FOR THE RECORD - Nov. 12, 2008

Groove Tubes: An article in Business on Saturday about the closure of the Groove Tubes factory, which made vacuum tubes in San Fernando, described solid-state technology as having no moving parts and said that it made tube manufacturing a harder sell in the 1950s. “Solid-state technology” refers to the movement of electrons within solid materials, as opposed to the movement of electrons through a vacuum, as in the case with tubes. Neither, however, has moving parts, such as mechanical switches.