Atwater Kent Resistor Color Codes
Atwater Kent used a unique color code to designate resistor values in their later radios.
The follwing tables give the colors and corresponding values (from SM Sep 1934 & other sources).
(Note: There are a couple of inconsistencies which I am trying to resolve, like two values for Blue.
Questionable entries are shown in red in the Color Order table.)
The first table is in order by color, while the second is in order by value.
Color Order
Black |
65,000 |
Blue-Green-Red |
500 |
Green-Yellow |
900,000 |
Black-Blue |
1,100 |
Blue-Red-Black |
1,100 |
Maroon |
10,000 |
Black-Green |
3,300 |
Blue-Yellow |
5,000 |
Maroon-Blue |
300 |
Black-Green |
1,500 |
Blue-Yellow-Green |
425 |
Purple |
6,000 |
Black-Purple |
500,000 |
Blue-Yelow-Red |
200 |
Purple-Red |
12,500 |
Black-Red |
20,000 |
Gray |
30,000 |
Purple-Yellow |
12,500 |
Black-Yellow |
150,000 |
Gray-Green |
15,000 |
Red |
12,500 |
Black-Yellow-Red |
50,000 |
Gray-Yellow |
15,000 |
Red-Blue |
100,000 |
Blue |
2,000 |
Green |
2,000,000 |
Red-Gray |
800,000 |
Blue |
100,000 |
Green-Blue |
4,000 |
Red-Yellow |
250,000 |
Blue-Gray |
1,000,000 |
Green-Gray-Red |
2,500 |
White |
40,000 |
Blue-Gray-Yellow |
165 |
Green-Red |
3,300 |
Yellow |
7,500 |
Value Order
165 |
Blue-Gray-Yellow |
4,000 |
Green-Blue |
40,000 |
White |
200 |
Blue-Yelow-Red |
5,000 |
Blue-Yellow |
50,000 |
Black-Yellow-Red |
300 |
Maroon-Blue |
6,000 |
Purple |
65,000 |
Black |
425 |
Blue-Yellow-Green |
7,500 |
Yellow |
100,000 |
Blue |
500 |
Blue-Green-Red |
10,000 |
Maroon |
100,000 |
Red-Blue |
1,100 |
Black-Blue |
12,500 |
Purple-Yellow |
150,000 |
Black-Yellow |
1,100 |
Blue-Red-Black |
12,500 |
Purple-Red |
250,000 |
Red-Yellow |
1,500 |
Black-Green |
12,500 |
Red |
500,000 |
Black-Purple |
2,000 |
Blue |
15,000 |
Gray-Yellow |
800,000 |
Red-Gray |
2,500 |
Green-Gray-Red |
15,000 |
Gray-Green |
900,000 |
Green-Yellow |
3,300 |
Black-Green |
20,000 |
Black-Red |
1,000,000 |
Blue-Gray |
3,300 |
Green-Red |
30,000 |
Gray |
2,000,000 |
Green |