Complete Rotel set. Vintage of the eighties. Excellent state.  

Power amp: RB 850 (Stereo Power Amplifier with bridging option):
SpecificationsPower output: 50 watts per channel into 8 (stereo), 150W into 8 (mono)
Frequency response: 15Hz to 100kHz
Total harmonic distortion: 0.03%
Damping factor: 280
Input sensitivity: 1V
Signal to noise ratio: 116dB
Speaker load impedance: 4 to 16
Dimensions: 444 x 86 x 336mm
Weight: 9kg
Rotel RB-850 hifi power amplifierThe Rotel RB-850 power amplifier appeared in the 1980s and offered excellent value for money at just £130 A dual mono 50W/channel, on test it was shown to produce over 67W into 8 ohm speakers, 97W into 4 ohm and nearly 130W into 2 ohm speakers.
These amplifiers offer bridging by simply flipping a switch on the back panel. Bridged operation combines the "left" and "right" amplifiers into a single amplifier. One is fed with an inverted signal. You connect your speakers between the two red outlets from the amp, ignoring the black outlets and have double the voltage output. It is hard on the amplifier as effectively each amp is seeing only half the load impedence of the speaker being driven, so it is called upon to produce more current for the same voltage. For this reason, it requires a robust amplifier design.

Pre amp: RC 850 (Stereo pre amplifier with MM/MC phono stage):
SpecificationsFrequency response: 4Hz to 100kHz
Total harmonic distortion: 0.004%
Input sensitivity: 0.26mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 64dB (MC), 78dB (MM), 95dB (line)
Output: 1V (Pre out)
Dimensions: 444 x 66 x 283mm
Weight: 4kg

CD player: (Rotel RCD-865 Compact Disc Player):
Disc format: CD
Digital converter: SAA7321GP
CD Mechanism: CDM-4/19
Frequency response: 20Hz to 20kHz
Dynamic range: 96dB
Signal to Noise Ratio: 100dB
Channel separation: 100dB
Total harmonic distortion: 0.0025%
Line output: 2V
Digital outputs: coaxial
Dimensions: 444 x 86 x 346mm
Weight: 7kg
Accessories: RRT-7 remote control
Year: 1993