[Warren]

You can take the tubes to someplace in the area and test them. If it goes further than that you will more than likely need some testing equipment and some electronics knowledge to track down the bad component. Also remember that tube electronics have lethal voltages in them, you have to be very careful not to touch the wrong thing and be aware of saftey precautions. Is it very old? Older sets even if working need the old capacitors changed or they might explode either causing a transformer, etc to go out or even start a fire. If it is old you really shouldnt play it without the caps being changed.