[ARC5] Slightly OT: Transformers

[hwhall at compuserve.com]

 Filament winding leads are often easy to identify due to being heavy wire. Normally, they will be 5.0, 6.3 or 12.6 VAC windings. Applying one of those low voltages to one of those suspected fil windings should allow measurement of the other windings to see what they were. For example, if you pick a pair of apparently filament leads, apply 6.3VAC and? the other pairs turn up voltages like 115 to 120VAC, and 5.0 VAC then you guessed right and know what the other windings should be. If the measured results aren't logical, try a different voltage on that fil pair. If nothing leads to logical readings, then it may not be a normal power transformer (i.e., may be a special purpose item).

 

Wayne
WB4OGM


-----Original Message-----
From: Eric Mynes <kc8wzb at gmail.com>
To: ARC5 <ARC5 at mailman.qth.net>
Sent: Wed, Nov 27, 2013 3:10 pm
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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