SIC 3671 Electron Tubes

Encyclopedia of American Industries | 2005 | Copyright

SIC 3671
ELECTRON TUBES

This category covers establishments primarily engaged in manufacturing electron tubes and tube parts. Establishments primarily engaged in manufacturing X-ray tubes and parts are classified in SIC 3844: X-Ray Apparatus and Tubes and Related Irradiation Apparatus; those manufacturing liquid crystal displays (LCDs) are classified in SIC 3679: Electronic Components, Not Elsewhere Classified; those manufacturing computer terminals are classified in SIC 3575: Computer Terminals.

NAICS Code(s)

334411 (Electron Tube Manufacturing)

Industry Snapshot

The number of companies engaged in this industry in the late 1990s totaled 158, down by 15 percent from the number of firms in the early 1990s. Yet these establishments generated just under $3.8 billion in shipments in the late 1990s, a 19 percent increase over the value of shipments in the early 1990s. Shipments in 2000 declined to $3.56 billion. The industry employed 16,187 individuals in 2000, down considerably from 21,656 in 1997. As a result, total payroll costs over the same time period decreased from $726 million to $633 million.

Over three-fourths (76 percent) of the value of industry revenues in the late 1990s was derived from the production of new and rebuilt receiving-type electron tubes such as TV and cathode-ray tubes, up from only 61 percent in the early 1990s. The second major product group, accounting for 17 percent of the value of late 1990s shipments, consisted of transmittal, industrial, and special-purpose electron tubes (except X-ray tubes). This represented a decline from 31 percent of total industry revenues earlier in the decade.

Organization and Structure

The two most recognizable types of electron tubes were the ordinary television and computer tube and the once common vacuum tube traditionally used in radios and other electronic equipment. Generally speaking, electron tubes were sealed glass, enamel, or metallic tubes of varying sizes into which electrons were fired for the purpose of displaying images or conducting, transmitting, or multiplying light for nondisplay purposes. Although television tubes and computer displays were the most common products, industry firms also manufactured camera tubes, microwave tubes, Geiger counters, radar screens, and such specialized devices as electron beam (beta ray) generator tubes, klystron tubes, magnetron tubes, planar triode tubes, and tubes for operating above the X-ray spectrum.

Electron tubes varied according to the extent to which they were "evacuated," or emptied, of gases and vapors; by the capability and type of the electron source; and by the number and configuration of electrodes they contained. The amount of power used in electron tubes ranged from...

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