02-12-2009, 01:54 AM
Most battery type tubes from the thirties and forties are fairly inexpensive, barring anyone changing tube sockets, putting it back to original is mostly a matter of following the original 643 schematic step by step and replacing the resistors and condensers one by one along with the wiring. I would be surprised if the coils were changed.
Best Regards
Arran
Best Regards
Arran