[jerryhawthorne]

Tank, if your speaking of the grid cap on top of the tube, they are often easily saved if you have a little bit of the wire coming through the top of the tube left. If you do, clean it well and select some small diameter solid wire and tin it and turn a tight loop around a jewelers screwdriver. Slip over the piece coming out of the tube. A little solder flux on the assembly and a touch with your soldering iron and a little solder and you should have a solid connection. Drill a small hole in the top of cap. large enough to feed the wire through.
A dab of crazy glue on the rim of the tube cap and slide the cap down the wire and let it set up on the glass top of the tube.
After drying, a dab of flux on the extended wire and cap and again, a quick touch of the soldering iron to the cap and wire. Quick as you don't want to melt the solder holding the wire in place on the tube.
Your done!
Good luck Jerry

PS: You might wish to check the filament of the tube prior to this.