Quad - II Tube mono block power amplifier - Multiple models

Pair of 2 valve amplifiers Quad II dating from 1958. They are functioning, refurbished and fully original in perfect condition with new tubes with only 10 hours of operation. They feature a purpose-built power supply constructed by a specialized technician.

Type: 2 valve power amplifiers
Output power (RMS): 15 W across the entire range from 20 Hz to 20 kHz
Frequency response: Within 0.2 dB from 20 Hz to 20 kHz
Within 0.5 dB from 10 Hz to 50 kHz
Distortion: (measured at 12 W output): Total of the third harmonic and higher at 700 Hz
Only higher-order harmonics: at 700 Hz
Total harmonic distortion (THD): at 50 Hz not exceeding 0.25%
Input sensitivity: 1.4 V rms for 15 W output
Load impedance: 1.5 MΩ in parallel with 10 pF
Noise floor: 80 dB below the reference of 15 W
Output impedances: 15Ω and 7Ω
Effective output resistance: 1.5 Ω for a 15 Ω output setting
Power supplies (input): 200-250 V AC single-phase at 40–80 Hz
Power consumption: 90 W excluding control unit and tuners, etc.
Weight: 8.3 kg each
Dimensions (L x W x H): 165 mm × 330 mm × 120 mm
Year of manufacture: 1958 / 1970
Made in: England

PERFECT FROM BOTH A TECHNICAL AND AESTHETIC POINTS OF VIEW.