EIA Color Codes

EIA Speaker Color Code	2

EIA Wiring Color Code	3

EIA Transformer Color Code	4

IF Transformers	4

Power Transformers	4

A.F. Transformers	5

EIA Speaker Color Code

Voice-coil	Start	Black
Finish	Green
Field Coils	Start	Black and Red
Finish	Yellow and Red
Tap (If Any)	Slate and Red

EIA Wiring Color Code

B+	Red
Ground	Black
Plate	Blue
Grid	Green
Cathode	Yellow
High Heater	Brown
Low Heater	Black
Screen Grid	Orange
AVC	White

EIA Transformer Color Code

IF Transformers:

Plate Lead	Blue
"B" + Lead	Red
Grid (or diode) Lead	Green
Grid (or diode) Return	Black

NOTE: If the secondary of the IF transformer is center-tapped, the second diode plate lead is green-and-black striped, and black is used for the center-tap lead.

Power Transformers:

Primary Leads	Black
If tapped	Common	Black
Tap	Black and Yellow striped
Finish	Black and Yellow striped
High Voltage Plate Winding	Red
Center-tap	Red and Yellow striped
Rectifier Filament Winding	Yellow
Center-tap	Yellow and Blue striped
Filament Winding #1	Green
Center-tap	Green and Yellow striped
Filament Winding #2	Brown
Center-tap	Brown and Yellow striped
Filament Winding #3	Slate
Center tap	Slate and Yellow striped

Audio Frequency (A.F.) Transformers:

plate (finish) lead of primary	Blue
"B"+ lead (this applies whether the primary is plain

or center-tapped)	Red
plate (start) lead on center-tapped primaries (Blue may

be used for this lead if polarity is not important)	Brown
grid (finish) lead to secondary	Green
grid return (this applies whether the secondary is plain

or center-tapped)	Black
grid (start) lead on center-tapped secondaries (Green may

be used for this lead if polarity is not important)

Yellow

NOTE: These markings apply also to line-to-grid and tube-to-line

transformers.