Country of Manufacture:United Kingdom
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 4
Head Composition: Permalloy
Head Configuration: Stereo - Stacked
# Motors: 3
Frequency Response:(all 3 dB): 7½ ips: 40Hz - 15kHz
Wow and Flutter:0.1% at 7½ ips, 0.2% at 3¾ ips
Signal-to-Noise Ratio:better than -45dB
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The R7 was a half-track, bi-directional mono recorder with two speeds – 7½ and 3¾ ips. Twin tape head assemblies and a two-speed reversible capacitor-run motor enabled the R7 to record and playback in both directions. Two reel motors were fitted for a fast forward/rewind speed of 1200ft per minute.
Functional control was via a simple two-knob arrangement and other features included auto stop, pause, digital counter, direction indicators, magic eye modulation level indicator, separate bass and treble controls and a 10 watt push/pull amplifier.
Speed variation: less than 1% at both speeds / Valve complement: 3 x EL84. 2 x EF86. ECL82. ECC83. EM84. EN91 and EZ81 / Rewind speed: 1,200ft per minute / Audio output power: 10 watts into 15 ohms / Inputs: 2 x 4mV at 2.2M. 1 x 40mV at 0.5 M and 1 x 250mV at 0.5M / Outputs: line – low impedance. external speaker: 15 / 16 ohms / Speaker(s): 8 x 6″ elliptical and 4″ round – both Rola-Celestion high-flux density / Dimensions: 16½ x 16 x 10¼” (419 x 406.5 x 260.5 mm) / Weight: 45 lbs (20.5 kg) / half-track mono