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GENERAL HOOKUP WIRE Ground Filament B+/HT Screen grid Cathode Control grid Plate Power Supply negative AC Line AGC (receivers) or C- (bias) Black Brown Red Orange Yellow Green (except when green wire is used for safety ground on line cords) Blue Violet Grey (except some line cords are Black / White) White AUDIO FREQUENCY TRANSFORMERS Plate (finish) lead of primary B+ lead Plate (start) Grid (finish) lead to secondary Grid return Grid (start) Blue Red (applies whether or not the primary is center tapped) Brown (lead on center-tapped primaries, Blue may be used if polarity is unimportant) Green Black (this applies whether the secondary is plain or center tapped) Yellow (lead on center tapped secondaries Green may be used if polarity is unimportant) Note: These markings apply also to line-to-grid and tube-to-line transformers. POWER TRANSFORMERS Primary Leads •Common •Tap •Finish Black, and if tapped: Black Black and Yellow Striped Black and Red Striped High Voltage Plate •Center Tap Rectifier Filament •Center Tap Filament Winding 1 •Center Tap Filament Winding 2 •Center Tap Filament Winding 3 •Center Tap Red Red and Yellow Striped Yellow Yellow and Blue Striped Green Green and Yellow Striped Brown Brown and Yellow Striped Slate Slate and Yellow Striped Source: Radio Amateurs Handbook, ARRL, 1968