Grundig GDM 308 (1979–1982)
The GDM 308 is a dynamic omnidirectional microphone from Grundig, made in Germany for reporting and dictation use. It was produced from roughly 1979 to 1982. One source suggests these microphones were especially popular in broadcasting during the 60s and 70s, though that likely refers to the broader type rather than this exact model. The mic has a start/stop switch for cassette recorders and an integrated 1-meter cable ending in a 7-pin DIN connector. Some listings sell it under the "Record" name and others under "Report". The German description calls it a dynamic microphone for dictation machines.
Documentation on the GDM 308 is thin. No original price, frequency response or sensitivity figures appear in the archive's sources, though one classified listing gives an 80 Hz - 15 kHz range and 700Ω impedance. A period data sheet covering the GDM-308 alongside the GDM-314 and GCM-309 is known to exist (dated 1979), but nobody has transcribed its contents. The microphone turns up occasionally on the secondhand market. One Reverb seller called it "very rare" and in perfect condition, while an eBay UK listing described it as cosmetically good but untested. A German classified ad listed one at €10 in 2023.
Known specifications:
- Type: Dynamic, omnidirectional
- Connector: 7-pin DIN (integrated 1 m cable)
- Controls: Start/stop switch for cassette recorders
- Frequency range: 80 Hz – 15 kHz (per one classified listing)
- Impedance: 700Ω (per one classified listing)
- Made in Germany
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