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1. [AMPS] Coil Forms (score: 1): Author: zl1aih@ihug.co.nz (zl1aih@ihug.co.nz); Date: Fri, 7 Dec 2001 21:35:24 +1300; 73 Peter G3RZP> Yes, there are still quite a few here in ZL. My next project (which should keep me out of mischief for a year or two) is a separate amplifier for each HF band for CW contesting. (the; /archives//html/Amps/2001-12/msg00157.html (8,332 bytes)
2. [AMPS] Coil Forms (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 7 Dec 2001 08:53:34 -0000; --Original Message-- From: zl1aih@ihug.co.nz <zl1aih@ihug.co.nz> To: amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 07 December 2001 08:37 Subject: RE: [AMPS] Coil Forms sn; /archives//html/Amps/2001-12/msg00158.html (6,908 bytes)
3. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 12 Nov 2001 10:42:06 -0000; PVC isn't the best material for the job: if you can get some fibreglass, that's much better - less loss. I never throw out old (dead) tubes until the bases have been taken off.......I've got a number; /archives//html/Amps/2001-11/msg00179.html (8,171 bytes)
4. [AMPS] Coil Forms (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 12 Nov 2001 12:33:29 -0000; with One of the clock spares suppliers I use sells mercury for barometers and pendulums etc. They sell spillage power - 1:1 mix of flowers of sulpher and calcium hyroxide. www.medmaw.com Steve -- FAQ; /archives//html/Amps/2001-11/msg00180.html (8,406 bytes)
5. [AMPS] Coil Forms (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 12 Nov 2001 08:10:31 -0500; The loss difference is generally insignificant, because the primary field in the PVC is the magnetic field unless you are unwisely placing PVC where the electric field is highly concentrated. By far; /archives//html/Amps/2001-11/msg00181.html (8,199 bytes)
6. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 12 Nov 2001 13:16:23 -0000; I've come across some black PVC tube that was conductive, so using that wouldn't be a good idea..... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com; /archives//html/Amps/2001-11/msg00183.html (7,982 bytes)
7. [AMPS] Coil Forms (score: 1): Author: 2@vc.net (2); Date: Mon, 12 Nov 2001 05:34:39 -0800; ABS has a lower Dissipation factor than PVC . G10 and G11 epoxy-fiberglass have a low D factor. Source of G10 and G11 tubing: Plastifab,1425 Palomares, La Verne, CA 91750 818 967 9376. Such tubing i; /archives//html/Amps/2001-11/msg00184.html (8,352 bytes)
8. [AMPS] Coil Forms (score: 1): Author: 2@vc.net (2); Date: Mon, 12 Nov 2001 05:46:50 -0800; / So for QRP, PVC is good enough. For QRO, maybe not. In my experiences with the 8170 20db amplifier (a.k.a. the "Plywood Box"), white PVC ignited and burned. - R. L. Measures, 805.386.3734,AG6K, ww; /archives//html/Amps/2001-11/msg00186.html (9,206 bytes)
9. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 12 Nov 2001 13:39:18 -0000; Around the Dayton flea market, you can still find the original 1-1/4 inch diameter 4 and 5 pin forms made by Hammarlund et al, usually stuffed in a box under the table. When I get around to it, I'm i; /archives//html/Amps/2001-11/msg00187.html (8,526 bytes)
10. [AMPS] Coil Forms (score: 1): Author: MM@plextek.co.uk (Mark Marsden); Date: Mon, 12 Nov 2001 14:08:41 +0000; Hi guys What are the plastic ribs on B&W coil stock made of? (I'm looking for different mounting methods for ATU coils and a 4CX1000A linear Pi-Tank.) Also what's the best (readily available) materia; /archives//html/Amps/2001-11/msg00188.html (9,809 bytes)
11. [AMPS] Coil Forms (score: 1): Author: 2@vc.net (2); Date: Mon, 12 Nov 2001 06:47:34 -0800; Epoxy-fiberglass tubing works well at 9kV and 14kW. HV-RFCs are covered in Part 4 of "Amplifiers" on my Web site. cheers, Mark - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ; /archives//html/Amps/2001-11/msg00192.html (8,910 bytes)
12. [AMPS] Coil Forms (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Mon, 12 Nov 2001 09:00:09 -0600; Polystyrene rod, heated until it flows into the coil. Effective for QRP, sometimes given to flowing in QRO. You might consider pre-made porcelain coil forms, or custom make your own -- it's not part; /archives//html/Amps/2001-11/msg00194.html (8,782 bytes)
13. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 12 Nov 2001 15:39:39 -0000; At one time (some 30 years ago) there was a company in the UK called Codar, who made coil stock like B & W. they did move to a higher temperature material than polystyrene - from memory, I think it w; /archives//html/Amps/2001-11/msg00195.html (9,618 bytes)
14. [AMPS] Coil Forms (score: 1): Author: kc5vdj@yahoo.com (Jim Bryant); Date: Mon, 12 Nov 2001 15:38:01 -0600; Antique Electronic Supply, www.tubesandmore.com, also sells these tube bases. Don't go destroying tubes for these unless you have verified their death on a calibrated tube tester of adequate quality; /archives//html/Amps/2001-11/msg00207.html (9,950 bytes)
15. [AMPS] Coil Forms (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 12 Nov 2001 19:43:48 -0800; I ran a program written by K6STI, which computes coil losses and the results are interesting. Using 28 mhz, the highest frequency of the normal amp, I looked at a 4 turn coil made of #14 wire with 4; /archives//html/Amps/2001-11/msg00209.html (9,223 bytes)
16. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 13 Nov 2001 07:35:23 -0000; etc] You don't need a tube tester to find an open circuit filament/heater, or shorts present when cold. Blue glow in the space between electrodes is a pretty good indicator of gas, too. I've never a; /archives//html/Amps/2001-11/msg00213.html (9,194 bytes)
17. [AMPS] Coil Forms (score: 1): Author: kc5vdj@yahoo.com (Jim Bryant); Date: Tue, 13 Nov 2001 02:16:33 -0600; There are tests that you can make without a tester, of course, but honestly, a tube tester is a good investment. The point is that if it works, and has some life left, keep it as a spare, rather than; /archives//html/Amps/2001-11/msg00215.html (10,212 bytes)
18. [AMPS] Coil Forms (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 13 Nov 2001 08:26:13 -0000; Not in my house. For several years, I've had a policy that people throwing tubes away can let me have them, rather than let them go to the dump. People needing a tube can come and get one if I've got; /archives//html/Amps/2001-11/msg00217.html (8,288 bytes)
19. [AMPS] Coil Forms (score: 1): Author: kc5vdj@yahoo.com (Jim Bryant); Date: Tue, 13 Nov 2001 02:27:17 -0600; Oops... Forgot to add something... For the uninitiated, the "blue glow" is not necessarily bad. That being "Bad" is highly dependant on the tube/valve in use. For instance, I have yet to see certain; /archives//html/Amps/2001-11/msg00218.html (11,010 bytes)
20. [AMPS] Coil Forms (score: 1): Author: kc5vdj@yahoo.com (Jim Bryant); Date: Tue, 13 Nov 2001 02:58:37 -0600; KC5VDJ tips his hat to ya! Got any 6U5's or 6G5's? I'm also looking for U-201's/C-301's and U-200's/C-300's [NOT UX or CX]. I can see what I have to trade, but my spares box isn't as well stocked as; /archives//html/Amps/2001-11/msg00219.html (9,599 bytes)

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