Stereo Cassette Tape Deck
DR-330 Quartz Lock PLL capstan drive Tension Servo Sensor
DENON's exclusive servo tension technology is available in no other cassette deck. The PLL quartz locked DC servo capstan drive motor ensures maximum tape transport stability.
The high quality F-alloy record and playback heads, the power regulated non-slip drive, and the complete use of DC amplifier construction, all represent the very highest technology in cassette reproduction.
The fine adjust bias and Dolby Noise Reduction systems let you optimize the deck's performance for any cassette tape.
Much of this technology was originated by and remains exclusive to DENON.
Thirty years of experience in the production of magnetic tape machines and a 70-year history of uncompromising quality are all reflected in the design and construction of the DENON three-head DR-320 and threehead quartz locked DR-330. Since the introduction of our first professional tape deck in 1950, our goal has always been the same—the highest degree of accuracy in recorded sound.
DR-330/DR-320
servo tensioner three-head cassette decks
DR-320 Tension Servo Sensor
DENON's exclusive servo tension mechanism, three-heads with tape monitoring, and a host of convenient, easy-to-use functions have all been combined in this maximum value cassette deck. The outstanding sound quality of the DR-320 is reflected by its excellent frequency response (25 Hz—21 kHz with metal tape) and wide dynamic range. Other important features of the DR-320 include its tension servo sensor, non-slip reel drive, and F-alloy recording and playback heads, full DC amplifier application, Dolby Noise Reduction, and dual power supply, and more exceed your expectations in an easy-to-use cassette deck.
DENON has always pursued excellence in the development of highfidelity cassette decks. This series is the culmination of our continued research into tape transport, amplifier, and three-head cassette deck technology.
Through our efforts, we've made a definite improve
The first step in the improvement of sound quality lies in the tape transport mechanism
When the elect button is pushed the mechanism is stopped automatically, and then the cassette door opens smoothly and silently
A cassette tape transport mechanism is not only composed of the machine itself, but also the tape cassette. The quality of the tape hub, quide rollers. and shell half, as well as the way they work together play a direct part in tape transport. These factors become more critical in three-head machines when providing for precise tape head contact for both
heads when only one contact pad exists in the conventional cassette tape. Simply by making a combination record/playback head alone doesn't solve the problem because optimal tape-to-head contact with both the recording and playback heads is understandably difficult due to the necessity of even a small gap between the heads
So the critical point in the performance of threehead cassette decks is actually adequate head contact as well as smooth tape speed. Because of this the basic functions of a transport system in a three-head deck isn't just a matter of controlling wow and flutter, or other variations in tape speed. but also the transport system should work to eliminate dropouts and hiss, as well as to improve channel senaration which are maladies caused by less than perfect tape head contact. All these factors together determine the overall capabilities in a quality cassette deck. Being able to record with a wide frequency range canability isn't simply a matter of having three heads, but involves proper tape head contact. Therefore, precise tape tension is an extremely crucial factor in obtaining high performance from a three-head deck
Between the pressure post near the erase head and the capstan, an isolated loop effect is formed cancelling the influence of the cassette shell and mechanism in the tape transport process. As a result, the tape tension never varies insuring constant and consistent tape-to-head contact.
| Sensor OFF | Sensor ON | |
|---|---|---|
| The ground of station and state | e er | |
| ‡/a | € / að | |
| 1.1 | Set and the particular of the second | |
ment in the three-head cassette deck.
Smooth, even tape transport capability is now possible due to DENON's introduction of a tape tension servo sensor in this series. The principle involves setting up a sensor that measures the tape tension between the erase head and the recording and playback heads. The sensor arm serves to delicately measure the running tape tension and control variations by altering the pressing force between the erase head and the pressure post. The high precision of this system is due to a short servo loop and a highly accurate gauging mechanism. Tape tension is precisely regulated, assuring excellent tape head contact which serves to eliminate dropouts and hiss. The result is vastly improved sound reproduction quality.
Two motor high-compliance double plunger mechanism for an improvement in stability and accuracy.
