Category:Mid High Fidelity (most Japanese recorders fall into this category)
Country of Manufacture:USA
Release dates:1967 - 1970
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stereo
Frequency Response:(all ± 3 dB): 7½ ips: 40Hz -18kHz
Wow and Flutter:(less than) 0.15% at 7½ , 0.25% at 3¾ips
Signal-to-Noise Ratio:better than 50dB
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The RK-820 was a quarter-track, three-speed solid state stereo tape deck with a 7″ reel capacity.
Features included three separate heads, separate record & playback preamplifiers enabling off-tape monitoring when recording, sound-on-sound, sound-with-sound, auto shut-off at end of tape and twin VU meters.
Price when new was $159.95
Crosstalk: better than 60dB / Bias frequency: 96kHz / Inputs: microphone:9mV 10kohms, auxiliary:300mV 500Kohms / Outputs: external amp: .9V at 3kOhms / Dimensions: 12¾ × 10¾ × 6″ (323 × 272 × 153mm) / Weight: 22 lbs (10 kg) / quarter-track stereo