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41. [AMPS] SB220/SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 24 Nov 1997 09:10:32 +0000; Len, This stuff isn't strange at all. Nearly all amps will arc if driven with modest to high drive power when the tank is undercoupled to the load. The tank has all that energy, and it has to do SOM; /archives//html/Amps/1997-11/msg00337.html (8,758 bytes)
42. [AMPS] SB 220 vice SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 24 Nov 1997 09:10:32 +0000; Hi Steve, You have no idea what the exciter power or other transient conditions were at the time. You could have a relay out of sync, an exciter transient, an antenna fault, or even incorrect loadin; /archives//html/Amps/1997-11/msg00338.html (16,359 bytes)
43. [AMPS] SB220/SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 26 Nov 1997 08:54:56 +0000; Nonsense Rich. You distort everything you hear to support your kit sales. I did tell you very clearly that the 220 had a problem with VLF parasitics on occasion from the parallel tuned circuit in th; /archives//html/Amps/1997-11/msg00361.html (8,909 bytes)
44. [AMPS] Re: resistance (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 26 Nov 1997 10:34:18 +0000; Amen Carl. That's why carbon resistors should NEVER be used in power supplies across electrolytics. Once again VERY true. That is a natural characteristic of the resistor. You have to NEVER run the; /archives//html/Amps/1997-11/msg00362.html (9,608 bytes)
45. [AMPS] Re: resistance (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 26 Nov 1997 10:34:18 +0000; A good saleman never admits anything other than his product or "invention" could be a cure for all ills. The goal is to sell suppressor kits, not help people understand how things work and why thing; /archives//html/Amps/1997-11/msg00363.html (9,153 bytes)
46. [AMPS] The great debate (wasRe: resistance) (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 28 Nov 1997 11:19:50 +0000; Did I say Rich? That's true of any good salesman, from PT barnum to Bill Gates. Every person selling anything as a general rule touts their product as the only cure, and dismisses anything else as m; /archives//html/Amps/1997-11/msg00381.html (8,453 bytes)
47. [AMPS] Triode (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 1 Sep 1997 14:25:11 +0000; To: <amps@contesting.com> I used one on the air years ago Robert, it had 811A or 812 tubes, depending on what I could find. My old IMD tester used a pair of grid driven 8877's (now replaced with FET; /archives//html/Amps/1997-09/msg00009.html (7,264 bytes)
48. [AMPS] CENTURION HELP (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 1 Sep 1997 14:25:11 +0000; To: <amps@contesting.com> On the first page of Eimac's instructions on the USE of the constant current curves (the ones you always refer to....). 73, Tom W8JI -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/1997-09/msg00010.html (8,325 bytes)
49. [AMPS] Parasitic suppressors (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 1 Sep 1997 14:25:12 +0000; To: <amps@contesting.com> The problem is the change from a pure reactance to dominant resistance takes place too slowly Lars. It might work if the parasitic was very widely separated from the operat; /archives//html/Amps/1997-09/msg00011.html (8,142 bytes)
50. [AMPS] SB-220 failure (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 1 Sep 1997 15:02:40 +0000; Probably a gassy tube. Nearly all amplifier problems BLAMED on parasitics are simply gassy tubes. Replace the bad tube and repair the damage. Anything you do to the suppressor won't make a bit of di; /archives//html/Amps/1997-09/msg00013.html (8,223 bytes)
51. [AMPS] Heath SB-230 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 1 Sep 1997 15:02:41 +0000; I looked at the SB-230 for Heathkit, as a contract engineer. The problems the 230 has is: 1.) It has no grid protection circuit, making it possible to easily overdrive and damage the grid. Add a FAS; /archives//html/Amps/1997-09/msg00014.html (9,075 bytes)
52. [AMPS] Parasitic suppressors (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 2 Sep 1997 06:06:42 +0000; To: <amps@contesting.com> To: <amps@contesting.com> -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problem; /archives//html/Amps/1997-09/msg00027.html (8,386 bytes)
53. [AMPS] perfect amplifiers (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 2 Sep 1997 14:24:16 +0000; To: <amps@contesting.com> You have missed NOTHING. Totally untrue. That claim comes from the mistaken assumption a PA's source resistance is a dissipative resistance. That is true for a class A pa,; /archives//html/Amps/1997-09/msg00032.html (10,532 bytes)
54. [AMPS] Heath SB-230 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 00:19:09 +0000; To: <amps@contesting.com> The claim it is a "parasitic" is sad, not amusing. The grid dissipation is FIVE watts. Rated grid dissipation is reached at about 60 mA of grid current in the SB-230. Since; /archives//html/Amps/1997-09/msg00034.html (9,829 bytes)
55. [AMPS] conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 09:13:47 +0000; To: <amps@contesting.com> Anything is better than beating one's head against a rock about grid dissipation, hi. It's not new at all Peter. It's the result of the unfortunate selection of the term oh; /archives//html/Amps/1997-09/msg00039.html (10,577 bytes)
56. [AMPS] Silver plating (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 09:13:47 +0000; To: <amps@contesting.com> Two reasons I know of Fraser. 1.) People mistakenly "think" it helps Q at HF and lower VHF. 2.) The plating makes the tank look pretty. Perhaps, but a nice coating of a che; /archives//html/Amps/1997-09/msg00040.html (8,876 bytes)
57. [AMPS] Heath SB-230 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 09:13:47 +0000; To: <amps@contesting.com> Rich replied: It is incorrect to multiply RMS cathode voltage times indicated grid current to find power, since the waveform in the tube is NOT a sine wave. It might be a g; /archives//html/Amps/1997-09/msg00041.html (11,594 bytes)
58. [AMPS] Conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 22:49:39 +0000; To: <amps@contesting.com> The important part is agreeing the Thevenin and Norton models can't be used to desribe anything inside the source, excepot what it looks like at its terminals. I'm not sure; /archives//html/Amps/1997-09/msg00065.html (10,002 bytes)
59. [AMPS] Heath SB-230 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 22:49:39 +0000; Rich claims: Eimac Tube Performance Computer number 5 (detailed instructions) on page 4 in the 1952 and 1967 paper. You can also find it printed on the overlay supplied to use with the curves you so; /archives//html/Amps/1997-09/msg00066.html (9,922 bytes)
60. [AMPS] Heath SB-230 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 22:49:39 +0000; Yes, or normal thermal changes causing the grid and cathode alignment to change. The real people to ask would be at the manufacturer. They probably have some idea what is unreasonable current drift.; /archives//html/Amps/1997-09/msg00067.html (8,882 bytes)

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