The capstan drive and reel drive functions are performed by two separate motors. Each mechanism is directly controlled by an IC logic circuit connected to feather-touch function controls on the front panel. The capstan drive motor is a special DC servo motor utilizing a high precision flywheel resulting in wow and flutter specifications of less than 0.04 wrms. Stability and accuracy are improved and fluctuations in line voltage are easily compensated for. In the DR-330 model, the capstan drive motor is quartz-locked PLL servo controlled, and the reel drive motor features high precision coreless design To achieve painstakingly precise constant tape speed, the capstan motor is controlled by a PLL circuit for precise speed control, regardless of variations in temperature. And, the separate coreless reel drive motor ensures stable tane transport
DENON's improved non-slip reel drive system. Depending on the amount of tape in the take-up
reel, the speed of the hub will change, therefore varving take-up torque. Normally, a slip type mechanism is used to control the proper speed of the take-up reel as well as the tension of the tane. Felt or metal is often used for these conventional slipclutch mechanisms, but an inherent drawback is that the friction of these materials is affected by variations of temperature and humidity, resulting in a variation of take-up torque. This then causes changes in tape tension which adversely affects tape head contact. And with this comes dropouts. poor separation, and wow and flutter. Furthermore a variation in tane tension also results in the tane being wound too tightly too loosely or in upeyer, off center variations within the reel. But is this series. the reel drive speed and torque electronically by a special non-slip drive mechanism
During the fast forward and rewind modes, the voltage fed to the motor is changed. As the load to the motor is increased, the motor turns slower and the torque increases, but as the load is decreased, the speed increases while the torque decreases. Therefore, as this type of motor is used, temperature, and humidity.
perature and numidity fluctuations have no bearing on take-up reel torque, rendering conventional slip-type mechanisms obsolete. And, unlike slip-type systems that eventually deteriorate with use, DENON's non-slip reel drive always delivers perfect torque, regardless of age or environmental variables.
Higher quality is achieved with a three-head configuration
F-alloy combination head provides even frequency response from 20 Hz to 22 kHz. The recording head is set with a wide gap to allow the greatest
possible capability variations for the MOL chara teristics of every type of tape, including metal. The playback head is set with a narrow gap, 1/5 that of the recording head, for a supremely flat frequency response.
| alblank American |
ta batta
G. anton DM national d |
Per tilar | . d |
|---|---|---|---|
| - Julia | L | Lill. | |
| - | 10.00 | ||
| 1.1.1 | |||
| 0.00 | 3111 | ||
| 1 | |||
| 18 | 100 | 111 | |
| a antici | |||
| A2196 | 1000 | 111 | |
| - | 344 | ||
| 1.451 1.841-21 |
Furthermore, the F-alloy head has excellent magnetic flux density, permeability, and hardness properties
assuring superior fidelity in both recording and playback. In order to cancel the crossfeed between the recording and playback heads, special care has been taken in the choice of core material, as well as in the way the coils were wound. Also, a special masking shield has been inserted between the two heads, reducing crossfeed to an amazing -78 dB. Remarkable frequency response (25 Hz-21 kHz using metal tape in the DR-330) is realized giving full play to the capabilities of each head. Superb fidelity is assured with these high performance
heads by eliminating capacitors in favor of direct coupling configurations to the DC amplifiers for each respective head. Of course, by a microscopically precise assembly technique, severe tolerances for azimuth control are checked as both heads are bonded.
Special erase head has surplus power to erase highly magnetic metal tape.
A strong erase head is necessary to completely erase metal tapes, which have a magnetic capacity of more than double that of normal tape. For this purpose, we've adopted an E-shaped double gap
core in the erase head. The ferrite core has a naturally strong magnetic field which increases dramatically the erase capability.
Program quality can be fine tuned through the electronic tape adjustment system
Wide dynamic range and frequency response is possible through DC amplifier luxury.
To take full advantage of tape head quality, two separate DC amplifier circuits are used, one for recording and one for playback. Clean, crisp, improved sound characteristics are the result as frequency response and dynamic range capabilities are increased. First, the capacitors between the heads and the amplifiers have been done away with. In place of this signal transmission system. carefully chosen DC amplifiers have been used throughout this series. The microphone recording equalizer, playback, headphone, and meter amplifiers are all the finest quality DC amplifiers. featuring circuit design that eliminates inherent noise through push-pull circuitry which actually improves dynamic range while at the same time eliminates frequency clipping. In the bias oscillator circuit, a push-pull circuit design is also employed b reduce distortion while improving recording signal quality.
In a three-head deck, the benefits of double Dolby are apparent.
Wide coverage VU meters with three point peak level indicators.
The VU meters indicate a wide range, from – 20 dB to +6 dB in accordance with the scale necessary to handle metal tape. The three peak level indicators strictly monitor the signal throughout the entire dynamic range. The indicators are in three colors; green for 0 dB, vellow for +5 dB, and red for +8 dB.
Four position selector for bias and equalization adjustment.
The tape select switch allows you to adjust for the characteristics of any type of tape. Normal, FeCr. CrO2, and
metal tape positioning is possible to adjust for the bias and equalization properties of each type of tape. Even when engaging the Dolby circuit, the sensitivity can be properly set.
The DR-330 features a bias fine tune adjustment.
