From the 1967 Vox: it's what's happening brochure
A tremendous new four string bass guitar! The Delta IV is a four string with the famous solid body Vox Phantom shape. Has built-in G tuner, distortion booster, treble and bass boosters. Has an all new fast and easy to fret neck, with double T-bar and adjustable truss rod. Has two exclusive Vox Ferro-Sonic high output wide range pickups. Has one volume, two tone controls. Jumbo chrome plated machine heads.
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