Sennheiser MKH-405
Not much is documented about the Sennheiser MKH-405. A period profile of the related MKH 404 dates that model to circa 1972 and lists it as an RF condenser cardioid with a 40 Hz to 20 kHz response (EQ-Magazine, May 2001, p.38). The most concrete reference so far is a figure in the Audio Cyclopedia: Fig. 4-7, which plots frequency response and manufacturing tolerance for the "Sennheiser Model MKH405 capacitor microphone," reproduced in Audio-Collection (p.185).
That much is solid. The 405 was a condenser (capacitor) microphone from Sennheiser's MKH range, and the manufacturer published response and tolerance data for it. Beyond that, the record is thin. No production years, original price or full specification sheet have been located so far. A manual, box or period literature for the 405 would fill one of the archive's gaps.
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