (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Mon, 27 Nov 2000 14:33:43 EST; I understand the dual 3CX3000 box is running not more then 1500 out with N-connectors... Type C is not produced anymore. Peter -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@cont; /archives//html/Amps/2000-11/msg00386.html (8,803 bytes)
53. [AMPS] Tank circuit heating (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Mon, 16 Oct 2000 16:47:43 EDT; Hello Peter, I should think that the previous AM-Transmitter tank-circuits of the 400W class were far better designed then todays 2KW amps. At the beginning of the sixties I started with ham radio an; /archives//html/Amps/2000-10/msg00400.html (7,116 bytes)
54. [AMPS] QB2/250 Vs813 (score: 1): Author: DF3KV@aol.com (DF3KV@aol.com); Date: Mon, 16 Oct 2000 16:49:50 EDT; Hello Firson, The two tubes are exactly identical. If you need them, I could scan the data-sheets. 73 Peter -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administ; /archives//html/Amps/2000-10/msg00401.html (7,186 bytes)
55. Re: [Amps] Siemens' 3-1000z similar ? (score: 1): Author: DF3KV@aol.com; Date: Thu, 23 Oct 2003 04:06:49 -0400; What type is it? Probably a TB4/1250? None of the Siemens triodes are for zerobias GG, you need some negativ gridvoltage to reduce dissipation, otherwise thes work very well in linears 73 Peter _____; /archives//html/Amps/2003-10/msg00215.html (6,931 bytes)
56. Re: [Amps] Benefits of 3-phase power? (score: 1): Author: DF3KV@aol.com; Date: Sun, 16 Nov 2003 09:10:06 -0500; Stable, much better regulation and far less ripple on rectifier circuits, just 4% ripple without any capacitor! almost everybody in western europe :-) 73 Peter _______________________________________; /archives//html/Amps/2003-11/msg00213.html (7,442 bytes)
57. Re: [Amps] 7527A (score: 1): Author: DF3KV@aol.com; Date: Tue, 23 Dec 2003 15:15:38 -0500; Hi Stef, You are right, the 7527 is the QB4/1100. They are doing fine in my L4B which I modified on the pin wiring, all grids connected to each other. They certainly need more drive then the 3-500Z.; /archives//html/Amps/2003-12/msg00355.html (6,489 bytes)
58. Re: [Amps] 160/80m amp tube recommendations (score: 1): Author: DF3KV@aol.com; Date: Wed, 31 Dec 2003 16:00:13 -0500; Hi Neil, If you are looking for a quiet amplifier use glass envelope tubes with radiating cooling like QB5/1750 etc. Also very nice when the low bands are open for DX to heat and illuminate the shack; /archives//html/Amps/2003-12/msg00495.html (7,226 bytes)
59. Re: [Amps] Grounded B+ amplifier (score: 1): Author: DF3KV@aol.com; Date: Fri, 27 Feb 2004 08:20:45 -0500; I do not think that is a good idea, you are just shifting the problems and have to reevent the weel, where for conventional layouts everything is known and optimized already. If you have problems win; /archives//html/Amps/2004-02/msg00282.html (7,773 bytes)
60. Re: [Amps] Switch-mode HV power supply (score: 1): Author: DF3KV@aol.com; Date: Tue, 16 Mar 2004 12:40:46 -0500; 4 PL/EL509/519 or 6KG6 with 900V on the plates do 1KW with ease. I used 6 PL519 in high-µ GG for a long time before we got the rule change in Germany away from dissipation limitation. That amp; /archives//html/Amps/2004-03/msg00177.html (9,252 bytes)

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