Leave it to Queen of Collectibles Dana Cain. When her boyfriend, artist Peter Illig, was scouring estate sales for vintage stereos, she was inspired to create the Vintage Voltage Expo. "It's sort of like a cross between a vintage guitar show, a record show, an electronics flea market, an old audio store and a radio swap meet," Cain explained last year. The first Expo was a complete success, featuring approximately 75 vendors and a contest area where collectors could show off pieces to win "voltage bucks." Turntable demos and talks on subjects such as Nikola Tesla were also part of the mix. This year's Vintage Voltage Expo is scheduled for Sunday, March 30, at the Ramada Plaza Convention Center in Northglenn.