Country of Manufacture:USA
Speeds: 3 3/4, 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 3
Frequency Response:7½ ips: 60Hz - 15kHz
Wow and Flutter:less than 0.06% at 7½ ips, less than 0.1% at 3¾ ips
Signal-to-Noise Ratio:50dB at 7½ ips, 45dB at 3¾ ips
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The Roberts 400 was in fact little more than an Akai 345 with a Roberts badge.
Features included three heads, three motors, automatic reversing, four-track stereo/mono, built-in 20 watt stereo solid state power amplifiers, auto shut-off, remote control, all push-button system and 10½” reel
capability (with special outrigger-style adapters.
Three speeds were available. 7½, 3¾ and 15 ips (only possible with accessory capstan and pinch wheel).
Two related models, the 400X and 455 were was also available, both identical
to the 400 (and Akai 345) but with the following variations: the 400X had the cross-field bias system while the 455 had no automatic forward or reverse play.
Channel separation: better than 80dB at 1kHz / Total harmonic distortion: within 3% at 1kHz / Equalisation: correct equalisation of tapes recorded to NARTB characteristic / Rewind speed: less than 60 seconds for 1200ft / Audio output power: 6 watts per channel / Speakers: two 6″ internal speakers / Valve complement: 12AD7 x 4. 12AT7 x 3. 12AU7 x 2. 12AX7. 6X4 / Dimensions: 17¼ x 16 x 12¼” (438 x 406 x 311mm) / Weight: 65 Ibs (29.5kg) / quarter-track stereo