This has always been a problem accessory. 1st is try to find a original beacon top, there are plenty on Ebay. They work the best. Next is get a modern replacement top from me or Train Tender. The newest repo's. are made of lighter aluminum than older repops and work better. The current bulbs available with a dimple don't get as hot as the old GE 461 bulbs. They are rated at 14 volts, but to get enough heat they will need to operate at 16 volts. Finally where you live makes a difference. They work at sea level better than at 5000 feet. (like Denver).
Oh, and PS, the 494 beacon should make little if any noise at all. Try sprinkling a very small amount of powered graphite on the rubber driving washer.
