Motorists driving past the Tullahoma Utilities Board (TUB) office on South Jackson Street will see a crew install a new electronic sign in front of the building. The utility decided to upgrade the sign it installed last spring to a higher-resolution model. Last week TUB sold the 5-by-8.5-foot sign to the City of Winchester for $19,600, a sign that according to Brian Skelton, the utility’s general manager, the utility spent $50,000 to buy the sign last March, and it has been operating in front of the office for roughly two months. Upgrading the sign will cost TUB an additional $25,000, but the TUB manager says the new total cost of $75,000 still comes in below the original $100,000 estimate. The purpose of the sign, the general manager said, is to promote TUB and the services the utility offers, particularly LightTUBe television, Internet and telephone services.