Slightly off topic, but I need help - Victoria Magnetics - diyAudio
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Old 20th May 2011, 02:48 PM   #1
NYCOne is offline NYCOne  United States
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Default Slightly off topic, but I need help - Victoria Magnetics

I posted this in the PS forum, but didn't get any responses.

I received a Victoria Magnetics (VM) Transformer in a trade today. The transformer reads "Model #2X14-5005" 117VAC. IT has the following wires:

2x black
2x red
2x white with black stripe
1x green

I assume its a 2x14V 500VA transformer. Any experience on the purposes of each color and wire? With a DMM, there's very little resistance with each pair of wires that are the same color.

I would call VM, but I think they're out of business.
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Old 20th May 2011, 03:52 PM   #2
tinitus is offline tinitus  Europe
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sorry, I don't understand your question
looks very straight forward

with 2x 14V you need two secondary
one secondary black wired, and the other red

one red and black connects together, forming CT/ground
need to find winding direction for correct phasing

black and whites are 2x 117V
in series for 230V mains
paralel for 120V mains
again, need to find winding direction for correct phasing

well, it appears to be so
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Old 20th May 2011, 05:17 PM   #3
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Maybe you want to take an ohmmeter and find out which leads are
connected to which.

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Old 20th May 2011, 05:43 PM   #4
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by Nelson Pass View Post
Maybe you want to take an ohmmeter and find out which leads are
connected to which.

I took a shot at that, I should have posted the results:

0R6 black to black
0R2 red to red
0R2 wb to wb
I get infinite resistance with other combos.

The item looks new, I guess there's a chance there's a problem. It could also be perfect and I don't see the path...

Last edited by NYCOne; 20th May 2011 at 06:09 PM.
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Old 20th May 2011, 06:05 PM   #5
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by tinitus View Post
sorry, I don't understand your question
looks very straight forward

with 2x 14V you need two secondary
one secondary black wired, and the other red

one red and black connects together, forming CT/ground
need to find winding direction for correct phasing

black and whites are 2x 117V
in series for 230V mains
parallel for 120V mains
again, need to find winding direction for correct phasing

well, it appears to be so
Maybe straightforward for you...not for me.

I'm happy to plug this thing in and let the chips fall where they may, but I thought I'd ask before I kill someone by mistake.

I've had Anteks before and they are black and red to 110V with the other colors being the secondaries. Now you can see my confusion. I'd have thought the black and reds are 110V and the WB and the ground form a CT 14-0-14.

I know these were popular transformers about 5 years ago, I was hoping someone had direct experience.
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Old 20th May 2011, 11:12 PM   #6
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by NYCOne View Post

I've had Anteks before and they are black and red to 110V with the other colors being the secondaries. Now you can see my confusion.
you should be able to detect the primary windings
they are often thinner, and more flexible
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Old 21st May 2011, 12:21 AM   #7
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Quote:
Originally Posted by tinitus View Post
you should be able to detect the primary windings
they are often thinner, and more flexible
-And probably have a higher DCR.
I'll hazard a guess that the black pair is 120V,and red and black/white are the low voltage secondaries.

The Green wire might be an internal electrostatic shield. Is there continuity from the green lead to any of the others? Continuity from the green wire the the transformer case/core?
I'd guess that it's a shield,and can be earth grounded.

Just some Wild A** Guesses.
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Old 21st May 2011, 01:04 AM   #8
tinitus is offline tinitus  Europe
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unless you also have additional low wattage winding as well

you said, 'I assume its 2x 14V'

any good reason for 'assuming'
or it could be anything
like if theres just one primary for 110V mains
which leaves a lot of other options for the remaining windings

first and most its important to find the primary, to be able to power it up, and measure voltage
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Old 22nd May 2011, 10:17 PM   #9
Jeff R is offline Jeff R  United States
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I agree with DigitalJunkie. The red and white/black windings appear to have the same winding resistance so it is logical to assume they are the two equal-voltage secondaries. That would be pretty much confirmed if you can count fewer windings for those colors vs. the black winding (if you are stepping down a voltage, there will be fewer turns).

The part number implies that with 110 VAC input you will get 14 VAC on the two secondaries. Pay attention to polarities!

Please don't just plug a winding into the wall to test! If we got it backwards, you might end up with over 1,000 on another winding, will may cause sparks and damage. It would be best to use a variac, or maybe you could feed a winding with an audio signal (sinewave generator), or even the output of a low voltage transformer, to see what the turns ratios are.
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Old 23rd May 2011, 12:21 AM   #10
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I just took a look at the picture I sent you again and think that this
how the leads are:
2 x Black skinny leads = primary
1 x White lead with Black stripe and heat shrink is the beginning of sec #1
1 x White lead with Black stripe is the end of sec #1
1 x Red lead with heat shrink is the beginning of sec. #2.
1 x Red lead is the end of sec #2.
1 x Green is shield / ground.
I hope this helps. Could not attach photo here.
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