SONY NR-500
¥ 29,800 (released in 1981)
Commentary
Dolby NR / C type processor that reduces hissing by 20 db (5 khz).
The noise reduction of the Dolby NR / C type is 3 dB at 100 Hz, 18 dB at 1 kHz, and 20 dB at 5 kHz, so it can be reduced to a region where hissing is hardly felt.
It uses a sliding band method that effectively reduces noise by suppressing breathing.
Equipped with an anti saturation circuit to improve the high saturation level of the tape.
Supports a wide range of 2-head and 3-head decks.
Recording simultaneous monitor is not available.
Equipped with a level check indicator.
An all-front control type playback CAL volume is mounted independently on L/R.
A cassette tape for the reference level is included for easy adjustment of the playback level.
Model Rating
| Type | Dolby NR / C Type Processor |
| Circuit configuration | Dolby NR / C Type Stereo recording or playback |
| SN ratio improvement | 100Hz:3dB 1kHz:18dB 5kHz:20dB |
| Improved level of tape saturation | 4 dB (9 kHz or more) |
| Frequency characteristic | 20 Hz to 20 kHz ± 3 dB |
| Input Level / Impedance | Line-in (encoder input) : Standard -10dB/50k Ω Decoder Input : Standard -5dB/50k Ω |
| Output Level / Impedance | Lineout (decoder output) : -5dB/10k Ω Encoder output : -10dB/10k Ω |
| Power consumption | 7W |
| External dimensions | Width 430x Height 55x Depth 285 mm |
| Weight | 3.2kg |
| Attachment | Stereo connection code 2 pcs Reference Level Tape (Cassette) 1 Volume |