Category:Mid High Fidelity
Country of Manufacture:Japan
Release dates:1971 - 1975
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 2
Dimension: 14½ x 14½ x 9½ " (368 x 371 x 244mm)
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 1
Outputs: RCA, DIN
Frequency Response:( 3dB): 7½ ips: 40Hz to 15 kHz
Wow and Flutter:.18% at 7½ ips, 0.25% at 3¾ ips & 0.35% at 1ips
Signal-to-Noise Ratio:50 dB at 7½ ips
Sound quality rating:5 / 10
Long-term reliability rating: 7/ 10
Weight: 30 lbs (13.64 kg)
The 1720 was available in two versions, suffixed “W” and “L”. These suffixes referred to the type of case, wooden (W) or leather-finish over wood (L).
It was a quarter-track stereo recorder with a built-in solid state 6 watt power amplifier (3 watts per channel) and two 7 x 5″ speakers.
The 1720 could handle reels of up to 7″ and the built-in reel retainers meant that the recorder could be used in a vertical position. Three speeds were available. 7½ , 3¾ & 1 7/8 ips, selectable via the two-speed motor in conjunction with a removable capstan sleeve.
Semi-conductors: germanium transistors / Rewind speed: 2½ minutes for 1200ft / Audio output power: 3 watts RMS per channel / Inputs: mic: 3.5mV 20K. line: 30mV 150K. DIN: 10mV 50K / Outputs: stereo phones: 150mV 8 ohms. line: 1.2V (0 VU) 82K. DIN: 2.5V / Speaker(s): two 7 x 5″