French Mazda code
Two letters folowed by three
or four figures
| 1st letter
- heater voltage |
A |
1V |
| B |
2V |
| D |
4V |
| E |
5V |
| F |
6V |
| G |
7V |
| 2nd letter
- heater current |
W |
0.2A and above |
| X |
0.15A |
| Y |
0.1 to 0.14A |
| Z |
0.05A |
| 1st two figures |
Amplification
factor (single digit if <10) |
| Last two figures |
Internal resistance
in kilohms |
|