The APT Holman APT-1 is a vintage stereo power amplifier designed by Tom Holman in the late 1970s–early 1980s known for its high performance and conservative design.
Key Specifications
Power Output: 100 watts per channel into 8 Ω (stereo), 175 W into 2 Ω, 75 W into 16 Ω; in mono bridged mode, 200 W into 4 Ω or 8 Ω.
Frequency Response: 1 Hz to 30 kHz (some sources list 10 Hz to 30 kHz with ±0.25 dB tolerance)
Total Harmonic Distortion (THD): ≤ 0.03% into 4 Ω or 8 Ω; ≤ 0.05% into 2 Ω
Damping Factor: ~200 (into 8 Ω)
Input Sensitivity: 0.925 V (1 W output) or 90 mV (1 W output) depending on source
Signal-to-Noise Ratio: 80 dB below rated output
Speaker Load Impedance: 4 Ω to 16 Ω
Dynamic Headroom: 3 dB at 8 Ω, 2 dB at 2 Ω
Reactive Load Rating: 3 dB
Capacitive Load Rating: Up to 0.8 µF
SMPTE IMD: < 0.01%
Slew Rate: > 10 V/µs
Dimensions: 87 mm (H) × 429 mm (W) × 265 mm (D)
Weight: 10 kg (22 lbs)
Perfect Working Condition.