By the looks of it, I was the first person to do a repair on this amp! What an honor! Really, this thing was untouched since it came out from the factory. Even the tubes are the original, all of them!  After removing and opening the chassis it was obvious what needed to be replaced. Apart from the blown fuses, the polarity capacitor just gave up from age. It opened up and it shorted against the chassis/transformer casing.

The replacements.

And getting the job done!

The ground lug on the power cord was missing too, so it had to be replaced.

Old power cord.

The new one!

And done. This thing is a beast!!!