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Total 12 documents matching your query.

1. [Amps] Buzzing transformer (score: 1): Author: "Carol Richards" <n2mm@comcast.net>; Date: Sun, 25 Sep 2016 14:02:06 -0400; Hello all.... This past weekend I ran into a new problem in the CQWW-RTTY contest. For some reason, the power transformer in my Alpha 76PA started buzzing big time everytime it was keyed.. The transf; /archives//html/Amps/2016-09/msg00114.html (7,059 bytes)
2. Re: [Amps] Buzzing transformer (score: 1): Author: "Joe Giacobello, K2XX via Amps" <amps@contesting.com>; Date: Sun, 25 Sep 2016 21:54:44 -0400; Carol, make sure that it's not the choke and not the trans. 73, Joe K2XX This past weekend I ran into a new problem in the CQWW-RTTY contest. For some reason, the power transformer in my Alpha 76PA s; /archives//html/Amps/2016-09/msg00118.html (8,504 bytes)
3. Re: [Amps] Buzzing transformer (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Mon, 26 Sep 2016 17:19:21 +0000; Hi Carol, If the transformer is getting hot, and I mean so hot that it cannot be touched, then it could be a shorted turn on one of the windings - bad news as it means the transformer is effectively; /archives//html/Amps/2016-09/msg00121.html (9,090 bytes)
4. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 27 Sep 2016 11:03:21 +1300; If the transformer has a shorted winding, I expect it would go up in smoke in short order! Any transformer can have a winding replaced - they were actually assembled that way. S ____________________; /archives//html/Amps/2016-09/msg00125.html (7,788 bytes)
5. Re: [Amps] Buzzing transformer (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Thu, 29 Sep 2016 05:39:25 +0000; Hi Steve, I agree that any transformer can have a winding replaced, but would it be cost effective, particularly with a small transformer? It would probably be cheaper to buy a new unit. David G4FTC; /archives//html/Amps/2016-09/msg00134.html (9,059 bytes)
6. Re: [Amps] Buzzing transformer (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Thu, 29 Sep 2016 08:17:32 -0700; I had a "buzzing" XFMR in a 516F-2 Supply. Turned out the bolts holding the laminations together needed tightening. Buzz gone !! 73, Dick, W1KSZ _______________________________________________ Amps m; /archives//html/Amps/2016-09/msg00138.html (9,935 bytes)
7. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 30 Sep 2016 08:56:58 +1300; I agree that any transformer can have a winding replaced, but would it be cost effective, particularly with a small transformer? It would probably be cheaper to buy a new unit. Just have a go at it.; /archives//html/Amps/2016-09/msg00139.html (7,767 bytes)
8. Re: [Amps] Buzzing transformer (score: 1): Author: "Jeff AC0C" <keepwalking188@ac0c.com>; Date: Thu, 29 Sep 2016 15:53:47 -0500; My PA76 buzzes a bit. But I had another PA76 transformer from a guy who swapped it for a Dahl and that one sung like crazy. Used it for a ton of key down power tests on an amp I was building and it n; /archives//html/Amps/2016-10/msg00000.html (8,514 bytes)
9. Re: [Amps] Buzzing transformer (score: 1): Author: Roger <ai7rogerroger@gmail.com>; Date: Thu, 29 Sep 2016 14:48:27 -0700; Provided the windings are good, I'm wondering if it wouldn't be possible to rebake the transformer or even apply an additional coating of sealant and rebake to see if it would reseal the pieces parts; /archives//html/Amps/2016-10/msg00001.html (8,381 bytes)
10. Re: [Amps] Buzzing transformer (score: 1): Author: "Gary Smith" <Gary@ka1j.com>; Date: Thu, 29 Sep 2016 17:36:43 -0400; I remember having a transformer buzz due to loose laminations. I mentioned it to a friend who did castings at work and he said to bring it by. They had a vacuum jar large enough to put it in. We sla; /archives//html/Amps/2016-10/msg00002.html (8,214 bytes)
11. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 30 Sep 2016 10:58:58 +1300; Often it is about how the transformer is designed ; A low flux density (more overall windings on the core) will give a quiet transformer at idle with low standing loss, but worse regulation at full l; /archives//html/Amps/2016-10/msg00003.html (9,263 bytes)
12. Re: [Amps] Buzzing transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 30 Sep 2016 18:59:36 +0000; Hi, some general rules about buzzing transformers: - Tighten it up. Torque all the bolts, and don't forget to tighten up the center leg too. That's best done by driving insulating wedges of suitable; /archives//html/Amps/2016-10/msg00009.html (11,507 bytes)

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