Rookie needs help please: wiring the Hammond 266M2 for CT (2.5V CT)

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Hi all,
Have been using the 266M2 with the 1.25V secondaries in series and deriving my CT using the usual resistors/ humpot method. Now, I’d like to dispense with the resistors and humpot and use the transformer’s CT... without killing our cat (or me!).
Should I:
a) Wire in series, but connect the 1.25V – 0V series connection point to the top of the cathode, OR
b) Wire each of the 1.25V wires to a filament pin and connect both of the 0V wires to the top of the cathode circuit?
The transformer datasheet/ instructions don’t explicitly identify which wire is which. Am I correct in thinking that the yellow and blue wires are the 0V and the grey and red are 1.25V?
Any assistance would be greatly appreciated.
Edit: added a more likely option?

"In the beginner's mind there are many possibilities, in the expert's mind there are few." Shunryo Suzuki

Edits: 04/05/14

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Topic - Rookie needs help please: wiring the Hammond 266M2 for CT (2.5V CT) - RC Daniel 22:07:36 04/05/14 (4)

RE: Rookie needs help please: wiring the Hammond 266M2 for CT (2.5V CT) - drlowmu 22:28:03 04/05/14 (3)

Thanx Jeff, but just to be extra sure... - RC Daniel 01:22:36 04/06/14 (2)

RE: Thanx Jeff, but just to be extra sure... - Tre' 07:37:35 04/06/14 (1)

Thanx Tre - that makes sense to me. nt. - RC Daniel 15:38:48 04/06/14 (0)

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