popping the fuse right at start up, with no tubes installed.
At first, make a current limited power supply, inserting a series lamp (Filamentary, not led nor fluorescent), making an extension cord, or with two crocodiles, and replacing the fuse with the lamp. So you will stop blowing fuses unnecessarily. The lamp must be more or less twice the power expected to consumed by the DUT. Without tubes, it must not light or at most, a brief flash when charging the 'lytics of the rectifier sector, but post this flash, lamp must be almost dark.
should i get an ohm reading between the 6.3 and ground? i see about 9.25k.
i finally got a couple tools and pulled all of the all the secondaries and it still popped.
Which material is made the fuse holder of? Sometimes Bakelite becomes carbonized and then, conductive. Perhaps it is the same fuse holder that is blowing the fuse.
Take a good picture of the fuses you are using and post it here. There is a chance that they are it.