| Transformer Information Available
Power Transformers
IF Transformers
Audio Transformers
Power
Transformer Color Codes
Non-tapped primary leads: Black
Tapped primary leads: Common: Black
Tap: Black/Yellow striped
Finish: Black/Red striped
High-voltage plate winding: Red
Center tap: Red/Yellow striped
Rectifier filament winding: Yellow
Center tap: Yellow/Blue striped
Filament winding 1: Green
Center tap: Green/Yellow striped
Filament winding 2: Brown
Center tap: Brown/Yellow striped
Filament winding 3: Slate
Center tap: Slate/Yellow striped
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IF
Transformer Color Codes
Without Secondary
Plate lead: Blue
B+ lead: Red
Grid (or diode) lead: Green
Grid (or diode) return: Black
With Secondary
Second diode plate lead: Green-and-Black striped
Center tap: Black
Slug Color Codes
Frequency Application Slug color
455 kHz 1st IF Yellow
2nd IF White
3rd IF Black
Osc tuning Red
10.7 MHz 1st IF Green
2nd or 3rd IF Orange, Brown or Black
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Audio
Transformer Color Codes
Plate lead of primary: Blue
B+ lead (plain or center-tapped): Red
Plate (start) lead on center-tapped primaries: Brown (or Blue*)
Grid (finish) lead to secondary: Green
Grid return (plain or center-tapped): Black
Grid (start) lead on center-tapped secondaries: Yellow (or Green*)
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* Possible color if polarity is not important.
NOTE: These markings also apply to line-to-grid and tube-to-line transformers.
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