One the DR-330, in addition to the four position tape selector, a bias fine adjust-
DR-330/DR-320
ment control is also featured. In each position of the tape selector, the fine adjustment works to vary the bias ±30% of the assigned setting. When used with the playback monitor, the bias can be fine tuned manually to perfection.
The headphone volume is regulated by the output level.
Superior functioning and design puts program control at your fingertips
Auto cue and review functions let you play prerecorded material right from the beginning, automatically!
The Auto Cue Review system automatically finds gaps (greater than four seconds) between songs and then plays the song right from the beginning. It oper-
ates by the playback head finding the blank portion of the tape without coming into direct contact with the tape itself. This eliminates unnecessary wear or damage to both the head and the tape. This feature operates out of any mode, fast forward, rewind, record, or stop, allowing quick recall and playback of prerecorded material.
Optional feather touch remote control unit
From the palm of your hand, all functions of the tape deck can be smoothly controlled by plugging the control cord plug into the special jack on the front panel of the deck. REC, PLAY, FF, REW, STOP, CUE/REVIEW, and PAUSE/MUTE functions can all be controlled from up to three meters (twelve feet) away.
One touch recording pause
If there is a likely chance you'll be recording momentarily, one touch of the record button instantly creates a recording standby condition. With both the record and pause indicators lit, the recording levels, bias, and sensitivity can all be set quickly and efficiently. Just a touch of the play button starts
the recording.
Pause/mute function
The pause and mute button have been combined into one function for greater convenience. When recording, a push of the pause/mute button stops the tape
and cuts the recording signal to the record head. When the pause/mute is depressed without lettin, up, the tape still runs, but no signal is being recorded. By letting up, the pause function takes effect. Then, to begin recording again, a touch of the play button is all it takes. What a handy function for editing! By combining these two functions, unwanted noise during pauses is eliminated, especially during air checks. You can also use this function to make four second blank intervals necessary for the activation of the cue/review system. When the mute function is being used, the pause/mute LED lamp flashes once per second, allowing for the easy timing of the intervals between recorded material.
Single touch ejection system.
With just a single touch of the eject button, the tape is stopped in any mode, and the cassette door opens softly and silently.
Recording and playback timer start function.
Activation of either button will allow the deck to record or pla according to a timer signal. Until one tape is finished, the operation can be started and stopped any
number of times.
SPECIFICATIONS
Type: Heads
Motors:
Wow and flutter: Fast forward/Rewind time Overall S/N ratio:
Overall frequency response METAL tape: CrO2 tape: L.H. tape: Crosstalk: Input Microphone: Line: Output
Headphone
Power supply
Power consumption: Dimensions (W ×H ×D), weight:
DR-320
4-track, 2-channel, stereo 4-track, 2-channel, stereo Record/playback: F-alloy Erase: Double gap Ferrite Capstan: Quartz locked PLL DC capsta
eel: DC motor ess than 0.04% wrms pprox. 85 sec (C-60) ore than 67 dB (DOLBY NR witch at ON)
25 Hz-21 kHz ±3 dB 30 Hz-20 kHz ±3 dB 30 Hz-19 kHz ±3 dB -65 dB (1 kHz)
DR-330
35 mV/10 k Ω, ) mV/50 k Ω,
775 mV (load impedance: 10 k Ω) 1.2 mW (load impedance: 8 Ω - 2 k Ω) AC 120V/60 Hz or 200/220/240V 50/60 Hz 25W 434 × 117 × 300 (mm), 7.0 kg
4-track, 2-channel, stereo Record/playback: F-alloy Erase: Double gap Ferrite Capstan: DC servo motor
Reel: DC motor Less than 0.04% wrms Approx. 85 sec (C-60) More than 67 dB (DOLBY NR switch at ON)
25 Hz—21 kHz ±3 dB 30 Hz—20 kHz ±3 dB 30 Hz—19 kHz ±3 dB -65 dB (1 kHz)
0.35 mV/10 k Ω, 70 mV/50 k Ω,
775 mV (load impedance: 10 k Ω) 1.2 mW (load impedance: 8 Ω – 2 k Ω) AC 120V/60 Hz or 200/220/240V 50/60 Hz 25W 434 ×117 ×300 (mm), 7.0 kg
Remote Control Unit RC-55
Light and slim, this unit can be used easily and comfortably in either hand. Rationally designed around the human hand, it enables you to control all functions for enjoyable tape operation.
DENON CASSETTE TAPES
NO. 14-14, AKASAKA, 4-CHOME MINATO-KU, TOKYO, 107, JAPAN
Brilliant quality. A full metal-tonormal tape lineup.
NIPPON COLUMBIA CO., LTD.
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