The primary, is that the part of the tranny that connects to the AC line? If so its already fused.
Could I double up a fuse and install it in series with the B+ line?
Its my plan to completly re-cap the waxed capacitors. I know that this Tv is running only at 50% of what it truly could do, and it could fail at any time. If its not up to par after re-capping the waxed caps than the filters are getting replaced. Phil Nelson has a great capacitor replacing page on his website. I hope you don't mind, Phil, if I post the link. I think its helpful during this discussion.
http://antiqueradio.org/recap.htm
With my other projects I have replaced the electrolytic capacitors. With this set I don't see a reason what one would short out. I've reformed them, and they don't run hot durning full voltage use. What would cause a instantanios short?
Waxed caps are a different story. I've had more than one blow up before! Sure gives you a good look of how it was constructed!
Cheers!
Matt Davala