[GarySP]

Oops! Just realized you may have been inquiring about the wattage to use in a dim bulb tester. Rule of thumb is to use a bulb with wattage 1.5 to 2.0 times greater than stated wattage on the chassis identification plate. If you don't have that information, try subbing bulbs until the lamp glows dimly while the radio is operating. Too low a bulb wattage and it will glow brightly without the radio operating. I would start with a 75 watt bulb. A good tutorial can be found online. Type in "dim bulb tester", then open the "powering your radio safely with a dim - bulb tester". Personally, I would invest in a Variac for powering up a radio instead of a dim-bulb tester. Hope this helped. Gary