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Oh no, I would not put a larger fuse than specified in a piece of equipment that is designed from the factory from a fuse...the only time I have increased the fuse rating is when I am retrofitting one into a set that doesn't have one and trying to find the best fuse rating. The time I have had the fuse blow after a 1/2 hr I was using a fast-blow fuse very close to the actual current draw when I was experimenting with the ideal fuse rating to add to a non-fused set.
Yes you are right, the round sets usually just used the circuit breaker in the power transformer secondary winding plus perhaps fusible wires for filament protection...no primary fuse.
The later RCA tube consoles like CTC-39 I remember as using the 7 amp fuse.
Also the later RCA tube portables like ctc-52 use a thermal fuse that is mounted near the HO tube to detect overheating, some of the earlier color portables run the HO cathode through a thermal circuit breaker that will open the ac line.
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