HAVE A LIKE NEW GB4000 WITH M.O.P.A. TUBE AND AMPLIfIER AND ALL THE OTHER STUFF TOO. USED VERY LITTLE FOR SOMEONE THAT HAD CHRONIC LYME DISEASE. WAS VERY EFFECTIVE FOR THAT. FIRMWARE WAS UPDATED IN 2012. PLEASE EMAIL IF INTERESTED FYI I AM LOCATED IN NORTHERN CALIFORNIA. THIS MODERN DAY DESIGN WITH M.O.P.A. TUBE IS CONSIDERED BY MAJORITY OF EXPERTS TO BE MOST LIKE THE ORIGINAL RIFE EQUIPMENT.