[Dennis Craft]

about the 1600 volt capacitor, if this is a typical home radio, a capacitor with this high voltage rating is not necessary.  if this is a transmitter or other kind of commercial gear, then maybe you need this voltage rating. sounds like someone put a buffer capacitor in the set. these were used primarily in car radios across the power transformer winding to assist in maintaining the stability of the vibrator-transformer circuit.  they may have been used in some television circuits as well 

you are safe using the 600-630 volt rating capacitors for most everything.