Model/Circuit Number: MK I (Tweed Bassman 5F6-A Clone) Years of Production: 1962 Era: Offset Chassis Configuration: Head and Ext. Cabinet Controls: Polished Aluminum w/ Black Lettering Knobs: Faceplate Front: Polarity Switch, Power Switch, Standby Switch, Indicator Light, Presence, Middle, Bass, Treble, Volume 1, Volume 2, Channel 1, Inputs 1 & 2 Rear: Speaker output 1, [...]