Brand: National (Panasonic)
Country of Manufacture:Japan
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 4
Head Composition: Permalloy
Head Configuration: Stereo
Frequency Response:( 3dB): 7½ ips: 30Hz - 20kHz 3¾ ips: 30Hz - 14kHz 1 ips: 30Hz - 9kHz
Wow and Flutter:7½ ips: 0.09%. 3¾ ips: 0.18%. 1: ips 0.22%
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The RS-790US was a quarter-track stereo bi-directional dual-capstan tape recorder with built-in amplifiers and speakers.
Three speeds were offered and the maximum reel size was 7″.
Other features included a four-digit tape indicator, sound-on-sound recording, all transistor design, inbuilt 10 watts (music power) per channel solid state amplifiers, two 7 x 5″ internal speakers and twin VU meters.
In his 1969 test report (see (t) above), A. Tutchings admits that he was not very impressed with the overall record-play responses.
The recorder sold (new) in the UK for £183 15s and £235 4s with external speakers.
Bias frequency: 50kHz / Inputs: microphone 67dB 20K, auxiliary -20dB 100K / Outputs: speaker 8 ohms, line 10k, headphones 8 ohms 15mW / Internal speakers: two 7 x 5″ / Rewind time: 5 minutes for 1800ft / Output power: 10 watts music power per channel / Dimensions: 17 x 16½ x 8½ inches (432 x 419 x 216mm) / quarter-track stereo (with auto-reverse record & playback)