Hi guys; my first post.  I have here a Classic VT series 100, 2 tube 50 watt.  Was a combo, someone cut it to a head.  I was asked to repair it. I have read many posts about blowing fuses, and checked many components including all diodes.. Can't find the problem. I have less of a legit troubleshooter, more of a 'check for breaks' education.

The preamp board has a couple ugly repairs, a few off-value E caps. C10 350V is leaking and reads 15 microF.

One of the large power board 100 microF Ecaps reads .39 nanofarad. That seems a bit too far out of range.
With tubes out, the input power fuse blows immediately.

I dont want to throw parts at this thing since it isnt mine.
Can someone help?