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References: [ +from:wlfuqu00@pop.uky.edu: 110 ]

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21. [AMPS] Low capacitance filament transformers (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 03 Jan 2001 10:25:10 -0500; Has anyone on the list used low capacitance filament transformers instead of filament chokes in grounded grid amplifiers? 73 Bill wa4lav -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions:; /archives//html/Amps/2001-01/msg00096.html (6,682 bytes)
22. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Tue, 16 Jan 2001 08:56:02 -0500; Now that we are off the subject I'd like to correct one miss conception. Ringing is part of the nature of band pass filtering. As you reduce the band width the rise and fall time of the output increa; /archives//html/Amps/2001-01/msg00377.html (9,873 bytes)
23. [AMPS] Protection in cathode not plate? (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Sat, 20 Jan 2001 19:31:14 -0500; I knew something was bugging me about putting the fuse in the cathode ckt and it just hit me. If someone has already pointed this out forgive me for repeating it. I have not been keeping up with the; /archives//html/Amps/2001-01/msg00533.html (7,549 bytes)
24. [AMPS] Building AMP with four valves in parallel (4-250) -any guidance ? (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Sun, 10 Dec 2000 19:12:52 -0500; I bought a 3-500 amp that another ham tried for some time to get to work. I fired it up and was quite disappointed in the output (very low). The problem was that about a volt was lost across the fila; /archives//html/Amps/2000-12/msg00187.html (10,225 bytes)
25. [AMPS] DC Filaments??? (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 01 Nov 2000 09:07:49 -0500; The amount of current drawn form the cathode has nothing to do with the emission life. In fact the hot cathode produces a cloud of electrons around it and creates a virtual cathode that is about one; /archives//html/Amps/2000-11/msg00004.html (8,421 bytes)
26. [AMPS] New (OLD) tube arrived (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Mon, 13 Nov 2000 11:18:16 -0500; Just received an EIMAC 2000T for my collection. This is a real beauty. Now, I can start on my display of EIMAC triodes starting with the 15E. Now if I could only find a 1500T. As far as the larger on; /archives//html/Amps/2000-11/msg00119.html (7,137 bytes)
27. [AMPS] 240VAC Amplifier Wiring (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Wed, 15 Nov 2000 16:05:47 -0500; Rectifiers followed by a capacitive input filter only draw current during only a small portion of each half cycle. This means that the Peak current is many times the average or RMS . During the charg; /archives//html/Amps/2000-11/msg00172.html (9,719 bytes)
28. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Tue, 28 Nov 2000 10:15:33 -0500; I was thinking that perhaps a simpler approach would be to have a glitch resistor of low wattage (in B+ line) such that if you had an arc over in the tube the resistor would quickly self destruct. If; /archives//html/Amps/2000-11/msg00401.html (9,695 bytes)
29. [AMPS] DC Filaments??? (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Tue, 31 Oct 2000 20:41:49 -0500; This is the same as saying the emission life is related to plate current. I think it is the filament temperature that determines the emission life and that is no different for DC or AC. 73 Bill wa4la; /archives//html/Amps/2000-10/msg00004.html (7,486 bytes)
30. [AMPS] Blown TL922A... What to do? (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Tue, 12 Sep 2000 21:07:18 -0400; I like the idea of modeling the circuit. However, much of the circuit is not considered. People often don't realize that that there are additional inductances due to the current paths thru the chassi; /archives//html/Amps/2000-09/msg00574.html (9,927 bytes)
31. [AMPS] Interesting projects -- All Mode KW Transmitter (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Thu, 14 Sep 2000 09:48:38 -0400; Oh, no!!!! here is the DAF amp discussion again but solid state this time!!!! I am very interested in how this turns out. If the experiment is successful it would support the DAF theory. 73 Bill wa4l; /archives//html/Amps/2000-09/msg00711.html (9,742 bytes)
32. [AMPS] Amp using 833A (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Tue, 19 Sep 2000 08:24:47 -0400; I don't think anyone has done any calculations: I used to run a pair of 250TH's in parallel grounded grid in the 60's. I then did not know that it would n0ot work since the mu was only 37 or so. They; /archives//html/Amps/2000-09/msg00862.html (9,170 bytes)
33. [AMPS] Amperex and Penta Labs (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 20 Sep 2000 08:34:57 -0400; Does anyone know what the deal is with Amperex? You can buy new (just made) Amperex tubes but I can't find the Amperex "company" anywhere via any search engine or directory. Is some one just building; /archives//html/Amps/2000-09/msg00901.html (7,384 bytes)
34. [AMPS] Some tube questions...conversion to H2O cooling (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 20 Sep 2000 12:14:05 -0400; My experience has been that only 1/3 or so of the 4CX250B's that I have found at hamfest have really tested good. I don't know about the FG's. However, the real bargains are the 4X150A/7034. They sel; /archives//html/Amps/2000-09/msg00904.html (9,088 bytes)
35. Fwd: Re: [AMPS] Some tube questions...conversion to H2O cooling (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 20 Sep 2000 14:26:27 -0400; The 4X150's, 4X150A's and 4X150A/7034's are different tubes. The 4X150A/7034 has ceramic base around the pins and glass between the anode and base. Also, it is spec'ed at 250 watts dissipation. Look; /archives//html/Amps/2000-09/msg00914.html (8,805 bytes)
36. [AMPS] Re: [Tube-Swap] Amperex and Penta Labs (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Wed, 20 Sep 2000 15:51:36 -0400; It seems that Covimag in France is making at least some of the tubes marketed under the Amperex brand name. As to who is Amperex or who own's the brand name I don't know. check out: http://www.covima; /archives//html/Amps/2000-09/msg00917.html (7,108 bytes)
37. [AMPS] amperex (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Thu, 21 Sep 2000 13:15:53 -0400; Just got an e-mail the Chairman of Covimag in France. Indeed they are the manufacturer of all Amperex brand vacuum tube products. It took a bit of tracking down but finally found it. http://www.covim; /archives//html/Amps/2000-09/msg00938.html (6,557 bytes)
38. Fwd: Re: [AMPS] RE: Graphite Anodes (score: 1): Author: wlfuqu00@pop.uky.edu (Bill Fuqua); Date: Sun, 24 Sep 2000 20:46:50 -0400; This is curious. Graphite (carbon) chemically reacts with oxygen to produce 2 gasses Carbon Monoxide and Carbon Dioxide. Unlike most metals it does not form oxides on the surface which may later deco; /archives//html/Amps/2000-09/msg00970.html (7,769 bytes)
39. [AMPS] Amp using 833A (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Mon, 25 Sep 2000 13:50:28 -0400; I'll have to disagree here. A single tube neat cut off. This is still the case when they are in parallel. However, in push-pull class AB this non-linearity can be reduced at crossover (near zero-cros; /archives//html/Amps/2000-09/msg00992.html (8,908 bytes)
40. [AMPS] Amateur amps on 11 meters (score: 1): Author: Wlfuqu00@pop.uky.edu (William Fuqua); Date: Tue, 29 Aug 2000 16:52:16 -0400; I feel quite differently about this. First of all CB'er/Freebanders frequently interfere with ham bands by either overdriving their amplifiers or having parasitic oscillations that drift up and down; /archives//html/Amps/2000-08/msg00499.html (10,111 bytes)

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