[Electrothaumaturgist]

After a thorough check of photos, sketches, schematics, and with soldering iron at the ready, I have concluded and made an executive decision that the mystery box is an add on repair, and it will be decommissioned, as my new 3k (3.3k) resistor and restuffed .25 will go to the 2 leads at the choke, and the wire going to the 3 lug area will be removed. (I misspoke when I said the wire from 6r7 was incorrect. it IS correctly going to the center chassis lug). I was fully prepared to unsolder the whole mess and start over. Happy to report I don't have to do a thing, except to remove the wire for the mystery box!   I have been up close and personal with all the components and have accounted for each piece and matched it with the schematics and am confident that this does not belong. That old box does look like it has universal mounting holes on the bracket. It does, however, have very nice flexible cloth covered wires on it. I may take my electrolytics apart again and replace the modern wires with those!