I was able to locate a number of these little dudes online (amazon.com) and picked them up for future projects. In the table below, all values in the primary are relative to the black tap (blk).
Color Resistance Inductance XL @ 300 hz Rounded Value White (WH) 1424.3 ohms 24 H 45.239k ohms 40k ohms Gray (GRY) 886.4 ohms 12.04 H 22.694k ohms 20k ohms Violet (VIO) 516.5 ohms 6.06 H 11.423k ohms 10k ohms Blue (BLU) 260.1 ohms 3.04 H 5.730k ohms 5k ohms Green (GRN) 81.8 ohms 1.565 H 2.950k ohms 2.5k ohms Yellow (YEL) 56 ohms 787 mH 1.483k ohms 1.2k ohms Orange (OR) 38.2 ohms 398 mH 750.2 ohms 600 ohms Red (RED) 26 ohms 197 mH 371.3 ohms 300 ohms Brown (BRN) 18.2 ohms 98 mH 184.7 ohms 150 ohms Pink to Pink 0.5 ohms 5.23 mH 9.86 ohms 8 ohms
I plan to use one of these to get the B+ voltage from my National SW-3 off of the headphones and to provide an impedance match to a more typical 8 ohm speaker or headphone.
I also found a nice transformer P-T31 at Antique Electronic Supply that does 5k to 8 ohm impedance. These were about twice the price and no taps on the primary.