A-256B
| Brand | Altec, Altec Lansing |
| Manufacturer | Altec Lansing Corporation |
| Function | Amplifier, Power |
| Produced | 1950 |
| Country | United States |
| Model ID | A-256-B |
| Form Factor | 19" Rackmount |
| Signal Path | Analog Hardware |
| Dimensions | 48.3 × 35.6 × 22.9 cm (W × H × D) |
| Weight | 60lbs |
| Power | 105/117/130VAC, 50/60Hz 200W |
| Frequency Response | 20Hz-20kHz ±1dB |
| Power Output | 75W |
| Gain | 50dB |
| THD (75W) | 2% |
| IMD (65W) | 8% |
| Noise Level (0.001W) | -45dB |
| Input Impedance | 500Ω (Bridging: 5kΩ) |
| Load Impedance | 4/8/16Ω |
| Output Tube | 807 |
| Tube Complement | 807 (x2), 6SN7 (x2), 6SJ7 (x2), VR150/OD3 (x4), 5R4GY (x2) |
| Output Voltage | 6.3VAC 0.6A, 300VDC 5mA |
| MSRP (1950) | $393.33 |
| Channels | 1 Channel |