There are seven vacuum lines only six are used, looking from the back of the unit going left to right ,bottom four 1.Dark Green,2.Red,3.Violet,4. sealed[ not used],top 3,5.Brown,6.Yellow,7.Light Green
There is no official "standard" for audio systems. As long as you stay consistent throughout the system, it will work properly. It is a little known fact that most electrons are color-blind :-)
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