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281. [AMPS] Alpha 86 pin diode upgrade (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 May 2001 07:54:33 -0400; The original diode was an exceptional diode. Long carrier lifetime with high voltage rating....yet cheap. Ameritron used to use them also, but I used two diodes cathode-to-cathode in series...with 4; /archives//html/Amps/2001-05/msg00022.html (7,603 bytes)
282. [AMPS] SB 220 on 6 meter (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 May 2001 12:27:52 -0400; Group delay in the RF chain is very small, so ALC should work well from an external PA if the system is designed correctly. The problem is the radios. The response time of external ALC ports is gene; /archives//html/Amps/2001-05/msg00027.html (8,190 bytes)
283. [AMPS] ALC (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 2 May 2001 22:29:23 -0400; My 706 makes around 150 watts or so with a 15 volt supply. It has less overshoot at less supply voltage...but always a lot more than the set power and it varies from band to band of course. It short; /archives//html/Amps/2001-05/msg00039.html (7,705 bytes)
284. [AMPS] cathode driven 3-1000z (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 6 May 2001 21:41:04 -0400; What useful information does a grid dip meter give you Skip? Maybe you can explain what to look for, and why it is important. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/2001-05/msg00091.html (6,883 bytes)
285. [AMPS] Self oscillation with homebrew 3-1000Z ???? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 6 May 2001 21:41:04 -0400; Is this ten meters ONLY? Could be many things. How long are the leads from the anode to the tuning cap? Is the tuning cap mounted to the same sheetmetal as the tube grid is grounded to? Is the loadin; /archives//html/Amps/2001-05/msg00092.html (9,254 bytes)
286. [AMPS] Self oscillation with homebrew 3-1000Z ???? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 7 May 2001 16:19:20 -0400; It is also bad advice. The lowest Rp suppressor would be a direct short circuit. So what Rich is saying, in effect, is to not use any suppressor at all. That would be the lowest possible Rp. That is; /archives//html/Amps/2001-05/msg00107.html (9,446 bytes)
287. [AMPS] Self oscillation with homebrew 3-1000Z ???? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 7 May 2001 22:54:30 -0400; I think the problem is he never described the construction in any detail that would give a clue what to do. It might be something as simple as grid lead lengths, or it could be the suppressor or any; /archives//html/Amps/2001-05/msg00111.html (9,422 bytes)
288. [AMPS] chimenys (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 8 May 2001 15:22:26 -0400; Ameritron has a custom chimney built a similar way with high temperature glass, and it is likely a fraction of the price. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FA; /archives//html/Amps/2001-05/msg00126.html (6,994 bytes)
289. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 9 May 2001 05:17:25 -0400; Is there an antenna relay? What type? BTW, you get a lower impedance driving the filament if you split the two .01 capacitors to a common point and feed it there, instead of having one across the fi; /archives//html/Amps/2001-05/msg00132.html (10,876 bytes)
290. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 9 May 2001 20:08:25 -0400; So much for the "magic" of nichrome. The anode is loaded with nichrome, and it is oscillating. Might be a good idea, this doesn't usually change stability much because the feedback mostly involves th; /archives//html/Amps/2001-05/msg00145.html (10,434 bytes)
291. [AMPS] Filament supply? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 9 May 2001 20:28:55 -0400; Thermal lag and balance. The filament (and cathode) does not have time to change temperature. Emission level is constant. A directly heated filament can be balanced so the ac component caused by vol; /archives//html/Amps/2001-05/msg00147.html (7,112 bytes)
292. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 10 May 2001 14:27:34 -0400; I'm certainly glad Jon reminded you of that important point. Don't feel bad, many people miss that point besides you Dave. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/F; /archives//html/Amps/2001-05/msg00160.html (9,574 bytes)
293. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 10 May 2001 14:27:34 -0400; Gain in a 6AK5 grounded cathode amplifier is much higher than a typical GG amplifier. Isolation of input and output is more important when gain is higher. The problems with oscillations in a power a; /archives//html/Amps/2001-05/msg00161.html (11,486 bytes)
294. [AMPS] AL-80b PROBLEM - ANY IDEAS? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 10 May 2001 20:03:14 -0400; It could be many things. Possible causes are a shorted bypass cap in the filament line, anything on the filament side of the transformer center tap or a wiring problem there. It's very unlikely or n; /archives//html/Amps/2001-05/msg00171.html (7,694 bytes)
295. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 10 May 2001 20:03:14 -0400; Hi Dave, Thank you very much, but you give me too much credit. I think Jon has his own opinions. You're welcome. Side "affects" of what? I guess I missed your question. 73, Tom W8JI W8JI@contesting.c; /archives//html/Amps/2001-05/msg00172.html (9,583 bytes)
296. [AMPS] UPDATE ON 3-1000Z OSCILLATION (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 11 May 2001 11:15:15 -0400; Hi Dave, If you have the ability to determine who is "expert" and who isn't, you must be able to contribute greatly to technical discussions. I certainly hope you decide to contribute to technical d; /archives//html/Amps/2001-05/msg00179.html (9,771 bytes)
297. [AMPS] Conjugate Matching In Class B and C Amplifiers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 11 May 2001 20:38:44 -0400; That is not correct, although it has crept into recent texts. I think that concept comes from taking a Thevenin model literally, as an actual circuit with a dissipative resistance in series with a s; /archives//html/Amps/2001-05/msg00200.html (9,980 bytes)
298. [AMPS] Conjugate Matching In Class B and C Amplifiers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 12 May 2001 00:31:56 -0400; There can be no conjugate match in a non-linear system. Nonlinear in this context means a fractional cycle nonlinearity....not the linearity we normally consider where the output power tracks the in; /archives//html/Amps/2001-05/msg00205.html (16,883 bytes)
299. [AMPS] Conjugate Matching In Class B and C Amplifiers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 13 May 2001 10:15:15 -0400; This is exactly when we get into trouble. The minute we assume anyone always has everything correct and is almost infallible is the moment we can no longer trust our judgment. The ARRL works that wa; /archives//html/Amps/2001-05/msg00235.html (10,106 bytes)
300. [AMPS] Conjugate Matching In Class B and C Amplifiers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 13 May 2001 10:15:15 -0400; Walt isn't advocating anything that hasn't been described for many years in many texts. Walt isn't the one who came up with the idea or description of a conjugate match. The problem occurs because s; /archives//html/Amps/2001-05/msg00236.html (10,343 bytes)

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