Hi-Fi Stereo Amplifier 608, 1961 - 1964
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B&O High Fidelity Stereo Amplifier Technical Specifications
Rectifiers:
For Power amplifier: SSF B 300 C 200. For grid bias supply and preamplifier: SSF E 60 C 160
Power Consumption: 75 W
Preamplifier: Interchangeable printed circuit boards. 4-stage transistor preamplifier with low-noise input transistors, bass and treble controls, volume control.
Transistors: One AC 107 and three AC 126. Distortion:
Less than 0.5 % below 10 W, less than 2 % at 15 W per channel.
Frequency Response:
20-20,000 c/s -L 1 dB, falling off towards 100 Kc/s without resonance peaks.
Input and Sensitivity at 1000 c/s and 5 W output per channel:
1. Gramophone: B&O stereo pickup: sensitivity 2 mV, frequency response curve according to DIN standard 45547. By interchanging the adaptor, the gramophone input can be converted into input for crystal pickup: sensitivity 50 mV. Low-impedance pickup: sensitivity 0.5 mV
2. Tape Recorder: Sensitivity 100 mV,
linear frequency response curve.
3. Microphone 50-200 ohms: sensitivity
160 [1 V, linear frequency response curve.
4. Radio: Sensitivity 50 mV, linear frequency response curve.
Mains Voltage:
220 volts AC. Mains transformer can be switched for operation from 110-volt AC mains.
Cross talk between Channels: - 50 dB. Fuses:
For 220-volt operation: 630 mA rating, Type slow blow. For 110-volt operation: 1.0-ampere rating, Type slow blow.
Noise Level:
- 60 dB (total noise approx. 1000 times less than signal).
Tone Control:
Bass Control: + 12 dB - 12 dB at 50 c/s Treble Control: + 12 dB - 12 dB at 10 Kc/s.
Scratch Filter: - 3 dB at 5 Kc/s, - 12 dB at 7 Kc/s, - 22 dB at 10 Kc/s.
Rumble Filter: - 2 dB at 50 c/s, - 12 dB at 30 c/s, - 22 dB at 20 c/s.
Output Power:
2X15 watts. Output voltage: 4 ohms
7.75 volts, 16 ohms - 15.5 volts at full drive. No change in output voltage at load impedance higher than the one chosen.
Power Amplifier:
One ECC 83 (two amplifier stages, one for each channel), four ECL 85's (amplifier stages, phase inverters, and push-pull output stages). neg. feedback: 16 dB
Output Impedances: 4 ohms and 16 ohms
Dimensions: 465 mm wide, 180 mm high, 208 mm deep