Model Forty
| Brand | KLH |
| Manufacturer | KLH Research & Development Corp. |
| Function | Tape Machine |
| Produced | 1968 |
| Country | United States |
| Signal Path | Analog Hardware |
| Dimensions | 40.6 × 36.6 × 18.3 cm (W × H × D) |
| Weight | 60lbs |
| Frequency Response | 45Hz-20kHz ±2.5dB |
| Speeds | 3¾ips, 7½ips |
| Wow & Flutter | 0.1% |
| SNR | 68dB |
| Noise Reduction | Dolby |
| Input Impedance (Mic) | 200kΩ |
| Maximum Reel Capacity | 7" |
| Tape Heads | Three |
| Motors | Three |
| Drive | Belt |
| MSRP (1969) | $650 |
| Channels | 2 Channel, 4 Track |