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another mystery transformer




 
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W8ACR
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Penta 254W


« on: May 14, 2018, 11:09:56 PM »

Here are two pictures of a transformer that I picked up in Missouri this past weekend. Can anybody tell me what I have here? I think it is a modulation transformer, but the numbers are given in volts, not ohms, so I'm not sure. Thanks, Ron W8ACR


* IMG_0519.JPG (3219.73 KB, 4032x3024 - viewed 99 times.)

* IMG_0520.JPG (1837.69 KB, 4032x3024 - viewed 63 times.)
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KD6VXI
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« Reply #1 on: May 14, 2018, 11:42:35 PM »

Looks like it's a biggun....

But, instead of impedance, it gives (what I would assume is working) voltage ratings....

A 750 watt modulation xformer.

1800 volts in the rf deck.

2450 on the mod tubes.

Looks like it's set up for big positive peaks!

--Shane
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w4bfs
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« Reply #2 on: May 15, 2018, 02:48:40 AM »

agreed ... also nice small tertiary windings for screen modulation or system feedback...

not sure if it requires a mod reactor but usual practice would be yes .... maybe not at lower power ... worth a try
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WZ1M
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« Reply #3 on: May 15, 2018, 03:09:52 AM »

Its nothing more than a plate transformer.
Regards,
Gary
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WBear2GCR
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« Reply #4 on: May 15, 2018, 10:37:21 AM »

Gary,

Very odd that a plate transformer would include a 40-15,000kc specification?!?

                       _-_-
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KD6VXI
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« Reply #5 on: May 15, 2018, 10:52:37 AM »

It's a modulation transformer out of a Gates BC500T.

It does need a reactor.

--Shane
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KB2WIG
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« Reply #6 on: May 15, 2018, 10:56:20 AM »



Maybe that Kim Jong-un has a reactor for Ron?

klc
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W8ACR
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Penta 254W


« Reply #7 on: May 15, 2018, 12:06:51 PM »

Agree that it is a mod transformer from a BC-500T. Does anybody know what were the final and modulator tubes in that transmitter? And what were the plate voltages and currents for those tubes?

Thanks, Ron W8ACR
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WD8BIL
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« Reply #8 on: May 15, 2018, 12:49:57 PM »

http://amfone.net/Amforum/index.php?topic=28009.0

There is another thread on it but I ain't got time to find it right now.
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K6IC
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« Reply #9 on: May 15, 2018, 02:27:01 PM »

Perhaps a bit more detail on the AMWindow:

http://amwindow.org/tech/htm/modtran/misc/am30469.htm

Perhaps redundant info ...   but,   nice find Ron.

73,   Vic
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WZ1M
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« Reply #10 on: May 16, 2018, 01:54:39 AM »

Sorry, my bad, I should of said mod iron.
Gary
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KD6VXI
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« Reply #11 on: May 16, 2018, 09:22:17 AM »

Lol.  It's all good, Gary.  We are all entitled to a slip up a year. 😀



--Shane
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John K5PRO
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« Reply #12 on: May 25, 2018, 07:25:25 PM »

Pair of 833 and single 833 for RF probably in Gates BC500T.
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