Shure Stratoliner 708A (crystal)

Taken from Shure's blog post on the history of crystal microphones:

"In 1940, the Model 708A “Stratoliner” joined a family of the Shure microphones with fanciful names that eventually included the Spher-o-Dyne, Rocket, and Monoplex. The airship (or zeppelin, blimp, dirigible) – inspired design of the Model 708A crystal microphone was shared with the ribbon Model 508 that also debuted that year. In addition to its sonic qualities, the Shure 1940 catalog touted the 708A’s good looks, stating that it also improved “the appearance of sound set-ups.” Production of these mics was suspended from 1942-1946 to conserve materials for World War II. The 708A was revived after the end of the war."

The Crystal Stratoliner was advertised in the Harry Reed catalogue of 1941, page E-15.

Taken from a 1941 Shure Data Sheet:

"Model 708A “Stratoliner” is a pressure-actuated diaphragm-type semi-directional crystal microphone with wide range response for high quality reproduction of sound. The crystal used is a grafoil (high capacity) bimorph unit, moisture-sealed to withstand adverse climatic conditions. The case is attractively streamlined for improved acoustical performance and modern appearance. The microphone is provided with built-in receptacle and 7-foot shielded rubber- jacketed cable with microphone plug attached."

The Stratoliner may be seen In Shure advertisements such as:

• Shure March 1941 MODEL 708A "STRATOLINER" CRYSTAL MICROPHONE Data Sheet
• Shure April 1941 MODEL 708A "STRATOLINER" CRYSTAL MICROPHONE Data Sheet
• Similar Variant - Shure 1942 MODEL 708S "STRATOLINER" CRYSTAL MICROPHONE Data Sheet

See an Xaudia blog post about the Stratoliner.