10V Transformer

[trem]

I have an old tranny with a 10V secondary, but I am not sure how to wire the primary. The label on the transformers says:
Black - Common
Blck/Ylw - 107
Blck/Red - 117

For use in my home (USA 120V) should I wire the transformer primary:
Hot - Blck/Red
Neutral - Common
Blck/Ylw - Not used, just safe it off.

Thank You

[Chuck H]

For use in my home (USA 120V) should I wire the transformer primary:
Hot - Blck/Red
Neutral - Common
Blck/Ylw - Not used, just safe it off.

Yup.

You can expect a secondary of 10.25 volts

Chuck

[Bruce / Mission Amps]

I have an old tranny with a 10V secondary, but I am not sure how to wire the primary. The label on the transformers says:
Black - Common
Blck/Ylw - 107
Blck/Red - 117

For use in my home (USA 120V) should I wire the transformer primary:
Hot - Blck/Red
Neutral - Common
Blck/Ylw - Not used, just safe it off.

Thank You

Is there only three wires on it?.

[trem]

Hey Bruce -
Yes, three wires on each side.
It is an "older" transformer; the label says Filament Transformer.
I have it wired and I get 11.12 VAC. My meter is an Amprobe 35XP-A. It seems to be a fairly decent/accurate meter for this kind of stuff.
My intention with this was mostly for testing transformers, so it would be nice if I could get it a lot closer to 10 VAC.
Thanks

[Chuck H]

Over is better than under. What will the load on it be? That could drop some voltage. You can also drop some volts with a resistor on the CT if you plan to use it. If not you can use a resistor in line too.

Chuck

[trem]

Over is better than under. What will the load on it be? That could drop some voltage. You can also drop some volts with a resistor on the CT if you plan to use it. If not you can use a resistor in line too.

Chuck

I do not have any kind of AC Power Supply. I thought this would be an easy/inexpensive way to have 10 VAC. Just for another piece of test equipment; to make sure a tranny works, testing an unknown tranny, etc. etc.

[Chuck H]

I do not have any kind of AC Power Supply. I thought this would be an easy/inexpensive way to have 10 VAC. Just for another piece of test equipment; to make sure a tranny works, testing an unknown tranny, etc. etc.

In that case the easy 10V math your after would elude you anyway since you'll be using varying loads. All transformers load the supply voltage somewhat due to their inductance. You always have to test your input voltage with the transformer in test to know the real voltage that you base your math on. This is where adjustable units come in handy. You can put the transformer in test and then adjust your input voltage to some 10x figure that makes the math easy.

Chuck

[trem]

You have me all figured out....
OK, so I will make do with what I have, and adjust my math skills to match the simplicity of my test equipment.
Thank You