Red Vox version with germanium transistors
Red Vox version with silicon transistors
Silver Thomas Organ version with silicon transistors (schematic in this post)
http://www.voxshowroom.com/uk/misc/boosters.html#153 Distortion Booster - The #153 JMI Vox Distortion Booster "fuzz tone" was also introduced in the November 1965 JMI Vox price list. The steel case sported a dark red painted finish. The booster utilized a battery operated gain circuit driven by two silicon transistors and featured a three-pole power switch that offered true signal bypass. The UK retail price in 1965 was 4£ 4s. The #153 Distortion Booster provided a less costly alternative to the germanium transistor powered JMI Vox "Tone Bender" fuzz tone.
Thomas Organ produced the nearly identical but chrome plated V816 Vox Distortion Booster for the North American marketplace. Like the V806 Treble Booster and V810 Bass Booster, the Thomas Organ eliminated the true signal bypass feature in the V816 Vox Distortion Booster as a cost saving measure.