Isolation Transformer Info Needed

john iverson K0EWU jackiv at JUNO.COM
Sun Jan 7 15:10:16 EST 2001

HI Bob.  The UTC catalogue of 1956 #56A shows the R-72 at 40 watts, the
R-73 at 100 watts.
the transformers have a heat rise of about 40deg F, this is quite warm.
ie, Don't worry if it is just "good and warm".
jack <jackiv at

On Sun, 7 Jan 2001 16:39:25 -0500 Robert Lawson <w4rl at BELLSOUTH.NET>
> Fellow BA'er,
> I need information on the folowing UTC (Universal Transformer Corp
> ?)
> isolation transformers that I have ie models R-72 and R-73. I need
> the
> wattage ratings for them. Of note, when I use the R-72 with my
> Hallicrafters S-53A for a hour or more, the R-72 becomes warm to
> the
> touch. Not hot, just good and warm. The paper sticker on the back of
> the
> S-53A reads "50 Watts". When used with the R-73 isolation
> transformer it
> is cool to the touch after hours of operation. Is there a web page
> for
> such UTC isolation transformers?
> Thanks in advance.
> Regards,
> Robert WPE4FGR W4RL Pensacola Florida

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