Hello,

I have a R-646 radio. Not sure of the schematic I have found here. I found the 710-715 schematic were tubes alignment is the same that my radio. Is that correct?

Thank you!

From what I can tell from my manuals - you're correct, the schematic is for the chassis type 710 - which is what is used in the R-646 - sometimes the metal plate on the back of the chassis will indicate both the model number and the chassis type in two separate boxes.