| Form Factor | 19" Rackmount |
| Signal Path | Analog Hardware |
| Dimensions | 48.3 × 22.2 × 17.8 cm (W × H × D) |
| Weight | 27lbs |
| Power | 105/125VAC, 50/60Hz 125W |
| Frequency Response | 3Hz-30kHz ±1dB |
| Output Power (30Hz-20kHz, 2% THD) | 40W |
| Amplifier Topology | Class AB |
| Gain | 64dB |
| Input Sensitivity | 0.9V |
| Input Impedance | 100kΩ (125/150Ω, 500/600Ω with 15095 or 4665 plug-in transformer) |
| Source Impedance | 150Ω, 600Ω (With 15095 plug-in transformer) |
| Damping Factor | 5.88 |
| Load Impedance | 4Ω, 8Ω, 16Ω, 125Ω (70V) ungrounded |
| SNR | 85dB |
| Output Tube | 6CA7 (EL34) |
| Tube Complement | 6CG7 (x2), 6CA7 (EL34) (x2), 5AR4 |
| Finish | Dark Green |
| Channels | 1 Channel |
| Notes | 128A updated with "Thermeguard" transformer thermal protection.
Accessory: 15095 Transformer |
