Here is the step-by-step procedure I use for restoring paper covered
metal can electrolytic capacitors. When these guys fail, your radio
will produce lots of hum, but little else.
The first step is to remove the capacitor from the chassis.
Next we separate the paper sleeve from the metal can. Use a thin
flat piece of metal like a nail file for this. Try and limit the
damage to one side so that it is easier to hide later on. You may
need to slice the paper open using a razor blade or X-acto knife.
Now cut the can in half using a hacksaw. Don't breathe the dust,
it is toxic!
Hollow out the bottom part of the metal can (you can discard the
top part). You need to get down to where you can see the metal
contacts coming through from the bottom.
Drill a small hole near each of the metal contacts and one near
one of the mounting tabs.
Assemble the replacement capacitors. Make sure the unit will fit
in the can!
Place some spaghetti on each of the leads that will pass through
the holes you drilled in the bottom.
Use some electrical tape to hold the unit together and place it
in the can, threading the wires through the holes. If the
various sections of the original unit had different values, the
replacement units will have different values too. Make sure the
leads from the replacements go through the correct holes. The
common negative wire will go through the hole near the mounting
Here is a bottom view of the assembly prior to soldering.
Mount the can back in the chassis, reattach the leads from the
circuit and solder all the connections.
Here is the top view before replacing the paper sleeve.
Here is what it looks like with the sleeve replaced. If you had
to slit the paper sleeve open to remove it, you will want to glue
it back together. In most cases, you can turn the sleeve so that
the joint is hidden.
Here is the finished look from below.