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41. [Amps] Alpha 86 (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 05:37:19 2003; I use very light petroleums that leave no residue, like xylene. Don't use anything silicon based! 73 Tom; /archives//html/Amps/2003-03/msg00235.html (7,644 bytes)
42. [Amps] Alpha 86 (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 05:39:37 2003; breakdown tune and proving replacement I don't know why they left that off. It makes a day and night difference in breakdown voltage of that contact. 73 Tom; /archives//html/Amps/2003-03/msg00236.html (8,686 bytes)
43. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 05:46:02 2003; IM products are not symmetrically dispersed Gary. Where they are USB or LSB depends on relative level (and I would guess phase, I need to think about that) of the original frequencies. 73 Tom; /archives//html/Amps/2003-03/msg00237.html (9,716 bytes)
44. [Amps] Alpha 86 (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 05:49:49 2003; The anti-corona washer is on the switch terminal from the 160 padder doorknob. The AL80 series all have them. That is the highest voltage point on the switch, and the washer distributes the electric; /archives//html/Amps/2003-03/msg00238.html (8,618 bytes)
45. [Amps] Alpha 86 (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 06:02:31 2003; No, it does not and is not! It is a conductive washer that distributes the electric field. An insulated washer would actually have the opposite effect, and reduce voltage breakdown of the contacts!!; /archives//html/Amps/2003-03/msg00239.html (8,728 bytes)
46. [Amps] MRF150 based 1500 watt amp design/cost (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 06:15:57 2003; filters, Solid state amps do not like high Q networks located very near the output devices. Best to have a multi-section low-Q filter and then put the high-Q stuff after that, and hopefully through; /archives//html/Amps/2003-03/msg00241.html (8,652 bytes)
47. [Amps] Arcing (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 10:10:17 2003; Almost everyone who knows anything in any depth about electronics and electric fields understands that sharp points and protrusions greatly increase voltage gradient, and reduce voltage breakdown be; /archives//html/Amps/2003-03/msg00256.html (8,848 bytes)
48. [Amps] Use of Manual T/R Switches (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 10:26:45 2003; Corona. What I used to do was hang my feedlines down from the top of a plywood board nailed to the wall. The board was covered with thin copper foil. The shields were connected to the copper by wood; /archives//html/Amps/2003-03/msg00259.html (9,061 bytes)
49. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 22:15:53 2003; High order products have little or nothing to do with low order products. Some systems go out "forever" in IMD bandwidth while others, with the same or even higher close-spaced IM levels, roll off q; /archives//html/Amps/2003-03/msg00281.html (10,914 bytes)
50. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Thu Mar 6 22:30:16 2003; LSB about There sure is a difference! I have to be very careful doing two-tone receiver tests to make sure the levels are equal, otherwise one 3rd order product will be much stronger than the other.; /archives//html/Amps/2003-03/msg00282.html (10,416 bytes)
51. [Amps] Arcing (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Fri Mar 7 06:33:29 2003; Anyone checking a power transformer with a high-current ohmmeter knows this effect well. When you pull the meter leads, you are lucky of you don't blow the meter out or get knocked on your rear! Ford; /archives//html/Amps/2003-03/msg00292.html (8,903 bytes)
52. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Fri Mar 7 12:52:15 2003; Every test method has some flaws. The key is picking the most meaningful and least problematic test method. The rules are pretty simple. We are not allowed to cause harmful keyclick or splatter inte; /archives//html/Amps/2003-03/msg00303.html (11,246 bytes)
53. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Fri Mar 7 12:52:37 2003; Every test method has some flaws. The key is picking the most meaningful and least problematic test method. The rules are pretty simple. We are not allowed to cause harmful keyclick or splatter inte; /archives//html/Amps/2003-03/msg00304.html (11,250 bytes)
54. [Amps] Arcing (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Fri Mar 7 13:08:29 2003; a I This is a different situation than the flyback or energy storage situation I outlined Jeff, because it probably was a sinewave source causing a time-varying flux that did not result in an abrupt; /archives//html/Amps/2003-03/msg00305.html (9,154 bytes)
55. [Amps] Why hasn't solid state replaced tubes? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sat Mar 8 07:07:35 2003; ......and you must have a reasonable S/N ratio to start with and know how to use a receiver to do a proper test. I can think of a specific example... A KB3 on 160m who is about 20 over 9 here has tr; /archives//html/Amps/2003-03/msg00324.html (10,449 bytes)
56. [Amps] Arcing (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sat Mar 8 07:13:16 2003; As I said before when it is a sinewave there is no transient or energy storage and release, unlike the case when something abruptly switches off allowing fields to collapse. But I'm sure you know th; /archives//html/Amps/2003-03/msg00325.html (7,891 bytes)
57. [Amps] 4CX1600B vs. GU84B (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sat Mar 8 09:06:59 2003; I have several new 4CX1600 tubes. I will trade one or more of them for some nice old decent boat anchor gear. 73 Tom; /archives//html/Amps/2003-03/msg00333.html (7,000 bytes)
58. [Amps] Ameritron AL-80B - Alternative? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 05:35:58 2003; Rod, What were the code dates of the failed tubes?? That is a four digit number like 9838 which means 38th week of 1998. There is no parasitic problem and inrush problem. First, it is technically im; /archives//html/Amps/2003-03/msg00355.html (10,531 bytes)
59. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 05:58:30 2003; What you all seem to miss is it is physically impossible for a parasitic to cause a G-K short in a tube by bending the filament, so why would an oscillation (even if it occurred) be an issue??? The; /archives//html/Amps/2003-03/msg00357.html (9,941 bytes)
60. [Amps] Nichrome magic (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 06:03:23 2003; How soon we forget things like that. Lowering operating frequency Q, which is what nichrome does, will reduce the tendency for sharp tuning. It just doesn't do much for VHF operation. 73 Tom; /archives//html/Amps/2003-03/msg00358.html (9,317 bytes)

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