It is extremely important to never, ever plug in an old radio, TV, or any other electrical or electronic apparatus that has not been in use for many years.  You could cause irreparable damage to the equipment and face serious injury to yourself if you do this. 

Old radios and TVs need to be thoroughly checked out by a competent technician before you apply power to them.  It is very easy to destroy an old set by just simply plugging it in to see if it will work.  Even power applied for a very short time could cause severe harm to an old set. 

So please, don't plug in any old radio or TV without a complete checkout, otherwise you might have a fancy fireworks show for about 4 seconds, but destroy a collectible and irreplaceable set in the process.