The LL1527 will work, but there are other more suitable transformers in the Lundahl catalog. The LL1592 is the best choice with a mu metal core and the LL1690 is the best with a cobalt amorphous core. These can be used 1+1:1+1 and 1:1+1 (with the primary coils in parallel) for phase splitting.
Whichever you use, do try to optimize the loading, taking into account the input and Miller capacitance of the 6SN7 and the source impedance of your preamp. Usually, diddling the value of the resistive load on the secondary and/or using a Zobel will greatly clean up the time domain behavior.
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