Sennheiser MKH-105 (1963)
Documentation on the Sennheiser MKH-105 is thin. The record has this much. EQ Magazine (August 1997, p.29), in a retrospective on early RF condenser microphones, lists the MKH 105 as introduced in 1963. It is a solid-state RF condenser with an omnidirectional polar pattern and a frequency range of 20 Hz to 20,000 Hz. The same piece calls it one of the first RF-type condenser microphones.
A later operational assessment in Recording Engineer (February 1986, p.122) describes the small unit as attractively styled and crafted. It measures 25 mm (one inch) in diameter by 150 mm (six inches) long, and the announced Sennheiser price was $685.
Past these two entries, almost nothing survives in the period literature. Production years, lineup context and market history are not documented.
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