Here I am again 
When connecting the heater wiring the manual states to connect terminal 7 and 9 of the transformer to B7 and B8 of the octal socket. As the the 2 wires are twisted together, it is hard to know which wire is which. Is there any order of which wire connects from the transformer to the octal socket. Ie terimal 7 to B7 or does it not matter what wire is connected to what?
Thanks.

When connecting the heater wiring the manual states to connect terminal 7 and 9 of the transformer to B7 and B8 of the octal socket. As the the 2 wires are twisted together, it is hard to know which wire is which. Is there any order of which wire connects from the transformer to the octal socket. Ie terimal 7 to B7 or does it not matter what wire is connected to what?
Thanks.