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Bally color code.

1  Red
2. Blue
3. Yellow
4. Green
5. White
6. Brown
7. Orange
8. Black
9. Grey (gray if you prefer)
The pneumonics are "Red blooded yankee girls wear brown or black garters."

0.  Means it is a solid wire, and there is no trace.  Solid wires often carry voltage other than signals.  10 means a red wire with no trace. 20 is a blue wire with no trace, generally your 6V light feed.  70 is a solid orange, which is your 50V feed, or source.

All wires have minimally 2 digits.  If it's solid, there is a 0 at end.  If it has a trace, the 2nd digit is not a zero. The body color is the first digit, and the trace is always the 2nd digit.
A dash ( - ) after the wire denotes its next re-use.  For example, on a schematic a 93-1 wire is not the same wire as a plain 93.  So be cautious, often Bally had to use the same color wire for different circuits, although I don't know that they used any solid wire ( 0 ) as a duplicate.  Expect a solid wire to remain true.