Mail Archive Search: <+from:rakefet@rakefet.com>

Results:

References: [ +from:rakefet@rakefet.com: 234 ]

Total 234 documents matching your query.

41. [AMPS] Request for Advice Please (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 27 Nov 2001 12:40:33 -0800; If the TL922A is in good condition, I would prefer it. It is a very well-constructed unit. Of course, given its age, you would need to be sure that the tubes are not gassy and that the filter capacit; /archives//html/Amps/2001-11/msg00438.html (8,079 bytes)
42. [AMPS] True Or Not True #2 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 06 Sep 2001 13:32:30 -0700; And remember that db are additive, so 2 db from the amp plus 1 db from better coax, plus a db or two from optimizing the beam give you a whole s-unit (about 5 db on most modern s-meters). That's a VE; /archives//html/Amps/2001-09/msg00081.html (8,627 bytes)
43. [AMPS] SB-1000 mods? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 07 Sep 2001 12:31:45 -0700; I replaced the plate choke in mine with an AL80B choke purchased from Ameritron for about $25. The original plate choke had a resonance near 17 meters. I added a corona washer to the bandswitch lug t; /archives//html/Amps/2001-09/msg00109.html (8,395 bytes)
44. [AMPS] big bang (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 14 Sep 2001 08:05:43 -0700; The discussion over the past week or two on the need for a glitch resistor applies to you! Install a 25-ohm 50 watt vitreous-enameled power resistor in series with the plate RF choke. This will help; /archives//html/Amps/2001-09/msg00246.html (7,160 bytes)
45. [AMPS] FS: 3200v 1a CCS plate supply $395 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 25 Sep 2001 13:02:44 -0700; I thought this was sold, but here it is again: For sale, homebrew plate supply for RF amplifier. Has a brand new Peter Dahl hypersil transformer rated 2400 vac 1A CCS. Full wave bridge circuit puts o; /archives//html/Amps/2001-09/msg00415.html (7,379 bytes)
46. [AMPS] Noises in electrolytic capacitors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 28 Sep 2001 09:55:36 -0700; I don't know why this keeps coming up, but the SB-1000 and AL80B manuals talk about running the plate current up to 500 ma for a short period during tuning only, so that you can tune the tank for the; /archives//html/Amps/2001-09/msg00469.html (8,850 bytes)
47. [AMPS] Noises in electrolytic capacitors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 29 Sep 2001 08:44:21 -0700; statements. I'm sorry, I no longer have the SB-1000, and the AL80B manual I saw belonged to someone else. However, I'm sure someone has one and can quote the instructions, where it says to run it up; /archives//html/Amps/2001-09/msg00519.html (8,729 bytes)
48. [AMPS] Noises in electrolytic capacitors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 29 Sep 2001 09:08:43 -0700; Actually, I found the AL80B manual on the Ameritron web site (http://www.ameritron.com). Here is an excerpt from the tune-up discussion. Although the 400 MA figure is not mentioned (but see below), i; /archives//html/Amps/2001-09/msg00520.html (10,864 bytes)
49. [AMPS] Kenwood ts2000 driving a G2DAF amp (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 04 Aug 2001 20:26:23 -0700; I presume he is referring to my own favorite rig, the Elecraft K2. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/2001-08/msg00053.html (8,648 bytes)
50. [AMPS] 50~ vs 60~ ??? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 02 Jun 2001 09:56:20 -0700; It depends. Some transformers in US-made equipment are rated for 50/60 Hz and others are not. I used an SB-200 in Israel with no problems. However, if the transformer is not explicitly rated for 50 H; /archives//html/Amps/2001-06/msg00015.html (8,195 bytes)
51. [AMPS] PIN diodes (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 29 May 2001 10:25:44 -0700; I'm using vacuum relay QSK for my amplifiers, and I've been happy with it. I have had to replace one vacuum relay and one reed relay over the past few years (I think the reed relay damage was my own; /archives//html/Amps/2001-05/msg00496.html (6,913 bytes)
52. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 05 Apr 2001 23:21:56 -0700; I built a 3300v power supply with the intent to use it in a 50 Hz country as well as here in the US. I asked Peter Dahl about this. I was told that the magnetizing current in the primary of a large; /archives//html/Amps/2001-04/msg00128.html (8,278 bytes)
53. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 07 Apr 2001 13:57:50 -0700; No, it wasn't April 1. I too have used 50/60 Hz equipment such as the SB200 on 50 Hz without any trouble. I've also used 115v/60 Hz. US gear with step-down transformers on 230v/50 Hz. However, larger; /archives//html/Amps/2001-04/msg00169.html (8,705 bytes)
54. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 22 Mar 2001 08:25:07 -0800; Without getting into (God help me) the controversial Measures theory, it is a fact that carbon resistors in parasitic suppressors, such as are used in Heathkits, are prone to rise in value with heat; /archives//html/Amps/2001-03/msg00191.html (8,884 bytes)
55. [AMPS] Blue Flashes from SB-200 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 24 Mar 2001 09:54:44 -0800; Blue glow from the glass of the tube envelope is harmless; it's caused by electron bombardment. If it appears that the area inside the plate is glowing it may be a sign of gas in the tubes, in which; /archives//html/Amps/2001-03/msg00235.html (7,348 bytes)
56. [AMPS] Amps Power Conservation Measure (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 01 Feb 2001 09:02:11 -0800; Or you could just drive it with one of the Japanese transceivers that clip all of the dits and dahs (ICOM 706 comes to mind). 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/FAQ/amp; /archives//html/Amps/2001-02/msg00021.html (7,501 bytes)
57. [AMPS] Grid block keying of SB200 for QSK??? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 05 Feb 2001 08:00:19 -0800; Look at the QSK circuit on Rich Measures' web site, http://www.vcnet.com/measures/ It includes an 'Electronic Cathode Bias Switch' which cuts off the tubes on ket up. I've used this circuit successfu; /archives//html/Amps/2001-02/msg00118.html (7,357 bytes)
58. [AMPS] 77SX (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 02 Jan 2001 11:30:33 -0800; Are you sure they are not expecting the 'ground' wire to be a neutral? If so, they are expecting 115v between each of the hot wires and this neutral; what they are getting is 220v from one of the hot; /archives//html/Amps/2001-01/msg00054.html (8,573 bytes)
59. [AMPS] 77SX (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 02 Jan 2001 12:27:26 -0800; I've lived in Europe. My point was that the American 77SX units may have been wired expecting a connection to a 230-0-230 v circuit and they are now being plugged into a 230-G-0 circuit. I'm aware th; /archives//html/Amps/2001-01/msg00057.html (8,584 bytes)
60. [AMPS] 77SX (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 02 Jan 2001 12:51:15 -0800; Correct. By the way, my previous message was in error. I said 230-0-230 when I meant 115-0-115. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting; /archives//html/Amps/2001-01/msg00063.html (8,417 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]