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KG6UTS
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« on: May 19, 2011, 01:31:06 PM » |
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I have a new unused UTC transformer/doorstop that I can not find in catalogs looked at so far. It is:
About 3/4 the size of a 1 gallon paint can with a four bolt mounting flange, grey, hermetrically sealed.
UTC H5539
NT 5148
TF 1A 13 YY
1,2,3 4800 ohms ct ( these pins are ribbed ceramic insulators about 5/8" tall)
500MA Bal DC ES
4,5 10 ohms (1/4" ceramic insulators)
300~7KC
500Watts
Since it is rated in KC I'd guess it was made before the mid '60s. Anyway, one honkin' audio xfmr, any ideas??
Thanks!
EdZ KG6UTS
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K6IC
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« Reply #1 on: May 19, 2011, 02:17:20 PM » |
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Hi Ed,
Poked around very little with Google, did not find this P/N. Would guess that it is a PA transformer. Some of the military PAs ran two or four 211s.
But, I really know nothing. GL 73 Vic
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WA1GFZ
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« Reply #2 on: May 19, 2011, 03:08:54 PM » |
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I bet some audio fool would pay big bucks for it.
Do your homework if you decide to sell it.
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KA2DZT
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« Reply #3 on: May 20, 2011, 03:35:27 AM » |
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Usually xfmrs with 4 digit part numbers are specials and not regular catalog models. The xfmr looks like a big audio output xfmr.
Fred
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W2VW
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« Reply #4 on: May 20, 2011, 06:22:26 AM » |
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Grab a honking outdoor power rated audio amp and use the iron to modulate a good sized class C final. : )
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steve_qix
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Bap!
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« Reply #5 on: May 20, 2011, 07:56:55 AM » |
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The 500 ohm output and the voice-range frequency response point strongly to a public address system output transformer.
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KM1H
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« Reply #6 on: May 20, 2011, 08:48:34 AM » |
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What 500 Ohm output?
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W2PFY
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« Reply #7 on: May 20, 2011, 05:04:59 PM » |
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You could use it as a mod transformer using a solid state amp as the audio source.
In WW2 the US Army has an amplifier that was used to feed propaganda driving a bunch of metal speaker horns. The amplifier used two 805 triodes with forced air cooling on them. IIRC the 805 will put out 370 watts at 1500 volts. Since the army was air cooling them, maybe 500 watts was doable. That may be the source of that transformer.
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The secrecy of my job prevents me from knowing what I am doing.
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steve_qix
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« Reply #8 on: May 20, 2011, 05:14:28 PM » |
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What 500 Ohm output?
I must have read the post wrong. It's 500 MA not 500 ohms. Scratch the PA output tranny  |
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W7TFO
WTF-OVER in 7 land Dennis
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IN A TRIODE NO ONE CAN HEAR YOUR SCREEN
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« Reply #9 on: May 20, 2011, 11:59:28 PM » |
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Nah, the 'Beachmaster' was built by Western Electric, and had all in-house iron in it.
I have an example here.
That UTC was a lot later looking job, but definitely military contract.
73DG
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Just pacing the Farady cage...
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KA2DZT
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« Reply #10 on: May 21, 2011, 03:21:17 AM » |
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What 500 Ohm output?
I must have read the post wrong. It's 500 MA not 500 ohms. Scratch the PA output tranny Steve, One more mistake like that and we'll come there and take away all of your mosfets, so you don't hurt yourself. Fred |
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KG6UTS
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« Reply #11 on: May 22, 2011, 10:58:23 PM » |
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You could use it as a mod transformer using a solid state amp as the audio source.
I thought it might be something with solidstate drive to tube amp final. The secondary insulators look like they were made to stand some voltage. It was free so nothing lost experimenting, will post a picture. Thanks all! EdZ KG6UTS |
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