Colour codes for the kit resistors

1.2k ohm is brown, red, red, gold. 39k ohm is orange, white, orange, gold.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7
• Williams System 9
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• Spare diodes, capacitors and resistors for System 3-7

Source: Williams Systems 3 - 11c High Voltage Parts Kit