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Old 6th June 2012, 04:03 PM   #1
Jclay85 is offline Jclay85  United States
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Default Which transformer wires are which?

Im building a clone of a Supro Thunderbolt, and I've recently run in to a little bit of confusion. I sourced all my own parts, and power tranny I have doesn't match up exactly with the one in the diagram & schematic I've been referencing. Just want to make sure I don't screw anything up by guessing...

Can anyone shed some light on which wires go where?

Here is the diagram I've been referencing:
Click the image to open in full size.

And the Schematic:
Click the image to open in full size.

And here are the wires that are coming from my PT. The source of my confusion...
Click the image to open in full size.

Anyone out there who can point me in the right direction?
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Old 6th June 2012, 04:18 PM   #2
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These are just guess' but I believe that the green wire are for 6.3 heaters but instead of creating an artificial center tap with two 100 ohm resistors the green wire with yellow stripe is a true center tap.
The red wires are high voltage secondary and red with yellow is the center tap for them.
Yellow wires are 5v heater wire for rectifier.
Black wires I am assuming are primary wires.

An ohm meter should answer all of your questions so don't take my word on what wire should go where.
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Old 6th June 2012, 05:32 PM   #3
Jclay85 is offline Jclay85  United States
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Thank you for taking the time to offer your knowledge. It's starting to make a little more sense now. So basically, If I wanted to follow the diagram/schematic, I could just leave the green center tap unused, and run the two other green leads to the pilot light, as well as the filaments and heaters?
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Old 6th June 2012, 05:42 PM   #4
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That's correct.
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Old 6th June 2012, 06:04 PM   #5
Jclay85 is offline Jclay85  United States
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perfect. Really appreciate it guys. I know you've probably heard it a thousand time, but for a beginner like me, it really is awesome to have this resource to turn to.
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Old 6th June 2012, 07:51 PM   #6
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Get a voltmeter and please verify Frank's advice first. Do not plug it into the wall until this has been done. At the very least, start the PS up first with a bulb tester in place (search threads on how to construct one).
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Old 6th June 2012, 11:44 PM   #7
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One safe way to test a power transformer is: Get a little wall-wart power supply. With an output of about 10 or 12 Volts "AC" (10V more or less). Hook it up to what you think is the primary, measure all the secondaries, then use a little math to figure things out.

Repeat: an "AC" output wall-wart.
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