Quad - II Tube mono block power amplifier - Multiple models

Pair of 2 valve amplifiers Quad II from 1958. They are functioning, serviced and entirely original in perfect condition with new tubes having only about 10 hours of use. They feature a dedicated power supply built ad hoc by a skilled technician.

Type: 2 valve power amplifiers
Output power (RMS): 15 W across the full 20 Hz to 20 kHz range
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 third harmonic and higher at 700 Hz; Only high-order harmonics at 700 Hz
Total harmonic distortion (THD): not exceeding 0.25% at 50 Hz
Input sensitivity: 1.4 V rms for 15 W output
Load impedance: 1.5 MΩ in parallel with 10 pF
Background noise: 80 dB below the reference of 15 W
Output impedances: 15 Ω and 7 Ω
Effective output resistance: 1.5 Ω for the 15 Ω output setting
Power supplies (input): 200-250 V AC single-phase, 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 x 330 mm x 120 mm
Year of manufacture: 1958 / 1970
Made in England

PERFECT IN BOTH TECHNICAL AND AESTHETIC respects."