I just purchased a sanyo m7770k boombox. Based on conversations and looking online I have bought 3 diffrent sets of dc 9v barrel type tips and none of them fit snugly. I just need the connector tip. Does anyone know the exact size of 9v dc barrel connector to fit in a sanyo m7770k boombox? The size that goes around the pin. ( For example 5.5mm x 1.7mm).