677A
| Brand | Altec, Altec Lansing |
| Manufacturer | Altec Lansing Corporation, LTV Ling Altec, Inc., Ling-Temco-Vought, Inc |
| Function | Microphone |
| Produced | 1966 |
| Country | United States |
| Form Factor | Handheld / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 2.3 × 2.3 × 3.6 cm (W × H × D) |
| Weight | 0.06lbs |
| Frequency Response | 70Hz-12kHz |
| Element Type | Moving Coil Dynamic |
| Diaphragm | Polyester |
| Directivity Pattern | Omnidirectional |
| Output Impedance | 150/250Ω (Selectable) |
| Output Level | -58dBm/10dynes/cm² |
| Hum (Ref.: 10⁻³ Gauss) | -120dB |
| Finish | Dark Green |