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I have found that using a fuse too close to the actual current draw of the set will cause the fuse to heat up and eventually open after a period of a half hour or so. This has happened when I have retrofitted horizontal output circuits and the ac line of old equipment. Using a 250 ma fast acting fuse in the 6JE6 cathode circuit opened after about 1/2 hr even though current was set at minimum for the set. A 300 ma fuse seems to work fine.
RCA usually used a 7 amp line fuse on their consoles at about a 300-325 watt draw off the AC line, the portables had a 5 amp fuse with a wattage of about 225-250.
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