Paul
Resistance between 1 and 2 is 84 ohms. Chassis ground to 1 or 2 is infinite. I've looked at those connections several times and compared with manual pictures and see no deviation. I guess its possible I may have burned the iec terminal but it shows no signs of that.
Bingo!
The transformer is in backwards. There are terminal numbers embossed on the bobbin, which are repeated on the label. You can check to see if the label was correctly applied, or if the transformer was wound with an upside down bobbin.
Remove all the connections to the transformer and remove the transformer from the chassis. On the work bench, rotate it 180 degrees so that it is in the correct orientation. Then check winding resistances to see if there is any damage:
Terminals 1-2 (formerly 9-10) should be 13 ohms
Terminals 4-5 (formerly 6-7) should be very low, less than an ohm
Terminals 6-7 (formerly 4-5) should be 84 ohms
Terminal 9-10 (formerly 1-2) should be 84 ohms
Then confirm that none of the four windings are connected to any of the others or to the core. This is kind of laborious, and I don't anticipate any problems, but let's be sure before re-installing the transformer!
If it's good, then remove and rotate the label so that it identifies the terminals correctly. If the embossed terminal numbers are incorrect, send us an email so we can trace the problem, hopefully to a particular batch of transformers, and so we can alert our supplier to the error, and prevent it happening again.
Now you can re-install the transformer and re-connect the wires.
It's probably a good idea to check the heater resistances of the tubes before firing it up, since what caused the fuse to blow was applying 160 volts to the 6-volt heaters (!) That would be pin 7 to pin 8 on the 6080, pin 9 to pin 4 and pin 9 to pin 5 on the 12AU7. I don't expect a problem, but again, let's be sure first.