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 Post subject: Philco 38-3 power transformer
PostPosted: May Mon 20, 2019 8:17 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 116
Location: caseyville il
The secondary high voltage winding is open I am working
on the voltage and current ratings for a replacement. Does anyone have any suggestions


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 Post subject: Re: Philco 38-3 power transformer
PostPosted: May Mon 20, 2019 8:44 pm 
Member

Joined: Nov Tue 14, 2017 5:09 am
Posts: 1864
Location: Austin, Texas
That doesn't seem to be a good model number. What are the tubes in the radio?

Jay


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 Post subject: Re: Philco 38-3 power transformer
PostPosted: May Mon 20, 2019 10:09 pm 
Member

Joined: May Fri 01, 2015 2:33 am
Posts: 1405
Location: Roslyn,Pa 19001
http://www.nostalgiaair.org/Resources/243/M0013243.htm

Terry


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 Post subject: Re: Philco 38-3 power transformer
PostPosted: May Tue 21, 2019 2:20 am 
Member

Joined: Nov Tue 14, 2017 5:09 am
Posts: 1864
Location: Austin, Texas
Terry,

Thanks, I forgot that it might be the chassis number instead of a radio model number.

Assuming that it is a 9 tube, triple chassis, radio, the high voltage winding needs to produce 330VDC at about 120mA.
If the transformer is rated for the DC output at the rectifier, the requirements are above.
If the transformer is rated for AC output, the 5Y4 curves show that it requires 325VAC on each plate to get 330VDC output at 120mA.
The RMS current rating for the high voltage winding will need to be at least 180mA.

Jay


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 Post subject: Re: Philco 38-3 power transformer
PostPosted: May Wed 22, 2019 2:14 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 116
Location: caseyville il
Thanks to JhTX for your post it will help a lot.
A came up with a Hammond 273DZ horiz. mount
it might be a little low on the current rating.
I will go back and research again and see what I can find.
thanks a million guys
George Kirk
Caseyville Illinois


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