I am currently rebuilding a toroidial transformer from an old Cambridge audio amplifier/receiver. This toroid supplies the +5 V and +/-15 V rectifiers for op-amps etc. The fault was the typical blown thermal fuse on one one of the split primary legs for the 100 V/115 V input.
So far I have installed the new fuse and rewound the 1st secondary (single wind for 12 VAC which runs the 5 V DC PS). I was about to start the 2nd split secondary when I came across a YouTube video on the phase issue. Now I think I would be correct in assuming that the phase is not an issue when it is just feeding rectifiers for DC PSs... anyone correct me here if I am mistaken.
Now here's my conundrum: I didn't bother to pay attention to the split secondary windings direction as I removed it. I started with one bobbin on the 1st winding end that seemed to want to come off 1st and easy... until I got a ways into it and found the wire from the other end was overlapped/crossed over, so I had to start a second bobbin and proceed in the other direction.
Long story short... question: can I wind the 1st leg around until it's done, then join the 2nd leg to the 1st for the CT and wind in the same direction on top of the 1st OR?
Should I make the CT and go in the opposite direction again over top of the 1st?
Or should I start the 1st leg and go say halfway round, stop and start at the CT jion with my 2nd bobbing going in opposite direction?
And one more issue: phase. I'm pretty sure I have to wind both legs in the same orientation ie. if I start 1st leg with the end pointing up and go under come up through and over and so the 2nd leg would have to match that same direction. Correct?
Otherwise, in my understanding, if I get it mixed up my phase will be opposite on each leg with reference to the CT. Am I correct?
Any help would be appreciated.