I ADD LINE FUSES WHERE POSSIBLE. THE POWER SUPPLY IS CRITICAL. YOU DON'T WANT A FILTER CAP TO GO SOUTH (YOU DID REPLACE THEM, RIGHT?) AND WIPE OUT THE POWER TRANSFORMER.
WITH A TRANSFORMER SET, NOT ONLY DO YOU WANT TO FUSE THE B+, YOU ALSO WANT TO FUSE THE PRIMARY. IF YOUR SET IS AN INSTANT ON, THIS IS EXTREMELY CRITICAL.
REGARDLESS, YOU NEED TO FUSE YOUR SET. THE COST OF FUSES AND FUSE HOLDERS IS FAR LESS THAN THOSE HARD TO FIND PARTS.
I WILL ADD PICS AND SAMPLE SCHEMATICS WHEN MY WORKLOAD EASES.