M400SM
| Brand | Mellotron |
| Function | Synthesizer (Tape-Based) |
| Produced | 1970-1986 |
| Country | UK |
| Form Factor | Tabletop |
| Signal Path | Analog Hardware |
| Weight | 120lbs |
| Links | Manufacturer Page · Sound on Sound Review · Mellotron Model Info Page |
| Notes | Returning to the 3/8-inch format, the 400 was lighter and more robust than its predecessors. 100 were built under licence by EMI. Mellotron Revision Dates 1970 (M400) 2007 (M4000) 2010 (M4000D) |