Well the following are 12vdc 3 amp linear regulators in TO-3 package:
78H12
NTE933
and lambda sometime ago use to have a 12vdc 5 amp regulator in a TO-3 package that you can sometimes find sold as new old stock:
Lefty
Well the following are 12vdc 3 amp linear regulators in TO-3 package:
78H12
NTE933
and lambda sometime ago use to have a 12vdc 5 amp regulator in a TO-3 package that you can sometimes find sold as new old stock:
Lefty