QUAD 303
¥ 110,000 (1 unit, around 1986)
Commentary
Stereo power amplifier.
Symmetrical triple is used for the circuit, and the strain is reduced by the perfect temperature countermeasure.
By using symmetrical triples, the output current can be controlled simply and effectively. Moreover, the voltage can also be controlled. Therefore, the output transistor is protected without a protective circuit that would adversely affect sound quality and increase the cost.
Model Rating
Type | Stereo power amplifier |
Effective power | 45W + 45W (8 Ω) |
Total harmonic distortion factor (8 Ω load, sine wave input) | 0.03% or Less (at 100 Hz, 45W output) 0.03% or less (at 1 kHz, 45W output) 0.03% or less (at 10 kHz, 45W output) |
Output internal impedance | 2000 μ F, 6 μ H in series with 0.3 Ω |
Frequency response (1 kHz standard, 8 Ω load) | 30 Hz to 35 kHz -1dB |
Input sensitivity | 0.5 V (8 Ω Load, 45W Output) |
Input impedance | 22k Ω / 60 pF |
Maximum input limit | If the input signal is up to + 20 dB, it will be restored immediately. |
Crosstalk (at 1k Ω input load) | 60 dB or More (30 Hz to 10 kHz) |
Signal-to-noise ratio | -100dB (A correction) -95dB (uncorrected) |
Pwer | 100 ~ 130 VAC / 200 ~ 250 V, 50Hz/60Hz |
Power consumption | 40W ~ 200W (depending on input level) |
External dimensions | Width 120x Height 159x Depth 324 mm |
Weight | 8.2kg |