Audio Database

RS-B605
Commentary

A cassette deck equipped with Dolby HX-PRO and 3 nr.

Equipped with the Dolby HX-PRO, which detects the high frequency component of the input signal every moment during recording and automatically reduces the bias current according to the set value following the change of the high frequency component.
As a result, the over-bias is not generated for the high-frequency band, and the bias amount becomes more ideal for the low-frequency band. Thus, the high-frequency band characteristics are greatly improved without deteriorating the low-frequency characteristics.

The NR system is a 3 nr design with Dolby B and C in addition to dbx, and can be used in various ways depending on the application.
In addition, the combination of dbxNR and Dolby HX-PRO system has the effect of doubling the improvement in the high-frequency characteristics of HX-PRO, and the dynamic range close to that of CDs can be obtained in almost all bands.

A classAA unique to Technics is used for the recording equalizer amplifier.
In this circuit, the voltage control and current drive are shared by dedicated amplifiers respectively, and the output waveform is determined by the voltage control amplifier which is not affected by the load, so excellent waveform response is achieved.

We have developed and adopted a single-chip custom IC dedicated to the deck for the regenerative equalizer amplifier.
By adopting a bias cancellation method that reduces the input bias current to approximately 1/100 of the conventional method, it is possible to prevent the click and the transient shift of the operating point that occur at the time of input switching, and by reducing the coupling capacitor, sound quality is also improved.

Uses a quiet design 2-motor full logic mechanism.

Uses a high hardness permalloy head.

Equipped with a music selector that can quickly find the beginning of the current or next song.

Equipped with Auto Rec Mute.

Equipped with a wide range 3-color FL peak level meter.

With LED indicator, auto tape selector.

Timer Rec & Play function which is convenient for answering machine.

L/R independent microphone input.

Electronic counter.

Model Rating
Type Stereo cassette deck
Heads Recording and Playback : High Hardness Permalloy
Erasing : double-gap ferrite
Wow flutter 0.06% (W. R. M.S.) ± 0.12% (W. Peak, EIAJ)
Frequency characteristic Normal (ED) : 20 Hz to 17 kHz, 30 Hz to 16 kHz ± 3 dB (EIAJ)
CrO2(EX) : 20 Hz to 18 kHz, 30 Hz to 17 kHz ± 3 dB (EIAJ)
Metal (EM) : 20 Hz to 19 kHz, 30 Hz to 18 kHz ± 3 dB (EIAJ)
Signal-to-noise ratio NR off : 56 dB (EX Tape, WTD, 1 kHz, 3% third order distortion)
Dolby B NR IN : 66 dB (EX Tape, CCIR)
Dolby C NR IN : 74 dB (EX Tape, CCIR)
Dbx IN : 92 dB (EX Tape, WTD, 1 kHz, 3% third order distortion)
Input terminal Line : 60 mv (Input IMP47k Ω)
Microphone : 0.25 mv (Compatible IMP400 Ω ~ 10k Ω)
Output terminal Line : 400 mV (output IMP3k Ω)
Headphone : 80mV/8 Ω (Compatible IMP8 Ω ~ 600 Ω)
Pwer 100 VAC, 50Hz/60Hz
Power consumption 17W
External dimensions Width 430x Height 114.5x Depth 287 mm
Weight 4.3kg