The Roberts 770X uses a cross-field bias technique for recording, which results in extended high frequency performance.
Two separate amplifier units result in easy identification of channel controls.
Built in monitor speakers with on/off switch.
The recording light is driven from the erase circuits.
Very positive lock-out to prevent accidental recording.
Sound on sound facility; dubbing from left to right.
Pause button which may be locked in either run or pause mode.
Tape tension idler with built in cleaning pad.
End of tape can be set to either automatically stop the mechanism or turn off the entire machine.