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Title: What is it? Post by: N2DTS on December 22, 2015, 02:30:17 PM Found this nice transformer on the audio shelf, I replaced the wires on it years ago but have no idea what it is.
It might have come out of a viking 2, or a B+W 5100, or have come out of something else. It has 17810 on the top, has a center tapped side that measures 80 ohms and two separate primary's that measure 25 ohms and 48 ohms. I can not figure any audio transformer that would be set up that way so maybe its a power transformer? Being very smart, the wire colors I chose are no help at all.... (https://n2dts.smugmug.com/Ham-radio/i-V54NxG2/0/XL/PC220365-XL.jpg) Title: Re: What is it? Post by: W4RFM on December 22, 2015, 04:39:41 PM If it stands about 3 inches high or so, it might well be a mod tranny for a Viking 2.
Title: Re: What is it? Post by: Opcom on December 22, 2015, 06:06:09 PM The 48 Ohm winding might be the plate mod winding and the 25 Ohms one a low current screen mod winding. Very nice transformer, very pretty.
Title: Re: What is it? Post by: N2DTS on December 22, 2015, 09:48:51 PM Its a slight bit smaller then the viking 2 mod transformer, I have one of those.
Title: Re: What is it? Post by: N1BCG on December 29, 2015, 07:27:19 PM The third winding (25 Ohm) might be the feedback winding if it's a mod xformer. Have you tried sweeping it with audio or putting a low ac voltage into one of the windings to check the ratios?
Clark Title: Re: What is it? Post by: N2DTS on December 29, 2015, 08:46:39 PM No, I have done no tests.
It was just something I found on the audio shelf, it was something I bothered to put new wires on in the past but DUH! forgot to mark with what it was. dx100, viking 2, 32V, and maybe a B+W 5100 were radios I had parts out of... Or a ham fest special... Title: Re: What is it? Post by: Pete, WA2CWA on December 30, 2015, 01:58:42 AM We could site here for the next several weeks speculating what it might be.
Do some tests, or toss it, or offered it free for shipping (and let some else figure it out) Title: Re: What is it? Post by: N2DTS on December 30, 2015, 11:46:39 AM I just asked because I thought someone who had the transmitters listed might know the number stamped on top.
Its not worth my time to test and so on so it goes in the trash. Title: Re: What is it? Post by: DMOD on December 30, 2015, 12:19:33 PM Its not worth my time to test and so on so it goes in the trash. Never, never, never trash a transformer. Some day you will be building a PS or a modulator and go, "Where is that transformer I had that would have been perfect for this?" ;D Phil - AC0OB Title: Re: What is it? Post by: N2DTS on December 30, 2015, 12:43:44 PM But in order to use it, you have to know what it is...
Its not worth my time to test and so on so it goes in the trash. Never, never, never trash a transformer. Some day you will be building a PS or a modulator and go, "Where is that transformer I had that would have been perfect for this?" ;D Phil - AC0OB Title: Re: What is it? Post by: w4bfs on December 30, 2015, 08:08:11 PM Found this nice transformer on the audio shelf, I replaced the wires on it years ago but have no idea what it is. It might have come out of a viking 2, or a B+W 5100, or have come out of something else. It has 17810 on the top, has a center tapped side that measures 80 ohms and two separate primary's that measure 25 ohms and 48 ohms. I can not figure any audio transformer that would be set up that way so maybe its a power transformer? Being very smart, the wire colors I chose are no help at all.... (https://n2dts.smugmug.com/Ham-radio/i-V54NxG2/0/XL/PC220365-XL.jpg) when you replaced wire did you use some that was handy or some other reason several tests to run that will give you quick info .... 1. ballast with a 60 to 100W incad bulb and apply 120 vac 60 hz to the whole primary ... if the bulb remains dark or dim it is probably good xfmr .... measure ac volts applied .... say for example 100 Vac ... now measure sec volts, carelully of course, say you get 70V on one and 50V on other ... now you know turns ratios 2. dig out the 2 ch audio scope and audio oscillator .... this will let you get a prelim idea of freq response and winding phasings .... will need to try loading resistors for refinement Title: Re: What is it? Post by: Opcom on December 30, 2015, 11:41:39 PM give it t someone don't throw it out.
Title: Re: What is it? Post by: KA2DZT on December 31, 2015, 12:21:44 AM If it's cross laminated it is a power xfmr. Audio xfmrs will have lamination like a choke. It is a special xfmr, made for some piece of equipment, because of the five digit part number. No way to know exactly what the xfmr is, but some simple testing can tell about what it is.
Fred Title: Re: What is it? Post by: Pete, WA2CWA on December 31, 2015, 02:06:33 AM For fun and giggles, put it on ebay with the part number you have. Let the crazy people do their thing.
Title: Re: What is it? Post by: WZ1M on December 31, 2015, 02:29:25 AM If it's cross laminated it is a power xfmr. Audio xfmrs will have lamination like a choke. It is a special xfmr, made for some piece of equipment, because of the five digit part number. No way to know exactly what the xfmr is, but some simple testing can tell about what it is. Fred Fred: Modulation transformers can be cross laminated. More so than not. Regards, TRS Gary Title: Re: What is it? Post by: KA2DZT on December 31, 2015, 01:53:56 PM If it's cross laminated it is a power xfmr. Audio xfmrs will have lamination like a choke. It is a special xfmr, made for some piece of equipment, because of the five digit part number. No way to know exactly what the xfmr is, but some simple testing can tell about what it is. Fred Fred: Modulation transformers can be cross laminated. More so than not. Regards, TRS Gary Thanks Gary, I better take a closer look at my mod xfmrs, thought most were not cross laminated. The DC resistances he posted leads me to believe it not a power xfmr. Most 120vac primaries have a very low DC resistance, a few ohms. Fred |