Mike,
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Wouldn't it be ~27VAC across the winding (11 and 13)? Or ~13.5VAC at both 11 and 12 and 13 and 12?? For a center tapped full wave rectifier Vout = Vp (sec)/2 - diode drop.? Since the center tap is -12.6V and you have 6.0VDC at the output, if we make -12.6V ground, you have Vout = 18.6VDC.? (18.6 + ~0.7)x2 = 38.6Vp.? 38.6 x square root 2 = 27VAC in rms across the winding from pins 11 to 13. Or am I missing something?
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-Frank?
Frank Mashockie