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21. Re: [Amps] 5cx1500 amp...STL (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Sun, 4 Jan 2009 13:52:59 -0600; This amp was a HFP-2000D before the conversion it is 10thru 160M with tuned input running class AB1 and I may have the parts you are needing I just need time to do some digging. This amp was built in; /archives//html/Amps/2009-01/msg00033.html (7,676 bytes)
22. [Amps] 4-1000 Amp (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Tue, 20 Jan 2009 08:45:39 -0600; Okay I need direction I am wanting to build a 4-1000 amp I came across several tubes at a good price I have most of what I need now here is my sticking point. I have found several articles on using t; /archives//html/Amps/2009-01/msg00185.html (6,721 bytes)
23. [Amps] SB-220 Bandswitch (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Tue, 10 Feb 2009 12:31:19 -0600; All this 220 talk anyone have the bandswitch for a 220 or a source? Bob,kc0hfl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2009-02/msg00273.html (6,593 bytes)
24. [Amps] Autotuners in Amps (score: 1): Author: <kc0hfl@cox.net>; Date: Wed, 11 Feb 2009 22:25:23 -0500; I seen the new handbook had an amp project using an LDG auto tuner for the tuned input and was curious what the groups thoughts was on this. After some research I came across an add where LDG actuall; /archives//html/Amps/2009-02/msg00344.html (6,924 bytes)
25. [Amps] 833A (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Mon, 2 Mar 2009 00:18:59 -0600; I acquired an 833A RF deck it is a 40/80M deck the only markings that may refer to the design is P.J. 2000 on the front panel. Info is a little scarce on this tube as far as rf amps go any ideas of w; /archives//html/Amps/2009-03/msg00040.html (6,564 bytes)
26. Re: [Amps] 833A (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Mon, 2 Mar 2009 08:55:46 -0600; Thanks Eddy, I will take a look at those years. It may be from there it does have a hand wound plate choke. _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2009-03/msg00047.html (8,424 bytes)
27. Re: [Amps] 833A (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Mon, 2 Mar 2009 09:24:07 -0600; www.mines.uidaho.edu/~glowbugs/tx/Universal%20Amp.pdf Found this article it is grid driven. If the link does'nt work do a Google for a universal three band amplifier 73,Bob __________________________; /archives//html/Amps/2009-03/msg00049.html (10,890 bytes)
28. [Amps] Meter shunt (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Fri, 29 May 2009 10:50:35 -0500; I have a Weston 301 meter 0-100 ma scaled meter and wish to make a shunt to use for screen current in my 4-1000 amp. The screen voltage is 300V I have used the formula RS=RM/(IS/IM) Okay here is what; /archives//html/Amps/2009-05/msg00255.html (6,473 bytes)
29. [Amps] 4-1000 Socket choice (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Tue, 21 Jul 2009 13:29:09 -0500; I found a thread that discussed the Pros/Cons of using the metal over the plastic socket. Some claimed Parasitic problems with the metal socket. I have used the metal in single tube amps with no issu; /archives//html/Amps/2009-07/msg00242.html (6,667 bytes)
30. [Amps] 4-1000A neutralization (score: 1): Author: kc0hfl@cox.net; Date: Thu, 3 Sep 2009 20:30:21 -0400 (EDT); I have completed my 2 tube 4-1000A amp but am experiencing self oscillation when I apply plate voltage. My question is do I need to add a neutralization capacitor in the plate line? I reviewed all th; /archives//html/Amps/2009-09/msg00028.html (6,745 bytes)
31. Re: [Amps] 4-1000A neutralization (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Fri, 4 Sep 2009 09:52:38 -0500; Thanks to all for the replies. I have not measured the frequency of the oscillation as of yet. The sockets I am using are the plastic Eimac and the grid/screen pins are tied to ground using one piece; /archives//html/Amps/2009-09/msg00042.html (11,413 bytes)
32. [Amps] Henry 2K-2 (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Thu, 8 Oct 2009 09:41:22 -0500; Looking for some input on using 3-500Z in the 2k-2 as opposed to the 4-400's The 400's were zero bias and I have heard of folks just putting in the 3-500 without any mods. Any thoughts? Bob _________; /archives//html/Amps/2009-10/msg00139.html (6,244 bytes)
33. [Amps] Looking for yc 156 info (score: 1): Author: <kc0hfl@cox.net>; Date: Wed, 1 Dec 2010 18:40:27 -0500; I am starting another project and am looking for schematics for the yc156 I have searched the net found tons of photos of finished amps looking for a proven schematic. My amp will have 5K Plate volta; /archives//html/Amps/2010-12/msg00002.html (6,433 bytes)
34. [Amps] RF on audio using 374A (score: 1): Author: <kc0hfl@cox.net>; Date: Tue, 13 Sep 2011 10:16:13 -0400; I was told I have RF on my audio when using my 374A so I did the usual checked antenna for common mode tried all the tricks 1:1 balun Ugly balun even swapped out antennas after a week of messing with; /archives//html/Amps/2011-09/msg00063.html (7,641 bytes)
35. Re: [Amps] RF on audio using 374A (score: 1): Author: "kc0hfl" <kc0hfl@cox.net>; Date: Wed, 14 Sep 2011 20:02:03 -0500; I am now convinced the problem is within the Alpha I sent this earlier but it never made it to everyone. A question was asked about which mic connector I am using with the Flex and it is the front co; /archives//html/Amps/2011-09/msg00108.html (11,298 bytes)
36. Re: [Amps] Schematics for 4CX250B GG HF amplifier (score: 1): Author: "kc0hfl" <kc0hfl@cox.net>; Date: Wed, 15 Aug 2012 16:59:02 -0500; http://home.comcast.net/~k7rld/4cx250bamplifier.htm Try the above. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a; /archives//html/Amps/2012-08/msg00225.html (10,523 bytes)

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