The vacuum tube assemblage in model form.

"He [Marty] paused and frowned in at the mass of wires and vacuum tubes that now was mounted on the hood of the DeLorean. That, and the big fifties-style tires that Doc had mounted on the car to replace the ones that had shredded with age, made the DeLorean look like one of those so-called 'funny cars' Marty used to see when he went down to the Hill Valley Speedway."
—From Back to the Future Part III by Craig Shaw Gardner (quote, page 34)

Vacuum tubes were used on the third version of the DeLorean time machine, after Dr. Emmett Brown and Marty McFly recovered it from the Delgado Mine in 1955.


To replace key parts from 1985 that would have existed in 1955, including the destroyed time circuit control microchip, Doc worked from the schematic diagram included with the repair instructions to fashion a box-frame unit that was attached with straps to the hood of the car, which included a vacuum tube assemblage that helped control the time circuits.

Vacuum tubes had also formed part of the assemblage of one of Doc's earlier 1955 inventions, the brain-wave analyzer.[1]

Behind the scenes[]


See also[]