[ARC5] Slightly OT: Transformers

[Gary Pewitt]

If you have a variac apply 12 volts AC to the primary rather than 120v.  
All of the secondary voltages will be 1/10th of the normal voltages and 
much safer to work with in your testing.


On 11/27/2013 5:10 PM, Eric Mynes wrote:
> 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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-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927