[ARC5] Slightly OT: Transformers

[Fuqua, Bill L]

  In the late 60's or 70's there was a multipage article in Electronics Magazine on power  transformers
and how you can determine the rating of a transformer up to kW range. The magazine is gone now
but perhaps there is a URL that has the PDF of those magazines.
73
Bill wa4lav

________________________________________
From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on behalf of Eric Mynes [kc8wzb at gmail.com]
Sent: Wednesday, November 27, 2013 6:10 PM
To: ARC5 at mailman.qth.net
Subject: [ARC5] Slightly OT: Transformers

Greetings all,

I have some questions about transformers and this seems to be the only
group I'm in now that deals with tube rigs.  I hope you don't mind elmering
me a bit by answering a few questions.  I mention slightly off topic
because one day (hopefully soon) I'll start building a power supply to use
with my ARC 5 rigs, but for now, I just want to be able to power some basic
homebrew tube transmitters.

So, my questions go along the lines of...  I have several transformers that
have followed me home from hamfests or someone has given me.  But most are
not labeled in any fashion as to what they are rated for.  As stated above,
I'd like to build a small power supply that can run some homebrew tube
rigs.  I might actually use some of the thousands of tubes that followed me
home from hamfests instead of leaving them piled in boxes with no use.
I've tried googling any number or marking on the transformers trying to
find a manufacturer or specifications and haven't had any luck.  How can I
test these safely as to not hurt myself or the transformer so that I find
out at least the voltages I should expect out of them?  Right now, I'm not
too concerned about finding how many amps they will provide as much as now
much voltage is on the end of the wire.  The number of amps question will
come soon though.

Currently I have a transformer on my bench that has the following markings
110v004h82
352052

It appears to have 3 windings.  A black set (I presume is the primary), a
red set with CT, and a green set with CT.

I'm kind of skittish at just applying 110v to the black wires and seeing
what the others have for voltages.  So, I figure why not ask some hams that
might have a better clue than me.

Please respond to me off the list as I don't want to waste too much of the
list's bandwidth on something that might be determined as an elementary
question that we all should know.  I'll be quick to say that I'm a very
much at an elementary stage on using HV and know enough to ask questions
before just trying things.

Thank you for the bandwidth and Happy Thanksgiving to all

73,
Eric
k8ohz
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