I appreciate all the comments and have applied them to the issue. I
fired the transformer up and it does function, generally as expected.
The B+ bridge type winding puts out about 350v, unloaded. I expected
the one of the two filament windings (green) to be 5v but they both and
put out over 6.9v unloaded. The green winding puts out a good 6.5v with
a 5v rectifier tube filament wired to it, so it must be a healthy 6.3v
winding, instead. The outrider wire on the primary winding appears to
color code out as a "primary tap", using the link provided by Cmdr.
Buzz. Maybe the extra wire is, indeed, a 220v winding. If I could
remember from whence it came??? Again, thanks to all. de K3HVG



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