DENON DR-350
¥ 79,800 (released in 1977)
Commentary
This is a cassette deck with an emphasis on the tape running system and proper recording function, as well as usability and tape protection.
It adopts a holding mechanism to improve the positioning accuracy of the cassette, and improves the floating and rattling of the cassette which tends to occur in the cassette deck.
The DR 350 has a height adjusting pin and a cassette holding spring at the upper and lower positions of the tape guide roller of the cassette half. Since the distance between the height adjusting pin and the position of the tape guide roller is wider than before, the perpendicularity between the tape running direction and the capstan shaft can be obtained correctly. This realizes stable tape running and ideal head touch. Wow flutter, level fluctuation, and phase distortion between channels are reduced.
Equipped with a self-aligning hub drive mechanism.
In the case of a cassette deck, the sound becomes muddy due to eccentricity of the reel hub and joint vibration that occurs several times per reel rotation. By adopting the automatic aligning hub drive mechanism, the reel hub of the cassette tape is closely attached to the mechanism stand, and eccentricity of the reel hub is reduced.
In addition, since there is no looseness between the reel base and reel hub, the tape can be wound neatly even when fast forwarding or rewinding.
Using a 3-stage equalizer and a continuously variable bias adjustment method, the linearity and frequency characteristics of each tape can be optimized.
It uses an upright tilting mechanism and a mechanism that tilts the cassette tape. The automatic effect of the mechanism stabilizes the movement of each part. In addition, it uses an acrylic cassette window that makes the entire cassette tape easy to see and improves performance and operability.
Operation errors are minimized by considering the arrangement of operation buttons.
The one touch eject mechanism is adopted, and the cassette can be taken out with one touch from any mode without going through the stop.
Equipped with a Dolby NR system as a noise reduction system.
Equipped with a timer standby mechanism, timer recording and alarm clock playback are possible by combining timers.
Equipped with peak indicator.
Model Rating
| Type | 4-track, 2-channel stereo cassette deck |
| Motor used | One electronically controlled DC motor with built-in generator |
| Tape Speed | 4.8cm/s |
| Fast-forward time | Approximately 95 Seconds (C-60 Tape) |
| Rewind time | Approximately 75 Seconds (C-60 Tape) |
| Size of the tape used | C-60, C-90 and C-120 cassette tapes |
| Type of tape used | Chrome, Low Noise High Output, Low Noise, Ferri Chrome, Normal |
| Recording bias | Approximately 80 kHz The bias amount can be adjusted by about + 5% to -65% relative to the position of the chrome tape. |
| Wow and flutter | 0.058% wrms or less |
| Heads | Recording and Reproducing Heads : High Hardness Permalloy Erase heads : double-gap high density ferrite |
| Stereo channel separation | 30 dB or More (1 kHz) |
| Crosstalk (between adjacent tracks) | 58 dB or More (1 kHz) |
| Overall SN ratio (3% total harmonic distortion factor) | Dolby NR on : 64 dB or higher (CCIR W. rms, Chrome Tape, 1 kHz, THD3%) |
| Total third harmonic distortion | 1.1% or Less (LH Tape, 1 kHz, Standard Recording Level (140pwb/mm)) |
| Overall frequency characteristic | 30 Hz ~ 15.5 kHz (Chrome Tape) 30 Hz ~ 14.5 kHz (LH Tape) |
| Input Sensitivity / Impedance | Mic : -68dB/50k Ω Line : -21dB/50k Ω * 0 db = 0.775 vrms |
| Output Level / Impedance | Line : 0 dB (at 0.775 Vrms and 10k Ω load) / 600 Ω (at maximum output VR) Applicable load impedance 5k Ω or more Headphone : 0.7mW/8 Ω |
| Other Terminal | Ground terminal |
| Semiconductor used | Transistor : 26 IC : 3 SCR : 1 Diode : 15 pcs LED : 2 pcs |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 12W |
| External dimensions | Width 434x Height 162x Depth 292 mm |
| Weight | Approx. 8 kg |
| Attachment | Head Cleaning Set PIN code |