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21. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 2 Aug 2010 17:23:28 -0400; I'll have to agree with Larry as some of the highest price amps use a tapped toroid for part of the L section of the Pi-L. Carl KM1H _______________________________________________ Amps mailing list; /archives//html/Amps/2010-08/msg00013.html (9,422 bytes)
22. Re: [Amps] New HF amplifier (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Mon, 02 Aug 2010 16:43:19 -0700; ORIGINAL MESSAGE: REPLY: Air core coils wound with the recommended wire size (ARRL Handbook) are very reliable, high power toroids much less so. I have personally had two output tank toroids arc and; /archives//html/Amps/2010-08/msg00014.html (9,070 bytes)
23. Re: [Amps] New HF amplifier (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 02 Aug 2010 18:54:58 -0600; Jim, Yes the comments hold true period! Flux in any core with shorted turns will cause extra loss with the exception of a type -0 core which has u=1. I have seen shorted turns on a toroid core causin; /archives//html/Amps/2010-08/msg00016.html (10,857 bytes)
24. Re: [Amps] New HF amplifier (score: 1): Author: Jim W7RY <w7ry@inbox.com>; Date: Mon, 2 Aug 2010 17:15:44 -0800; So you're saying Alpha, Ten-Tec, Jim W8ZR, Jerry K8RA and myself are all wrong and their designs don't or wont work? 73 Jim W7RY Jim, Yes the comments hold true period! Flux in any core with shorted; /archives//html/Amps/2010-08/msg00018.html (10,380 bytes)
25. Re: [Amps] New HF amplifier (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 03 Aug 2010 10:11:56 -0700; ORIGINAL MESSAGE: REPLY: Nobody is saying toroids won't work, but they do require some careful engineering and especially testing to be sure they are rugged enough. Air core coils are much more forgi; /archives//html/Amps/2010-08/msg00019.html (8,605 bytes)
26. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 3 Aug 2010 13:57:39 -0400; However the 2 Holer HF-2500 doesnt have that problem which points to an inadequate size core for the DX. I happen to have a 2 holer on the bench right now and it runs fine at 2200W key down and has s; /archives//html/Amps/2010-08/msg00020.html (12,300 bytes)
27. Re: [Amps] New HF amplifier (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Tue, 3 Aug 2010 20:48:24 +0200; No, he is not saying that. 73 Peter So you're saying Alpha, Ten-Tec, Jim W8ZR, Jerry K8RA and myself are all wrong and their designs don't or wont work? ______________________________________________; /archives//html/Amps/2010-08/msg00023.html (8,295 bytes)
28. Re: [Amps] New HF amplifier (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Wed, 4 Aug 2010 17:21:22 -0700 (PDT); "So you're saying Alpha, Ten-Tec, Jim W8ZR, Jerry K8RA and myself are all wrong and their designs don't or wont work?" ummmm, very short and very blunt answer, yes... Longer, more nuanced answer, tho; /archives//html/Amps/2010-08/msg00032.html (8,699 bytes)
29. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 4 Aug 2010 20:51:19 -0400; What is the power difference between this "optimized" design and the original HF-2500 with a tapped single toroid for 80/160 and a shorting switch? Carl KM1H _________________________________________; /archives//html/Amps/2010-08/msg00035.html (9,088 bytes)
30. Re: [Amps] New HF amplifier (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Wed, 4 Aug 2010 20:52:33 -0500; Denny, I believe that was Larry's point also. It's certainly my observation here. Does not take much of that power floating around in the cores to warm those babys up either. :) 73/jeff/ac0c www.ac0c; /archives//html/Amps/2010-08/msg00037.html (9,543 bytes)
31. Re: [Amps] New HF amplifier (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 04 Aug 2010 21:18:11 -0700; ORIGINAL MESSAGE: REPLY: I had a conversation with the fellow at Command about just this question after my HF-2500 (not the DX version) burned up it's second toroid while RTTY contesting on 40 meters; /archives//html/Amps/2010-08/msg00040.html (8,982 bytes)
32. [Amps] New HF amplifier (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Thu, 5 Aug 2010 07:05:29 -0700 (PDT); Palstar bought the rights to produce the Commander line of amplifiers after the owner's health declined... They expected to be able to simply truck the inventory to their shop and resume production,; /archives//html/Amps/2010-08/msg00042.html (8,355 bytes)
33. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 5 Aug 2010 10:59:50 -0400; Ah, that explains it. Why did you eliminate the dual section Tune cap? IMO the dual section was a class act used by Alpha, National and others that made 10-20M tuning a snap. At least Palstar cut out; /archives//html/Amps/2010-08/msg00043.html (10,220 bytes)
34. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 5 Aug 2010 11:02:18 -0400; Correction, delete the Tune cap statement, sorry. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-08/msg00044.html (10,762 bytes)
35. Re: [Amps] New HF amplifier (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Thu, 5 Aug 2010 13:27:13 -0700 (PDT); "Ah, that explains it." Explains what, Carl? That I have a Palstar explains something?! holy smokeezs I also have a Commander built HF2500DX - that I have had to resurrect a couple of times, and like; /archives//html/Amps/2010-08/msg00045.html (8,602 bytes)
36. Re: [Amps] New HF amplifier (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 5 Aug 2010 17:14:58 -0400; I'll try to refresh your memory since it was in my reply. "I did have a small part in the final design of the tank circuit when they Do you remember typing that? Since you have a personal involvement; /archives//html/Amps/2010-08/msg00046.html (10,909 bytes)

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