Three-Speed Reel to Reel Tape Recorder
The Roberts 770X uses a cross-field bias technique for recording, which results in extended high frequency performance.
Features include two separate amplifier units resulting 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, and a tape tension idler with built in cleaning pad.
In addition, the end of tape can be set to either automatically stop the mechanism or turn off the entire machine.
Track system: 4-track, 2-channel, stereo/monaural system
Heads: 1 x playback/record, 1 x erase, 1 x bias
Motor: 2 speed hysteresis synchronous
Tape speeds: 1 7⁄8 3 3⁄4 7 1⁄2 ips
Wow and flutter: 0.15% (7 1⁄2 ips)
Frequency response: 40Hz to 20kHz (7 1⁄2 ips)
Signal to Noise Ratio: 45dB
Total harmonic distortion: 3%
Output power: 6 watts
Speakers: 2 x 4"
Valve complement: 2 x EF86, 1 x 12AD7, 2 x 12AX7, 2 x 6X4, 1 x 6AR5
Dimensions: 20 x 14 x 9 inches
Note: optional 15 ips conversion kit
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