Category:Mid High Fidelity (most Japanese recorders fall into this category)
Country of Manufacture:USA
Release dates:1964 - 1967
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:(all ±3 dB): 7½ ips: 40Hz - 18kHz
Wow and Flutter:less than 0.25% at 7½ ips and 0.4% at 3¾ ips
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The RK-140 was a medium-priced quarter-track stereo tape deck of hybrid design (four tubes and four transistors plus a full-wave rectifier).
Features included automatic cut-off at end of tape or when tape breaks. separate record/playback heads. Mu-metal shielding to eliminate hum. sound-on-sound. twin level meters. individual volume controls for each channel plus a master volume control. quiet, 4-pole air-cooled induction motor. belt drive with flutter-filtering and twin record buttons with safety interlocks.
The RK-140 was available in an attractive carrying case (illustrated) or walnut case for in-home installation.
Also available as a fully-equipped recorder with amplifiers & speakers (RK-155).
Stereo separation: 45dB or better / Bias & erase frequency: 80kHz / Fast wind time: less than 4 minutes for 7″ reel (1200ft) / Inputs: microphone, phono / Output: line, microphone / Audio output: 0..8 volts per channel / Transistor / tube complement: four tubes and four transistors plus a full-wave rectifier / Dimensions: 15 x 6.2 x10.5 inches (381 x 156 x 267mm) / Weight: 20 lbs less case(9.1 kg) / quarter-track stereo