Be sure to add me to your favorites list Sony 3 Volt Power Adapter Model AC-330 for Some Vintage Cassette Walkmans, 3V 300mA Small Plug, (-) Polarity Very lightly used and great working Sony 3 VOLT AC Adapter / Charger, model AC-330, for several Sony audio units and possibly other brand units that need these specs and plug size. This is an older model from the 1990's, for vintage 80's / 90's recording Walkmans and other units that need this size plug with a negative (-) polarity tip plug. Item Details: Brand: Sony Model: AC-330 Rated Output: 3V DC AC Power Adapter for cassette recorders, minidisc, Walkman, AM / FM Radios and other units INPUT: AC120V 60Hz 5W OUTPUT: DC3V 300mA (-) polarity tip Small barrel type plug Thanks for looking! Check out my Store!