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 Post subject: Power Transformer
PostPosted: Sep Sat 01, 2018 7:51 pm 
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Joined: Sep Sat 06, 2008 6:17 pm
Posts: 1086
Location: Central Pa, 17044
Hi guy's

I was over at the re-cycling place yesterday and found
an old 25in tube type television set, and it had a real nice
power transformer inside. I think the set was a Magnavox.
The transformer weighs 8 lbs and looks like it never over heated.
It seems to ohm out ok, but what would the out put be in watts
and current output. The primary is 2.2 ohms.
the numbers on the side are 25068580A01 and T85 037.
I don't know if these numbers will help with the out puts or not.
Any info would be greatly appreciated,
Thanks, Gary


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 Post subject: Re: Power Transformer
PostPosted: Sep Sat 01, 2018 8:32 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 9940
Location: Santa Rosa, CA
Large set TV transformers were good for about 200 Watts continuously.

Old hams like me used them to build AM transmitters with modulators. Mine ran about 150 W input with about 75 watts into the modulator (pair of 1625s).

http://amfone.net/Amforum/index.php?topic=16537.0;wap2

Image

You might also look in the Hammond catalog for a power transformer of similar size. It should be a comparable VA rating.

Rich


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 Post subject: Re: Power Transformer
PostPosted: Sep Sat 01, 2018 9:35 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4432
Location: Perrysburg, OH, 43551 U.S.A.
Rich,
I distinctly remember our family's first TV. It was a 1953 RCA with the blasted 21" picture tube, the so-called metal tube. The set's rating was 350 watts! :shock: The HV cage alone had a 6SN7GT, two 6W4GT's and a 6CD6 inside. That's 34.65 watts just for the filaments! When you consider that the flyback was mounted at the top of the cage, it's no wonder that set cooked them pretty quickly.
John

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“Never attribute to malice that which can be adequately explained by stupidity.”
― R. A. Heinlein


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 Post subject: Re: Power Transformer
PostPosted: Sep Sun 02, 2018 5:52 pm 
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Joined: May Sat 06, 2006 4:03 am
Posts: 3606
Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
If you had the model number of the TV maybe someone could run it through SAMS and get some data.

Bill J.


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 Post subject: Re: Power Transformer
PostPosted: Sep Sun 02, 2018 6:10 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3898
Location: Charleston, W.Va.
NumberMaj 1 wrote:
If you had the model number of the TV maybe someone could run it through SAMS and get some data.

Bill J.

Hi Gary,
Yes, exactly as Bill J. says above. The SAMS Photofact for the TV should give full specs for the power transformer.

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Poston


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