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1. [Amps] Pole Pig Questions (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 15 Aug 2006 10:08:44 -0700 (PDT); Transformer Gurus: I have an old Westinghouse Hypersil Pole xformer and have a couple of questions about it. Here are the specs: 12470/7200 volts to 120/240. 3KV-A Continuous. Weighs 49 lbs out of ca; /archives//html/Amps/2006-08/msg00512.html (7,026 bytes)
2. [Amps] Bad Tubes (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Fri, 29 Sep 2006 10:24:52 -0700 (PDT); I tend to agree with Larry on this issue. We are starting to see the end of the supply of "good" usuable 4CX800's and are dipping into the dregs, rejects, etc. I had a chance to speak with W0MOM at t; /archives//html/Amps/2006-09/msg00365.html (8,010 bytes)
3. [Amps] 11 Meter lockout (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 12 Oct 2006 09:48:03 -0700 (PDT); Molly W0MOM of Alpha explained that the CB lockout feature is already a fact in the microprocessor controlled 87A. She related a story at the W9DXCC meeting of an person who bought an 87 and complain; /archives//html/Amps/2006-10/msg00092.html (6,719 bytes)
4. [Amps] 8877 vs GS-35B (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sun, 22 Oct 2006 10:06:40 -0700 (PDT); There is another BIG difference between the two. The GS-35B is no longer being made. When will the supply run dry? The 8877 is still in production and with commercial broadcast use, will probably be; /archives//html/Amps/2006-10/msg00234.html (6,942 bytes)
5. [Amps] YC-257 VS 8877 (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 17 Jan 2007 19:06:38 -0800 (PST); There is o significant difference worth mentioning. The filament voltage of the 3CPX1500A7 is specified by Eimac to br 5.5 volts at 11.2 A while the 8877 is specified at 5.0 volts at 10.5 A. If the a; /archives//html/Amps/2007-01/msg00182.html (7,085 bytes)
6. Re: [Amps] 813 Fil Xformer (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 24 Jan 2007 09:22:18 -0800 (PST); Steve: Another approach is to wire the two filaments in series (the TL-922 does this I believe). Then you could use 24 volt xformer drawing current equal to one tube. Put a resistor in the primary le; /archives//html/Amps/2007-01/msg00247.html (6,364 bytes)
7. Re: [Amps] Postal Rates (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sat, 28 Apr 2007 13:37:15 -0700 (PDT); Not only that, I was told by two clerks in two different Post Offices, that IRC's will not be sold or accepted after May 14! Sorry for the off topic post. W0JX -- Ahhh...imagining that irresistible "; /archives//html/Amps/2007-04/msg00358.html (6,313 bytes)
8. [Amps] 4-400 Amp (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 14 Jun 2007 18:08:56 -0700 (PDT); Andre: Go to www.W7IUV.com and look at Larry's 3 tube, 4-400 GG amp for 40 meters. You will get lots of good ideas from that. Larry directly grounds the grids to the chassis. The rest is very straigh; /archives//html/Amps/2007-06/msg00089.html (6,356 bytes)
9. [Amps] Vertex_Yaesu Merger (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Mon, 5 Nov 2007 18:15:47 -0800 (PST); If this merger goes through, it will be the end of Yaesu as we know it. I know many hams who work for Motorola in Illinois. Employees are generally demoralized from cut after cut. Just look at Motoro; /archives//html/Amps/2007-11/msg00066.html (7,127 bytes)
10. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 2 Jan 2008 10:34:27 -0800 (PST); I agree that the parallel, voltage equalizing resistors are unnecessart however, I am not so sure about the bypass capacitors (usually .01). Some believe that the capacitors are necessary to supress; /archives//html/Amps/2008-01/msg00016.html (6,831 bytes)
11. [Amps] 160-6 Amp (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 8 Jan 2008 14:43:04 -0800 (PST); Take a look at K5AM's 4CX1000A amp, built in the 80's, I think. Key elements of the design include a passive, grid driven design which eliminates much of the input circuit. But for this you are looki; /archives//html/Amps/2008-01/msg00078.html (6,455 bytes)
12. [Amps] Model 86 Bandswitches (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 31 Jan 2008 16:24:42 -0800 (PST); Anyone out there have any tips on how to get the pins out of the rotor and shafts of old RF Switch/Multitech band switches without wrecking them? 73, Dennis W0JX -- Be a better friend, newshound, and; /archives//html/Amps/2008-01/msg00279.html (6,326 bytes)
13. Re: [Amps] New Amps at Dayton (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 20 May 2008 06:42:10 -0700 (PDT); The only thing that I saw at Dayton worth noting is a change in the current Alpha 8100. The finals have been replaced with TWO 4CX1000A's instead of the 4CX800A7's and the amp has been relabeled eith; /archives//html/Amps/2008-05/msg00126.html (6,816 bytes)
14. Re: [Amps] Alpha 8410 (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 20 May 2008 07:46:15 -0700 (PDT); Forgot to add this. If you send your 8100 back to Alpha, they have a program to upgrade the amp to the 4CX1000's. Did not get the price of the "upgrade." Note the increase in plate dissipation capaci; /archives//html/Amps/2008-05/msg00129.html (6,359 bytes)
15. Re: [Amps] Availability of GS-35B (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 22 May 2008 06:02:51 -0700 (PDT); The GS-35B has not been made for years. All inventory is NOS. It likes high voltage but not too high. 3500-3600 is ideal @800 ma. 73, Dennis W0JX/8 _______________________________________________ Amp; /archives//html/Amps/2008-05/msg00165.html (6,360 bytes)
16. [Amps] Harback_Dahl HV Transformer (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sun, 15 Jun 2008 16:09:51 -0700 (PDT); Straight from Jeff Weinberg, W8CQ, in the flea market at Dayton 08: Jeff told me that he intends to put in winding equipment here in Ohio and wind his own transformers using Peter Dahl's designs. Rig; /archives//html/Amps/2008-06/msg00116.html (6,833 bytes)
17. [Amps] 3CPX800A7 Pulls (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sun, 22 Jun 2008 06:23:31 -0700 (PDT); Dave: CTR Surplus usually has a big supply of MRI/CT pulls of various date codes. He guarantees that they are good. Has some on Ebay right now. See the following link: http://cgi.ebay.com/Used-Eimac-; /archives//html/Amps/2008-06/msg00173.html (7,053 bytes)
18. [Amps] Silicone chimneys (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 24 Jun 2008 07:50:27 -0700 (PDT); For external anode tubes, I use aircraft grade red silicone baffle material. It comes in 9 foot rolls x 3 inches wide and is 1/8 in thick. It can handle up to 550 degrees F. Current price is $32.95 p; /archives//html/Amps/2008-06/msg00211.html (6,628 bytes)
19. [Amps] SB220 160 Mod (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 30 Jul 2008 19:07:08 -0700 (PDT); Mike, before you do your mod check out Rich Measures, AG6K website. He has a great modification for the SB-220 to 160. You do not have to change or add to the filament choke. You can "tune" it to 16; /archives//html/Amps/2008-07/msg00361.html (6,921 bytes)
20. Re: [Amps] 8877 tests (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 31 Jul 2008 08:51:46 -0700 (PDT); If/when you build that amp be sure to put a glitch resistor in series with the anode supply to the tube. Old 8877's can get gassy. I cooked my Ebay 8877 for three days with only filament voltage and; /archives//html/Amps/2008-07/msg00369.html (6,635 bytes)

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