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41. [Amps] MLA2500 Multimeter Type? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 30 Oct 2002 10:19:03 +0000; 100uA I think. The HT series resistors are 3M in my circuit. Changing the grid shunt resistor to something higher makes life easier. Given that the tubes are rare, I reckon that changing the blower t; /archives//html/Amps/2002-10/msg00312.html (7,030 bytes)
42. Fw: [Amps] cap ratings in tank ckt (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 4 Sep 2002 08:10:48 +0100; them, circuit? Without seeing the schematic I'm guessing, but they could be 'Hi-Q' ceramic chips, often referred to as 'ATC', although ATC is but one manufacturer (Dielectric Labs, Johanson and Murat; /archives//html/Amps/2002-09/msg00025.html (8,355 bytes)
43. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 4 Sep 2002 20:10:24 +0100; I'd suggest using the Duncan PSU designer prog. to model your PSU and get a figure for the rms (=heating) current in the caps. Then use a low voltage transformer and variac to get that much current t; /archives//html/Amps/2002-09/msg00028.html (8,537 bytes)
44. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 5 Sep 2002 08:14:11 +0100; --Original Message-- From: Bill L. Fuqua <wlfuqu00@uky.edu> To: ko4nrbs@yahoo.com <ko4nrbs@yahoo.com> Cc: amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 05 September 2002 0; /archives//html/Amps/2002-09/msg00034.html (8,562 bytes)
45. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 5 Sep 2002 22:41:55 +0100; --Original Message-- From: William Fuqua <wlfuqu00@uky.edu> To: Ian White, G3SEK <g3sek@ifwtech.co.uk>; amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 05 September 2002 16:; /archives//html/Amps/2002-09/msg00041.html (9,992 bytes)
46. [Amps] Phillips BLF177 Transistor (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 12 Sep 2002 18:07:47 +0000; No. It's more like a MRF150 but with higher gain (20 vs 17dB min. at 30MHz, typ. 19 vs 12.5dB at 108MHz). Other differences (BLF177 first) - Cin 580 vs 350pF, Cout 190 vs 250pF Crs 14 vs 50pF. Steve; /archives//html/Amps/2002-09/msg00093.html (6,609 bytes)
47. [Amps] Bird thrulines (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 17 Sep 2002 07:37:09 +0100; The thruline plugin is basically just a mechanical variant on a transmission line coupler. There's a length of pickup line terminated in a resistor at one end, feeding a series diode at the other. Th; /archives//html/Amps/2002-09/msg00111.html (7,964 bytes)
48. [Amps] Question To the guru's (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 20 Sep 2002 19:10:25 +0000; mcs is the lazy form. It should be Mc/s - Mega cycles per second (as opposed to milli cycles per second). Steve; /archives//html/Amps/2002-09/msg00154.html (7,155 bytes)
49. [Amps] Fw: Tank tweaking (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 23 Sep 2002 09:47:33 +0000; HP thermistor power meters (431/435 etc.) dive off by around 25% below 5MHz. Had me scratching my head for a while. Steve; /archives//html/Amps/2002-09/msg00200.html (7,572 bytes)
50. [Amps] 4CX250F Tubes (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 24 Sep 2002 07:55:45 +0100; The Mk1 manual I found on the web talks about 2500V on full load, and up to 2900V off load, 2600V idling. I reckon that's asking for problems with the '250. At the very least, you would have to be ex; /archives//html/Amps/2002-09/msg00221.html (7,592 bytes)
51. [Amps] al80a (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 2 Aug 2002 06:47:42 +0100; the A genuine question on my part, not meant to appear critical of Carl in any way. You described the tube as 'laid' on the bench - if this is on its side rather than standing up, will the filament s; /archives//html/Amps/2002-08/msg00014.html (9,021 bytes)
52. [Amps] ALPHA 77 (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 5 Aug 2002 07:30:06 +0100; --Original Message-- From: Guillermo <nagato@arnet.com.ar> To: Phil Clements <philk5pc@tyler.net> Cc: Amplificadores Lineales <amps@contesting.com> To: <amps@contesting.com> Date: 05 August 2002 02:3; /archives//html/Amps/2002-08/msg00067.html (8,589 bytes)
53. [Amps] Loading terminology (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 6 Aug 2002 07:17:41 +0100; I think heavy/light refers to the effect of the load resistance seen at the plate. Less load C means lower plate resistance. I'm not sure how the terms heavy and light might have come into use, but t; /archives//html/Amps/2002-08/msg00081.html (7,104 bytes)
54. [Amps] New and old (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 6 Aug 2002 14:10:48 +0000; Something maybe of interest to those who like modern technology but are nostalgic for big glass tubes. I've just seen a press release from Cree, announcing that they are sampling a new Silicon Carbid; /archives//html/Amps/2002-08/msg00083.html (6,495 bytes)
55. [Amps] pictures (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 22 Aug 2002 07:21:24 +0100; A few years ago I bought an Olympus SLR with 1.4Mpix. I was recommended to the model by a camera enthusiast friend who pointed out that it had excellent optics. If that part is no good, all the digit; /archives//html/Amps/2002-08/msg00189.html (7,911 bytes)
56. [Amps] pictures (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 22 Aug 2002 12:02:50 +0000; Don't know if things have changed in the time since I got mine, but heavy use of the built in display wipes the batteries very quickly - I suspect that's why a lot of the other users commented on lik; /archives//html/Amps/2002-08/msg00193.html (7,852 bytes)
57. Heater volts, was RE: [Amps] Which 3-500Z (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 29 Aug 2002 14:24:03 +0000; I'm open to correction, but I think they're used in mainland China too. Steve; /archives//html/Amps/2002-08/msg00329.html (7,117 bytes)
58. [Amps] ETO Model 70 Amplifier (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 1 Jul 2002 21:21:18 +0100; --Original Message-- From: Paul Christensen <w9ac@arrl.net> To: amps@contesting.com <amps@contesting.com>; W0UN--John Brosnahan <shr@ricc.net> To: <amps@contesting.com> Date: 01 July 2002 20:57 Subje; /archives//html/Amps/2002-07/msg00016.html (7,658 bytes)
59. [Amps] Yaesu FL-7000 question? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 13 Jul 2002 07:14:56 +0100; transistor Possibly 2SB824. Steve; /archives//html/Amps/2002-07/msg00169.html (6,825 bytes)
60. [Amps] 2 x 4cx1500b Tube matching? (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 16 Jul 2002 07:47:43 +0100; matched tubes. I would also like to DC ground the screen and these boards dont appear to support grid driven DC grounded screen. The SEK board does support grounded screen. Bullet point 4 on the firs; /archives//html/Amps/2002-07/msg00214.html (7,308 bytes)

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