Power Amplifier RB-981

A 2 x 130 watt Hi-Fi stereo power amplifier. On the front, a press button for Power and indicators for Power on, Protection and Bridged Mono. On the back, Left and Right input RCA sockets for connection to a preamplifier. In order to use the RB-981 in bridged mode, three “jumper” connectors inside the amplifier must be moved from one set of pins to another. In bridged mode the Left and Right channels are bridged into a into a single mono amplifier and the cable from the preamplifier output is connected to the Left input RCA socket. Four terminals to connect one stereo pair of loudspeakers, or to one loudspeaker in bridged mode where the wires to the loudspeaker are connected to the positive terminals of the left and right channels.

Continuous Power Output :
130 watts per channel, min. RMS both channels driven into 8Ω
from 20Hz to 20kHz with < 0.03% Total Harmonic Distortion
170 watts per channel, min. RMS both channels driven into 4Ω
from 20Hz to 20kHz with < 0.05% Total Harmonic Distortion
Bridged Mono Power Output :
360 watts mono, min. RMS driven into 8Ω
from 20Hz to 20kHz with < 0.1% Total Harmonic Distortion
Total Harmonic Distortion ......:  < 0.03%
Intermodulation Distortion .... :  < 0.03% (60Hz : 7kHz, 4:1)
Damping Factor ................... :  500 (20Hz - 20kHz, 8Ω)
Speaker load impedance  .....:  4Ω minimum Stereo, 8Ω minimum Bridged mode
Input Sensitivity/Impedance ..:  1.0V/33kΩ
Frequency Response ...........:  4Hz - 100kHz, +0.5dB, -3dB
Signal to Noise Ratio ............:  120dB (IHF, A Network)
Power Consumption .............:  400 watts

Versions/Power Requirements
115 V AC 60Hz
230 V AC 50Hz

Here you find 340 models, 329 with images and 32 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Roland Electronics Co. Ltd., Rotel; Tokyo