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1. [Amps] al80a (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 3 Aug 2002 11:02:33 -0400; 99% of that stuff is just needless folklore originated by people who sell kits. Some people just can't face the fact that tubes fail, and so they "invent" odd reasons to explain a common event. For; /archives//html/Amps/2002-08/msg00034.html (10,008 bytes)
2. [Amps] suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 5 Aug 2002 22:20:35 -0400; Sure, here is how it works. The resistor is the component that mostly dominates the system at higher frequencies, while the inductor dominates at lower frequencies. The reason is the frequency slope; /archives//html/Amps/2002-08/msg00065.html (11,405 bytes)
3. [Amps] 3-400Z vs. 4-400A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 7 Jul 2002 10:39:46 -0400; Better get a new plate tuning capacitor and a new bandswitch while you are getting the new transformer...because the old components won't take an increase in voltage. Watch the little fixed caps and; /archives//html/Amps/2002-07/msg00102.html (10,151 bytes)
4. [Amps] Personal insults. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 9 Jul 2002 09:05:46 -0400; Maybe I'm missing something. I thought they were offering a critique of a web page, at the *request* of the person owning the web page. If someone asks for input, they should appreciate it...shouldn; /archives//html/Amps/2002-07/msg00132.html (7,070 bytes)
5. [Amps] My new Toy. Off Topic & Zippers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 10 Jul 2002 08:40:45 -0400; Two questions and one comment: Is that why you called attention to you web page? Is that why you got upset with the responses from people who looked and commented? Spelling and grammatical errors in; /archives//html/Amps/2002-07/msg00145.html (8,645 bytes)
6. [Amps] My new Toy. Off Topic & Zippers. Final. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Jul 2002 06:06:58 -0400; Hi Alex, That's where you are incorrect Alex. You are confusing power factor correction or resonance with conjugate matching. They are two very different things!! To achieve resonance or correct powe; /archives//html/Amps/2002-07/msg00149.html (10,310 bytes)
7. [Amps] Conjugate matching and resonance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Jul 2002 02:24:26 -0400; Good points Bill, I thought about that, but decided it might be too complicated to get into waveshape with Alex until we got past the misunderstanding of resonance and conjugate matching. I felt it; /archives//html/Amps/2002-07/msg00155.html (8,970 bytes)
8. [Amps] Defective 8877's ? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Jul 2002 17:43:31 -0400; 8877's have been problems off and on over the years. The worse period was in the middle eighties, when for long periods of time the failure rate was extremely high. 8877 tubes got very good after Sa; /archives//html/Amps/2002-07/msg00165.html (7,146 bytes)
9. [Amps] Mica Capacitors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 14 Jul 2002 12:23:02 -0400; The mica caps used in old sets like that are very good RF capacitors. They are conservatively rated, so you can push them over the rating by a reasonable margin. You probably are safe up to about 30; /archives//html/Amps/2002-07/msg00185.html (7,275 bytes)
10. [Amps] Al-80a problem. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Jul 2002 22:48:56 -0400; Look in the manual. Although I designed that amp and managed the company that built those meters, I can't recall the exact meter resistances. I think they are 450 ohms, and if that is correct the re; /archives//html/Amps/2002-07/msg00210.html (8,433 bytes)
11. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Jul 2002 10:30:19 -0400; Hi Doug, You should have enough headroom. That's only .8^2 * 5.6= 3.6 watts per diode. Maybe the heatsink is too small, or mounting is incorrect. You know diodes can run pretty hot and remain safe.; /archives//html/Amps/2002-07/msg00244.html (9,581 bytes)
12. [Amps] KW Linear for FT-817 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Jul 2002 10:30:18 -0400; He might want to look at the IM performance of that transmitter before using it to generate a KW. I sortof remember it as not being good, although I might be mistaken. 73, Tom W8JI W8JI@contesting.c; /archives//html/Amps/2002-07/msg00245.html (9,069 bytes)
13. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Jul 2002 20:59:59 -0400; Woops. Shouldn't be a square in there. .8 times 5.6 at about 4.5W is correct. 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-07/msg00277.html (8,967 bytes)
14. [Amps] Bias Zener Diodes In Parallel ?++ (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 19 Jul 2002 22:45:41 -0400; Hi Alex, You can not properly cathode modulate a linear triode by varying bias. First... any modulated stage has to be heavily into in class C in order to have linear modulation. You can't modulate i; /archives//html/Amps/2002-07/msg00347.html (9,718 bytes)
15. [Amps] 2.25 to 1 toroid winding information sources (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 21 Jul 2002 20:19:30 -0400; Impedance ratio, in a lossless transformer, is the square of the turns ratio. So you'd need a 1.5:1 turns ratio, which could only be accomplished with a 3:2 ratio or higher multiple since 1/2 turns; /archives//html/Amps/2002-07/msg00388.html (7,528 bytes)
16. [Amps] Muffin Fans and hot exhaust (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 21 Jul 2002 20:19:29 -0400; Fans and blowers work significantly better when pressurizing another fan, rather than "pulling air" after it goes through a restriction. Very few fans or blowers like to have hot inlet air, or to be; /archives//html/Amps/2002-07/msg00389.html (8,259 bytes)
17. [Amps] Muffin Fans and hot exhaust (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Jul 2002 21:19:01 -0400; Assuming the motor can take it, motors with start/run windings can be damaged when operated at low voltage, the only problem is instability in the fan speed. A fan motor will wander around in speed; /archives//html/Amps/2002-07/msg00405.html (9,530 bytes)
18. [Amps] Muffin Fans and hot exhaust (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Jul 2002 21:19:00 -0400; First, the difference between a fan and a blower is in the construction. Fans have blades that work by pushing air with a small pressure drop, blowers generally are centrifugal that spin an impeller.; /archives//html/Amps/2002-07/msg00406.html (11,606 bytes)
19. [Amps] 2.25 to 1 toroid winding information sources (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Jul 2002 06:06:30 -0400; How can you make a combination of transmission lines that are parallel at one end and in series at the other that come out to 2.25:1 ratio? Whatever transformer is used, it has to be an autotransfor; /archives//html/Amps/2002-07/msg00415.html (7,605 bytes)
20. [Amps] Muffin Fans and hot exhaust/2 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Jul 2002 06:06:31 -0400; Three fans and a microprocessor to cool one heatsink and one transformer. Talk about exaggeration! So would a single fan with no CPU. In fact most noise is caused by bearings in the fan, turbulence; /archives//html/Amps/2002-07/msg00416.html (10,112 bytes)

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