[georgetownjohn]

Thanks Greg, your reassurance of using parts from the 620 is very helpful.  Since I am still new at all this, I will wait til the 620 chassis arrives before I start taking the 640 RF unit out and apart.  I still have the wires in the 640 labeled/numbered from the original restoration attempt so I am hoping the wiring layout is similar in the 620.  If I remember correctly, while taking the 640 RF/tuner section apart for the recapping, there are 3 divided sections similar to bulkheads on a ship.  The dividers are L shaped at the top and screw up into the top of the chassis.  If I am lucky, I will try to just remove the divided section that has the bandswitch and recap any caps in that section while I am at it.  Regards to all, --John
I do have 2 additional questions that you may be able to help with.
First, why does the 620 onl show 3 wires to the speaker while the 640 uses 4 wires.  Does it have anything to do with the fact that the 640 has push-pull amplificaton and the 620 does not? 
Second, I have read where Philco was notorious for making errors in part numbers.  So I wonder if I can still use the tuning capacitor from my 640 regardless of the bandswich I will use.  The front of my 640 tuner bracket capacacitor has 640 stamped on it from the factory but the part numbers for the tuner are different for the 620 vs the 640 in the respective parts lits!