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1. [AMPS] Re: Filament Xfmr. (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sun, 3 Oct 1999 11:39:29 -0500; About: "I am building an amp with four 3-500Z using low bands only (160 and 80m). I do have two filament transformers, 5V/80A w/o a center tap on the secondary coil. The other one contains four coils; /archives//html/Amps/1999-10/msg00062.html (8,312 bytes)
2. [AMPS] Re: Filament Xfmr. (score: 1): Author: Jim" <jdc@ieway.com (Jim); Date: Sun, 3 Oct 1999 10:17:14 -0700; Henry radio runs the filaments in their amplifiers with the filaments in series. There is no center tap on their filament transformers. They use a small choke hooked to the "center" of the 2 tubes. T; /archives//html/Amps/1999-10/msg00063.html (9,845 bytes)
3. [AMPS] Re: Filament Xfmr. (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 3 Oct 1999 22:16:33 -0700; If you nean to HV negative, ok. You can also construct a 5v/60Hz center-tap choke/auto-trans on a high-mu ferrite core. It does double duty by carrying the cathode current to HV neg. - later, Roy. -; /archives//html/Amps/1999-10/msg00065.html (8,470 bytes)
4. [AMPS] Re: Filament Xfmr. (score: 1): Author: w7iuv@axtek.com (Larry Molitor); Date: Sun, 03 Oct 1999 19:37:33 +0100; I use a small filament transformer with a secondary center tap. Connect the secondary across the big transformer secondary. Leave the primary open. Use the small transformer secondary center tap for; /archives//html/Amps/1999-10/msg00071.html (9,096 bytes)
5. [AMPS] Re: Filament Xfmr. (score: 1): Author: measures@vcnet.com (measures); Date: Mon, 4 Oct 1999 01:25:52 -0700; Indeed, Jim, and there is no audible hum. Kenwood's TL-922 does the same. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@con; /archives//html/Amps/1999-10/msg00072.html (8,191 bytes)
6. [AMPS] Re: Filament Xfmr. (score: 1): Author: aa6eg@hh.tmx.com (Pat Barthelow); Date: Sun, 3 Oct 1999 19:02:45 -0700 (PDT); Hi Larry, Why would you want 4 x 3-500Zs? Two will do max legal power nicely... 73, DX, de Pat, AA6EG/N6IJ; aa6eg@hh.tmx.com;n6ij@hotmail.com 599 DX Drive, Marina CA 93933 See us on the web: www.polk; /archives//html/Amps/1999-10/msg00075.html (10,269 bytes)
7. [AMPS] Re: Filament Xfmr. (score: 1): Author: vk6apk@eon.net.au (Alek Petkovic); Date: Mon, 04 Oct 1999 20:09:57 +0800; Hi Pat, The answer to your question is Economics. Running legal power with 4 tubes rather than 2, means you would probably never need to buy replacement tubes. 4 tubes should give a lifetime of servi; /archives//html/Amps/1999-10/msg00095.html (11,401 bytes)
8. [AMPS] Re: Filament Xfmr. (score: 1): Author: wsz@ginko.de (Werner S. Zielke, DJ2HZ); Date: Mon, 04 Oct 1999 13:19:01 +0200; Sure, two of the 3-500Zs will produce legal power. Under normal cndx never you'll need any signal amplfication. I'm interested on technics, experiments, constructions and homebrewing. I guess that is; /archives//html/Amps/1999-10/msg00096.html (11,404 bytes)
9. [AMPS] Re: Filament Xfmr. (score: 1): Author: w7iuv@axtek.com (Larry Molitor); Date: Mon, 04 Oct 1999 22:47:03 +0100; Well, Pat, I don't want them. It was someone else who posted the original question. A tube with handles is the proper way to go about producing illegal power! That is, if someone were so inclined. Ha; /archives//html/Amps/1999-10/msg00159.html (8,445 bytes)
10. [AMPS] Re: Filament Xfmr. (score: 1): Author: aa6eg@hh.tmx.com (Pat Barthelow); Date: Thu, 7 Oct 1999 12:56:57 -0700 (PDT); I just thought a pair of 3-500Zs, properly used, even at full legal output, could also deliver a lifetime of service. My L-4B's 3-500s have been delivering since 1965....in recent years, even in Cont; /archives//html/Amps/1999-10/msg00255.html (12,601 bytes)
11. [AMPS] Re: Filament Xfmr. (score: 1): Author: RFpower@radiodan.com (Radiodan W7RF); Date: Thu, 7 Oct 1999 13:31:21 -0700; Indeed, my HENRY 2K serial number ONE has the original 3-400Z tubes in it from 1963 and still puts out about 1200 watts (about what it did new). Many HENRY 3K or 3K-A (pair 3-500Z) owners routinely g; /archives//html/Amps/1999-10/msg00259.html (15,143 bytes)
12. [AMPS] Re: Filament Xfmr. (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 7 Oct 1999 16:53:15 -0700; ? I know of two 3kAs - within 50 miles of here - that shorted two pairs of new, out of the sealed Eimac box, 3-500Zs in less than one day. . The 3KA has a killer heavy duty supply with no glitch res; /archives//html/Amps/1999-10/msg00267.html (8,816 bytes)

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