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Yamaha B-2

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Technic details

Specifications

Type:
Stereo Power Amplifier
[Amplifier section]
Dynamic power:
140W + 140W (8Ω, 1kHz, THD 0.1%)
Effective output:
100W + 100W (8Ω, 20Hz to 20kHz, THD 0.08%)
140W + 140W (4Ω, 20Hz to 20kHz, THD 0.08%)
Total harmonic distortion (20Hz to 20kHz, 8Ω):
0.08% or less (At effective output)
0.01% or less (At 50W output)
0.008% or less (At 10W output)
Intermodulation distortion factor (70Hz: 7kHz = 4: 1):
0.03% or less (At 8Ω, 50W output)
0.03% or less (4Ω)
0.03% or less (16Ω)
Frequency characteristic (At 8Ω, 1W output):
DC to 100kHz, +0 -1dB (DC)
10Hz to 100kHz, +0 -1dB (Normal)
Phase characteristic:
Within +0° and -30° (DC to 100kHz at 10W output)
Power bandwidth:
5Hz to 100kHz, -3dB (8Ω, THD 0.5%)
Damping factor:
70 (8Ω, 20Hz)
70 (8Ω, 1 kHz)
50 (8Ω, 20 kHz)
Input impedance:
25kΩ
Input sensitivity:
775mV
S / N ratio (IHF-A network):
115dB (input 4.7kΩ short)
Residual noise:
0.25mV
Input terminals:
1 and 2 (front selector switch)
Normal, DC (rear switch)
Output terminal:
A, B (Front selector switch)
[Peak meter section]
Display range:
-50 to +5dB (0dB = 8Ω / 100W and 0dB = 0 dBm)
Indication error:
-20 to +5dB - ±1dB
-20 to -40 dB - ±2dB
-40 to -50 dB - ±3dB
Frequency response:
20Hz to 20kHz, ±1dB
Response speed:
100μs
Recovery speed:
1 sec.
Instruction switching:
Internal-External
Sensitivity switching:
0dB = 8Ω / 100W / 100kΩ / -0dBm / 43kΩ
Semiconductor used:
Vertical FET's - 8 pieces
Horizontal FET's - 4 pieces
Transistor - 95 pieces
IC's - 2 pieces
Diodes - 66 pieces
Power supply:
AC 100V, 50 / 60Hz
Rated power consumption:
290W
Dimensions (W x H x D):
436 x 151 x 370mm
Weight:
26kg
Year:
Around 1976

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