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1. [Amps] Variac Question (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Sun, 30 Jan 2005 09:18:02 -0800 (PST); Can I use a General Radio Variac 0-135Volts 20 Amp on one leg of my 230 vac pole pig tranformer in outboard power supply without any trouble ? == Mike-KK4MS a_borg@yahoo.com _________________________; /archives//html/Amps/2005-01/msg00613.html (6,933 bytes)
2. Re: [Amps] Variac Question (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 30 Jan 2005 12:47:19 -0500; Mike, I'm afraid not. There's still 230 Vac flowing through the winding, and its only wound for 115 Vac. It would be the same as putting 230 Vac on a 115 Vac transformers primary, and burn it up. Wil; /archives//html/Amps/2005-01/msg00614.html (7,904 bytes)
3. RE: [Amps] Variac Question (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Sun, 30 Jan 2005 10:55:04 -0800; Mike, I did that for several years and no problems. It gives you the ability to vary primary xfmr voltage between 120 and 240 vac. GL, Dan, N5AR Can I use a General Radio Variac 0-135Volts 20 Amp on; /archives//html/Amps/2005-01/msg00615.html (7,608 bytes)
4. Re: [Amps] Variac Question (score: 1): Author: wb8jkr@juno.com; Date: Sun, 30 Jan 2005 14:01:22 -0500; I've done that. Connect the variac from one side of the 240 line to neutral and the wiper to the primary. You'll be able to adjust from 110 to 220 vac. Mark WB8JKR ___________________________________; /archives//html/Amps/2005-01/msg00616.html (7,882 bytes)
5. Re: [Amps] Variac Question (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 30 Jan 2005 14:13:08 -0500; Is he talking about hooking it across the lines and using the tap on one leg? If so, it would be to much for it. If he puts it in series with one leg where one connection went to the coil, the other; /archives//html/Amps/2005-01/msg00617.html (9,012 bytes)
6. Re: [Amps] Variac Question (score: 1): Author: wb8jkr@juno.com; Date: Sun, 30 Jan 2005 15:09:26 -0500; If he puts it in series with one hot leg it'll act as a current limiting inductive reactance. The main winding needs to be connected from one hot to neutral, and the wiper toward the primary of the s; /archives//html/Amps/2005-01/msg00618.html (10,449 bytes)
7. Re: [Amps] Variac Question (score: 1): Author: TNeill1648@aol.com; Date: Sun, 30 Jan 2005 15:12:53 EST; I have been using an arrangement just like you are describing for 20 years in a 4-1000A amplifier with no problems. The plate voltage can be varied from about 3800 VDC to 7000 VDC. Tom K4XG _________; /archives//html/Amps/2005-01/msg00619.html (7,214 bytes)
8. Re: [Amps] Variac Question (score: 1): Author: "K7RDX" <k7rdx@earthlink.net>; Date: Sun, 30 Jan 2005 15:33:57 -0800; A 115vac variac can be wired in one leg of the 230vac line....The turn on voltage is half of line with variac in lowest position. 73 all,Jim. -- Original Message -- From: "Will Matney" <craxd1@ezwv.c; /archives//html/Amps/2005-01/msg00628.html (9,610 bytes)
9. [Amps] Variac Question (score: 1): Author: Larry <LKIRKLAND@sc.rr.com>; Date: Mon, 02 Feb 2015 15:41:14 -0500; I am building an amp and have started gathering parts for it. My plate transformer secondary is rated at 3500 VAC. Thats a little much for what I need. I need to end up with about 3500 VDC for the am; /archives//html/Amps/2015-02/msg00006.html (7,127 bytes)
10. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 14:58:06 -0600; It sounds like a 115 volt-only Variac, so you can use it between the neutral and one 240V leg. You just connect your 240V plate transformer primary between the Variac wiper and the remaining leg of t; /archives//html/Amps/2015-02/msg00007.html (8,114 bytes)
11. Re: [Amps] Variac Question (score: 1): Author: "Paul Hewitt" <wd7s@earthlink.net>; Date: Mon, 2 Feb 2015 13:38:07 -0800; This works if you have a neutral in the psu but you will be limited to ten amps for the plate transformer primary, pretty thin for most legal limit amps. 73, Paul Paul Hewitt WD7S Productions QRO Hom; /archives//html/Amps/2015-02/msg00008.html (8,627 bytes)
12. Re: [Amps] Variac Question (score: 1): Author: Chuck Curran <ccurran@wi.rr.com>; Date: Mon, 2 Feb 2015 16:19:21 -0600; Hi Larry: You have several alternatives that could work for you, so here is one more. How about a boost/buck transformer wired into your HV transformer primary? You would need approximately a 10 amp; /archives//html/Amps/2015-02/msg00009.html (8,651 bytes)
13. Re: [Amps] Variac Question (score: 1): Author: Larry <LKIRKLAND@sc.rr.com>; Date: Mon, 02 Feb 2015 19:13:44 -0500; Mike, If I understand correctly, to do what you are suggesting, I would need for the primary to be center tapped. This transformer is not center tapped, but does have some taps for setting the primar; /archives//html/Amps/2015-02/msg00011.html (10,493 bytes)
14. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 18:35:23 -0600; 10 amps is pretty marginal, yes. But he might just get away with it, provided he doesn't use a continuous-duty mode like RTTY. That 10 amp rating is for CCS, not ICAS. My HV Variac (a Staco type 1250; /archives//html/Amps/2015-02/msg00012.html (10,533 bytes)
15. Re: [Amps] Variac Question (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Tue, 03 Feb 2015 08:38:10 +0800; No you don't need a centre tapped primary. Read it again and draw it on a piece of paper. Alek VK6APK On 3/02/2015 8:13 AM, Larry wrote: Mike, If I understand correctly, to do what you are suggesting; /archives//html/Amps/2015-02/msg00013.html (11,587 bytes)
16. Re: [Amps] Variac Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Mon, 2 Feb 2015 18:45:06 -0600; Exactly. I'm almost positive that my 240 volt primary transformer does not even have a center tap. 73, Mike www.w0btu.com _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2015-02/msg00014.html (8,283 bytes)
17. Re: [Amps] Variac Question (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 03 Feb 2015 13:41:44 +0000; Larry, My suggestion is to save that Variac for better uses, and reduce your high voltage by removing a suitable number of turns from the HV transformer's secondary! Depending on the transformer's co; /archives//html/Amps/2015-02/msg00019.html (8,368 bytes)
18. Re: [Amps] Variac Question (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 3 Feb 2015 10:59:42 -0500; If it is rated at 120/240VAC it has the equivalent of a CT Carl KM1H Exactly. I'm almost positive that my 240 volt primary transformer does not even have a center tap. 73, Mike www.w0btu.com No you d; /archives//html/Amps/2015-02/msg00021.html (9,861 bytes)
19. Re: [Amps] Variac Question (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 3 Feb 2015 11:00:00 -0500; With such a marginal variac the DC dynamic regulation is going to be pretty poor. When all else fails consider a choke input at least until you can get a proper transformer, you will wind up with abo; /archives//html/Amps/2015-02/msg00022.html (12,189 bytes)
20. [Amps] Variac Question (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 3 Feb 2015 08:52:35 -0800; Larry, My suggestion is to save that Variac for better uses, and reduce your high voltage by removing a suitable number of turns from the HV transformer's secondary! Depending on the transformer's co; /archives//html/Amps/2015-02/msg00025.html (9,591 bytes)

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