Search for Hammond 266F6. Mind you, it is not cheap.
http://www.mouser.com/ProductDetail/Hammond/266F6/?qs=AeBljyeJo%2bjfPTTvkRNwsg==
Do you actually need the center tap? If not, see if you can find an inexpensive transformer with a 12 volt center tapped secondary. Connect two diodes across the 12 volt leads, back to back, so to speak. Your 6 volt
fluctuating d.c. across the center tap and the joint of two diodes will give you a reasonable source for a 6 v.a.c. filament. I don't have a working scanner at the moment so can't post a diagram.
The problem here is that I need 3.15vac. That is why I want a 6.3vac center tap. The best one is with Hammond. 110vac dual primary, dual secondary of 3.15vac courtesy of Mr. Chips.Or how about an old ?-14-X Triad, 117V 60 C.P.S. Fil 6.3C.T.@1.2A, for $ 5.00, postage paid. Punch up Bernard to send a message.
I am making a curve tracerAs a matter of interest, what is the 3.15V AC for?
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