| Form Factor | Part |
| Signal Path | Analog Hardware |
| Dimensions | 5.7 × 11.2 × 25.4 cm (W × H × D) |
| Weight | 4.5lbs |
| Power | 6.3VAC 1.2A, 270VDC 70mA |
| Frequency Response | 20Hz-20kHz ±1dB |
| Gain | 50dB |
| Source Impedance | 30/50Ω, 125/150Ω, 250/300Ω, 500/600Ω |
| Load Impedance | 125/150Ω, 500/600Ω |
| Output Level (Line) | +30dBm |
| Output Level (Monitor) | +39dBm |
| Output Level (Monitor) | 8W |
| THD (Line, +30dBm, 30Hz-15kHz) | 0.5% |
| THD (Monitor, +39dBm, 50Hz-15kHz) | 1% |
| Noise Level | -60dBm |
| Tube Complement | 12AY7, 6AQ5 (x2) |
| Links | Altec 250A Console |
| Notes | A-429B with minor component changes and changed model number to fit with revised nomenclature structure.
250A Console plug-in module. Available separately for custom installations. |
