[Arran]

I believe that you meant that this was a 46-1201 Code 126, not a run 126, the run numbers were stamped on the chassis and I've never seen one higher then Run 4. I think I may have the info for a 46-1201 code 126, the code numbers on the 46-1201 ran from 121-128, probable more then I have heard of for any other Philco model. In spite of the model number they were not all made in 1946, they made 46-1201s until 1948 then updated the circuit to employ a higher B+ voltage.
Regards
Arran