How many capacitors did you replace? What is the model number? You should be able to get a loud hum out of the amplifier if you touch the center terminal of the volume control. If not, then there may be amplifier trouble. If the amplifier is working well, then the RF section either needs an alignment or some part in the RF section needs attention, such as a resistor, tube, or RF transformer (IF transformer, antenna, etc., ...most likely IF transformer), and possibly a capacitor needs attention if you didn't replace any capacitors in the RF section. If the radio uses ceramic disc capacitors, they almost never fail, so you should test them for shorts and replace them only if necessary.
T.