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21. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 17 Jan 2014 14:40:01 -0500; There is nothing wrong with that bandswitch at that power and a good thing about the Load cap is that it has several wiper surfaces to handle the current unlike what is in most commercial amps. The s; /archives//html/Amps/2014-01/msg00112.html (11,007 bytes)
22. Re: [Amps] Building an Amp 101 (score: 1): Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>; Date: Fri, 17 Jan 2014 11:45:56 -0800; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2014-01/msg00113.html (8,679 bytes)
23. Re: [Amps] Building an Amp 101 (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 17 Jan 2014 16:49:44 -0500; On 1/17/2014 10:10 AM, Jerry wrote: I have had a long desire to build my own linear HF or VHF amp. I believe I have the electronic technical skills but after looking at some completed projects like t; /archives//html/Amps/2014-01/msg00114.html (13,798 bytes)
24. Re: [Amps] Building an Amp 101 (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Fri, 17 Jan 2014 14:10:04 -0800 (GMT-08:00); One area where home built amplifiers can be substantially better than commercial ones is ease of repair. Many commercial amps are designed to be compact. Even Collins and Alpha can be bears to repair; /archives//html/Amps/2014-01/msg00115.html (8,833 bytes)
25. Re: [Amps] Building an Amp 101 (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 17 Jan 2014 18:47:33 -0500; On 1/17/2014 5:10 PM, Colin Lamb wrote: One area where home built amplifiers can be substantially better than commercial ones is ease of repair. Many commercial amps are designed to be compact. Even; /archives//html/Amps/2014-01/msg00116.html (11,169 bytes)
26. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill <dezrat1242@wildblue.net>; Date: Fri, 17 Jan 2014 15:54:25 -0800; On 01/17/2014 09:51 AM, Mike Waters wrote: The output loading capacitor only has to handle about 300 volts. Not so. Capacitors arc at the peak voltage, not the RMS, and with 1500 watts into 1:1 SWR a; /archives//html/Amps/2014-01/msg00117.html (8,652 bytes)
27. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill <dezrat1242@wildblue.net>; Date: Fri, 17 Jan 2014 15:59:22 -0800; Good point, Colin. Couldn't agree more. 73, Bill W6WRT On 01/17/2014 02:10 PM, Colin Lamb wrote: One area where home built amplifiers can be substantially better than commercial ones is ease of repai; /archives//html/Amps/2014-01/msg00118.html (8,678 bytes)
28. Re: [Amps] Building an Amp 101 (score: 1): Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>; Date: Fri, 17 Jan 2014 16:23:06 -0800; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2014-01/msg00119.html (8,084 bytes)
29. Re: [Amps] Building an Amp 101 (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Fri, 17 Jan 2014 18:40:35 -0700; Jerry, Let me join the chorus of well-wishers in the group encouraging you to take the plunge! It's very satisfying to build your own QRO amplifier, and I think you'd find it to be enormously educati; /archives//html/Amps/2014-01/msg00120.html (12,576 bytes)
30. Re: [Amps] Building an Amp 101 (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Fri, 17 Jan 2014 21:54:25 -0800; Here is a picture that shows the bandswitch contacts: <http://www.qsl.net/k2vco/4CX1000A/Chassis.jpg> The fixed contacts are about 3/8" in diameter. The rotor is made of several leaves, and makes con; /archives//html/Amps/2014-01/msg00121.html (9,250 bytes)
31. Re: [Amps] Building an Amp 101 (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 18 Jan 2014 08:44:54 +0100; Although a good sized shear is nice, you do need to watch the Chinese ones. Mine came with no guard so you could slide the metal sheet in and then your fingers. Having stood on the treadle with one f; /archives//html/Amps/2014-01/msg00122.html (8,736 bytes)
32. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 03:52:08 -0800; It might handle the current but the spacing is too small for a proper voltage rating. It should be about four inches in diameter and if bought new should cost between $300-$400. Check out these: http; /archives//html/Amps/2014-01/msg00123.html (9,098 bytes)
33. Re: [Amps] Building an Amp 101 (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 18 Jan 2014 08:41:10 -0700; Re Model 86 vs. Model 88 bandswitches: I used a model 86 on my homebrew 8877 amp (4700V on the plate), but after flashing it over, I upgraded to a model 88. With a six position bandswitch, the model; /archives//html/Amps/2014-01/msg00124.html (10,856 bytes)
34. Re: [Amps] Building an Amp 101 (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sat, 18 Jan 2014 10:52:30 -0500; Why not use relays appropriate for the switching duty? Then the bandswitch can be just about anything or even remotely controlled. Plus you can locate the switch where it's convenient to operate inst; /archives//html/Amps/2014-01/msg00125.html (11,545 bytes)
35. Re: [Amps] Building an Amp 101 (score: 1): Author: Jim W7RY <w7ry@centurytel.net>; Date: Sat, 18 Jan 2014 09:06:28 -0800; Bill... It works fine. Why is this a problem for you? Why are you dictating to Vic what he SHOULD use? I (and I'm sure others) get a little tired of your heavy handedness. Just because your the moder; /archives//html/Amps/2014-01/msg00129.html (10,702 bytes)
36. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 09:32:19 -0800; It works fine. Why is this a problem for you? Why are you dictating to Vic what he SHOULD use? I (and I'm sure others) get a little tired of your heavy handedness. Just because your the moderator, do; /archives//html/Amps/2014-01/msg00131.html (9,559 bytes)
37. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 18 Jan 2014 12:35:17 -0500; That switch is an old Radioswitch and has no problem with power or voltage. All the senior Ameritrons have always used the same Centralab JV-9000 series switch (now Electroswitch) as the Alphas excep; /archives//html/Amps/2014-01/msg00132.html (11,329 bytes)
38. Re: [Amps] Building an Amp 101 (score: 1): Author: Jim W7RY <w7ry@centurytel.net>; Date: Sat, 18 Jan 2014 09:45:33 -0800; Oh.. you must be the moderator on another list I'm on. 73 Jim W7RY It works fine. Why is this a problem for you? Why are you dictating to Vic what he SHOULD use? I (and I'm sure others) get a little; /archives//html/Amps/2014-01/msg00133.html (10,129 bytes)
39. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 09:50:21 -0800; ORIGINAL MESSAGE: (may be snipped) Carl KM1H REPLY: I design conservatively. Anyone who thinks that switch is adequate probably rides a motorcycle at full freeway speeds in heave traffic and thinks t; /archives//html/Amps/2014-01/msg00134.html (9,228 bytes)
40. Re: [Amps] Building an Amp 101 (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Sat, 18 Jan 2014 10:52:31 -0700; Hi Colin, I agree that one shouldn't leave the unused segments of of a tank coil completely floating, and I don't do that. As you suggest, I connect the wiper on the bandswitch to the cold (antenna); /archives//html/Amps/2014-01/msg00135.html (12,612 bytes)

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