VALCO MANUFACTURING COMPANY
TWO GUITAR AMPLIFIERS, CHICAGO, IL
SUPRO S6606, circa 1966, height 11½ in. (29.2 cm) - THUNDER BOLT S6420, circa 1966, bearing the logo Supro, height 19 in. (48.3 cm) (2)
VALCO MANUFACTURING COMPANY
TWO GUITAR AMPLIFIERS, CHICAGO, IL
SUPRO S6606, circa 1966, height 11½ in. (29.2 cm) - THUNDER BOLT S6420, circa 1966, bearing the logo Supro, height 19 in. (48.3 cm) (2)
