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We have never had any problems with using the old capacitor leads to attach the new one to. I always file the end of the old lead so a good connection is made, and add heat shrink tubing or spaghetti to the lead if needed for insulation. This method avoids the heat/physical stress on old terminal strips, tube sockets or coils that can be caused by completely desoldering all the old leads.
Also always make sure you put a fuse in the AC power circuit if there is not one already. You can put an in-line fuse holder or mount a fuse clip under the chassis.
If a short occurs in an un-fused set, serious damage to the set can occur...the house circuit breaker will likely not trip on the overload and the current can flow until the 5U4 tube literally melts or the power transformer is charred. A 3 to 4 amp fuse is probably good for an old TV.
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