Never mind these things happen sometimes.
As Joe says nothing to loose now so you can use this as a chassis to learn on, even if it works they'll be a few caps to change, mains to rewire etc and hopefully a simple fault or two to find.
Follow Paul's guide or a book and have a go, why not? And there's plenty on here willing to help.
And if you get it going you will probably find a new cabinet one day.
Enjoy!
