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41. [AMPS] SB 220 repair (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Tue, 9 Nov 1999 08:11:40 -0000; I removed the grid chokes and was quite Er, you mean the grid was not grounded nor biased - and you were surprised it floated ? I hope it floated negative ! -- FAQ on WWW: http://www.contesting.com/a; /archives//html/Amps/1999-11/msg00224.html (7,053 bytes)
42. [AMPS] Confused about 'circulating currents' (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Wed, 10 Nov 1999 08:17:51 -0000; so good! I have always tried to use the biggest gauge that would fit and hoped it adequate. Skin effect makes it hard to work out the exact dissipation, and the Q is governed my many other things, b; /archives//html/Amps/1999-11/msg00251.html (8,180 bytes)
43. [AMPS] SB200 using 208VAC ? (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Wed, 10 Nov 1999 08:28:45 -0000; You mean voltage, not current. Solution is to use a variac that has the ability to boost the voltage by a bit. They usually do by 10% or so, providing up to 270V from 240V. (IF it does not, you migh; /archives//html/Amps/1999-11/msg00252.html (8,787 bytes)
44. [AMPS] The Best Value or Best AMP! (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Wed, 6 Oct 1999 16:26:22 +0100; Buy a cheaper one if you don't need full output. Put the saved money in a high interest long term account for your retirement. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@; /archives//html/Amps/1999-10/msg00244.html (8,404 bytes)
45. [AMPS] Spurii (again) (score: 1): Author: Mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Sat, 9 Oct 1999 12:05:53 +0100; Does anyone have any experience with parasitic suppression techniques for valve amplifiers at 70MHz. Note this is not anything to do with HF amplifiers etc. The HF methods of supressing VHF parasitic; /archives//html/Amps/1999-10/msg00324.html (6,884 bytes)
46. [AMPS] COAX (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Thu, 14 Oct 1999 17:00:28 +0100; Something tells me there is some exaggeration going on here. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.c; /archives//html/Amps/1999-10/msg00452.html (7,400 bytes)
47. [AMPS] SB-1000/AL-80A power xmfr $70 + UPS (score: 1): Author: mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Thu, 23 Sep 1999 15:26:23 +0100; a I also have one of these, but mine weighs only 17 pounds. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.co; /archives//html/Amps/1999-09/msg00239.html (7,505 bytes)
48. [AMPS] Re: (score: 1): Author: mike@g0mjw.freeserve.co.uk (Mike Willis); Date: Mon, 2 Aug 1999 14:20:47 +0100; It rather depends what you consider useful. The 43P circuit takes forever to fall back and just sits at the maximum reading when used with SSB. This is good in contests as it stops the operator cont; /archives//html/Amps/1999-08/msg00023.html (8,081 bytes)
49. [AMPS] AL811H saga continues (score: 1): Author: mike@g0mjw.freeserve.co.uk" <mike@g0mjw.freeserve.co.uk (M.J.Willis); Date: Thu, 1 Jul 1999 11:21:22 +0100; I got the new Svetlana 811a tubes from RES in today and dropped them in tonite, but still can't get full power out of the amplifier. I can load the amp up with up to 200ma grid current, 450 ma plate; /archives//html/Amps/1999-07/msg00003.html (7,835 bytes)
50. [AMPS] Two EHT Transformers (score: 1): Author: mike@g0mjw.freeserve.co.uk" <mike@g0mjw.freeserve.co.uk (M.J.Willis); Date: Mon, 21 Jun 1999 08:26:20 +0100; I have just obtined a nice EHT transformer 1800-0-1800 V at 450ma DC. 50Hz. This will give via a full wave rectifier circuit 2.5kV. Not sure of the current but probably quite a bit, it weighs 20kg an; /archives//html/Amps/1999-06/msg00550.html (7,792 bytes)
51. [AMPS] 3-500Z Grid Current Rating (score: 1): Author: mike@g0mjw.freeserve.co.uk" <mike@g0mjw.freeserve.co.uk (M.J.Willis); Date: Tue, 4 May 1999 10:29:05 +0100; I have a single 3-500Z amplifier. When I run it at 2.4kV EHT at the rated 400mA of anode current, I get 450W out with 130mA grid current and 60W drive. This is on 50MHZ. The problem with this is the; /archives//html/Amps/1999-05/msg00028.html (8,262 bytes)
52. [AMPS] HV CAPACITORS (score: 1): Author: mike@g0mjw.freeserve.co.uk" <mike@g0mjw.freeserve.co.uk (M.J.Willis); Date: Tue, 12 Jan 1999 08:20:44 -0000; Looking for an EHT capacitor, 4kV 30-40uF, 2Amps 100Hz. Mike -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com; /archives//html/Amps/1999-01/msg00157.html (6,760 bytes)

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