Which transformer wires are which?

Jclay85 · 6th June 2012, 04:03 PM

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:

And the Schematic:

And here are the wires that are coming from my PT. The source of my confusion...

Anyone out there who can point me in the right direction?

famousmockingbird · 6th June 2012, 04:18 PM

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.

Jclay85 · 6th June 2012, 05:32 PM

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?

Frank Berry · 6th June 2012, 05:42 PM

That's correct.

Jclay85 · 6th June 2012, 06:04 PM

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.

WithTarragon · 6th June 2012, 07:51 PM

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).

Speedskater · 6th June 2012, 11:44 PM

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.

6th June 2012, 04:03 PM	#1
Jclay85 diyAudio Member Join Date: May 2012	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: And the Schematic: And here are the wires that are coming from my PT. The source of my confusion... Anyone out there who can point me in the right direction?

6th June 2012, 05:42 PM	#4
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	That's correct. __________________ Frank

6th June 2012, 11:44 PM	#7
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	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. __________________ Kevin

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6th June 2012, 04:18 PM	#2
famousmockingbird diyAudio Member Join Date: Dec 2010 Location: Amesbury, MA	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.

6th June 2012, 05:32 PM	#3
Jclay85 diyAudio Member Join Date: May 2012	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?

6th June 2012, 06:04 PM	#5
Jclay85 diyAudio Member Join Date: May 2012	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.

6th June 2012, 07:51 PM	#6
WithTarragon diyAudio Member Join Date: Jun 2007	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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