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41. [AMPS] QB5/1750 russian equiv. (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 04 Apr 2001 08:48:43 +0300; What russian tube is the QB5/1750 equivalent (or what russian tube did you use instead of the QB5/1750)? It is the GU46? 73, Traian -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps; /archives//html/Amps/2001-04/msg00049.html (9,055 bytes)
42. [AMPS] Re: QB5/1750 russian equiv. (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 04 Apr 2001 13:19:23 +0300; Dear Peter, Thanks for answer. Indeed, the SRS457 is equivalent to QB5/1750, but was made in the ex DDR only, and this is why it can't be found here. I do not have any info about this tube to be buil; /archives//html/Amps/2001-04/msg00054.html (8,166 bytes)
43. [AMPS] HARRIS RF-110A (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Tue, 10 Apr 2001 12:34:44 +0300; Hello amps fellows, I have the possibility to buy an used/deffective Harris RF-110A HF amp. It is from an aircraft and is equipped with the RF-111 115V 3 phase 400 Hz power supply inside and have mis; /archives//html/Amps/2001-04/msg00226.html (7,623 bytes)
44. [AMPS] Re:PC power supplys (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 18 Apr 2001 10:02:24 +0300; Hello Nermin, I tried this with a 4-400 and it wasn't working. The low R of the high current, directly heated, cold cathode caused the PC switcher to lock into protection state. Usually, these protec; /archives//html/Amps/2001-04/msg00411.html (9,824 bytes)
45. [AMPS] Re:PC power supplys (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 19 Apr 2001 10:37:32 +0300; The main reason for using a PC PS is the need for a very well regulated filament voltage for the directly heated cathode tubes. We already know about the filament voltage topic. At my country QTH, th; /archives//html/Amps/2001-04/msg00433.html (10,469 bytes)
46. [AMPS] Re:PC power supplys (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 19 Apr 2001 10:55:00 +0300; Hello Harry, I used the PC switching PS also for general purpose, including the use of the 12 V output for power audio applications and DC motors. The output rectifier circuit can be modified for mor; /archives//html/Amps/2001-04/msg00434.html (8,238 bytes)
47. [AMPS] 3 phase transforers and single phase (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 19 Apr 2001 17:58:07 +0300; Hi all, I was investigating the possibility to use an inverter from rectified single phase 220V main (about 300V DC) to 3 phase 110V 400 Hz for an HF linear (max. 4 KW input) that was used on an airc; /archives//html/Amps/2001-04/msg00440.html (10,600 bytes)
48. [Fwd: [AMPS] 3 phase transforers and single phase] (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 20 Apr 2001 08:37:26 +0300; This is a multi-part message in MIME format. --FBDDF5D21DFAF01304CC78DD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit --FBDDF5D21DFAF01304CC78DD Content-Type: message/rfc; /archives//html/Amps/2001-04/msg00443.html (8,932 bytes)
49. [Fwd: [AMPS] 3 phase transforers and single phase] (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Sat, 21 Apr 2001 11:18:28 +0300; Hello Jeff, As many times happen, the simplest solutions are the best (we have to remember again about the KISS principle). As someone said before, maybe a starting capacitor can be used. Anyway, a s; /archives//html/Amps/2001-04/msg00450.html (7,858 bytes)
50. [AMPS] GU46 tube amp (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Sun, 29 Apr 2001 14:00:40 +0300; Hi amp fellows, Some NIB GU46 russian made glass tubes could be found here, sold directly to the YO hams by our amateur society and YO3 club at a very affordable price. It is a 500W 3 kV (directly he; /archives//html/Amps/2001-04/msg00569.html (6,662 bytes)
51. Re: [Amps] Harris 601 A/CU Antenna Coupler (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Thu, 09 Oct 2003 15:53:07 +0200; RF-601A: antenna coupler, fully automatic, 1 kW, matches a 4.6 to 10.7 meter whip antenna to 50 ohms from 2 to 30 MHz. Used with RF-110A and other Harris amps. As I know it comprise two units (one ou; /archives//html/Amps/2003-10/msg00071.html (7,593 bytes)
52. Re: [Amps] Conditioning Spare Tubes After Storage (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 14 Oct 2003 18:03:49 +0200; Hi all amp fellows, This topic was discussed before and at that time I draw attention about, but seems that few observed this. On the very first page of the Harris RF-110A amplifier manual is stated:; /archives//html/Amps/2003-10/msg00121.html (13,395 bytes)
53. Re: [Amps] Benefits of 3-phase power? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 17 Nov 2003 09:48:15 +0200; One of the best amp power supply is to use 3 phase transformer with two HV secondary windings. Conect one as delta and the other as Y. Use rectifiers for each then connect the rectified voltages in s; /archives//html/Amps/2003-11/msg00233.html (9,014 bytes)
54. Re: [Amps] Vacuum Relays for Sale (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 05 Jan 2004 15:44:51 +0200; The REW15 relay for sale on the specified web site is a well known russian COAXIAL relay, not vacuum. See http://www.nd2x.net/rew15.html for details. 73, Traian ______________________________________; /archives//html/Amps/2004-01/msg00047.html (7,468 bytes)
55. Re: [Amps] Horizontal or verticle? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 26 Jan 2004 18:33:40 +0200; a. For most of the indirectly heated ceramic tubes, the mounting position is specified as "any". b. For many amps, the ukrainian ham's are cooling the tubes (like the GU74 and GU43) using 5" axial fa; /archives//html/Amps/2004-01/msg00301.html (9,219 bytes)
56. Re: [Amps] Home-brew ceramic insulators? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Wed, 24 Mar 2004 18:08:43 +0200; I have used that kind of resin for making the connectors needed for the Harris RF-110A amp power supply cable. Just inserted properly sized contacts in the connector's body and filled with the resin; /archives//html/Amps/2004-03/msg00259.html (8,432 bytes)
57. Re: [Amps] 4-1000A in Passive grid-driven use? (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Thu, 29 Apr 2004 09:26:25 +0300; Hello Al, You may look at: http://www.dj2hz.de/4x4-1000.html http://www.dj2hz.de/1750.html which are actually using four QB5/1750 tetrodes, passive grid. Other nice amps on the same site: http://www.; /archives//html/Amps/2004-04/msg00243.html (7,919 bytes)
58. [Amps] power vacuum tube hi-pot and "conditioning" (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 03 May 2004 16:03:46 +0300; Hi all, Time ago I was testing the vacuum tubes for leakage current and breakdown voltage using the focus connections from CRT monitors, so the max. available voltage was 7500V from the very high out; /archives//html/Amps/2004-05/msg00030.html (12,117 bytes)
59. Re: [Amps] power vacuum tube hi-pot and "conditioning" (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 04 May 2004 09:23:28 +0300; Hello Peter, and thank you for answer. During my search on the web, I have reached some similar info as yours, but it seemed to be applied to very large power microwave tubes only and the vacuum ion; /archives//html/Amps/2004-05/msg00043.html (9,220 bytes)
60. Re: [Amps] power vacuum tube hi-pot and "conditioning" (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 04 May 2004 10:41:26 +0300; Hello Jos, Thanks for answer. The GU74 are NOS, never used, and were stored inside protective plastic buble bag. Did not see traces of dirt and I usually try touching them as less as possible, becaus; /archives//html/Amps/2004-05/msg00046.html (9,298 bytes)

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