What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Tandberg TCD 330

 The TCD330 is the top model in the Tandberg range of cassette tape recorders and in many ways compares favourably with open reel machines; 3 heads, source abd tape tests, editing facility, 3 motors, completely electronic controlled, remote control, servo controlled winding, dual-capstan closed-loop tape path, and dual Dolby.

Stable tape transport. Full control over tape movement with exceptionally gentle tape handling.
Memory function.
Tandberg developed input circuits, optimized for minimum noise regardless of source impedance.
Peak indicating meters - the only correct way to measure sound level after equalization. Also indicate playback level.
Editing facility.
Decoder for recording Dolbyized FM programmes.
Built-in MPX filter.
Matched to all types of good quality tape.
Adjustable output level.
Automatic stop for wind and rewind.
Front jack for stereo headphones.
The TCd330 is delivered in teak or rosewood,( oak or walnut to order)
 Tandberg was the first company in the world to design a cassette tape recorder with a combination of 3 motors and an advanced tape transport called the dual-capstan closed-loop system. On the TCD330 we have taken the development a stage further and included professional features and facilities normally found only on the most advanced open reel machines. This means that with the TCD330 Tandberg is setting new standards with the application of advanced technology, professional facilities and a professional performance for cassette machines.

3 Heads. Source and tape tests as you record.
This facility has been normal on open reel machines for many years, but it has been missing on cassette machines. Teh TCD330 has separate record and playback heads placed in the tape path where they enable you to listen to the recording as it takes place, but a fraction of a second after it has been recorded (tape test). With this facility we have fully expolited the advantage of 3 separate heads located in the correct places.
 Completely Logic Controlled.
All the operational modes are logic controlled - including even the cassette eject mechanism. The control system is an "electronic brain" with integrated circuits. This corresponds to several hundred transistors and provides a very compact and reliable design. Regardless of how you use the mode buttons, the "electronic brain" always ensures that the tape flows smoothly and is not damaged. The TCD330 has 3 motors controlled by electronics. The two reel motors are connected directly to the reel spindles while the third motor controls the capstans. The number of moving parts has been reduced to a minimum - a big advantage because all mechanism sooner or later wear out and need adjusting or replacing. The advantages with electronic control of teh TCD330 are first and foremost, no mechanical time delays between operational modes and second, all operation times are minimal.

Rapid Servo-controlled Winding.
The TCD330 winds and rewinds rapidly and has an automatic electronic servo-system controlling the wind/rewind speed. The design problem is that the tape can easily be streatched at the ends if the speed and winding power are too great. We solved this problem by automatically reducing the speed as the tape gets near the end. So the tape speed is always correct an the tape is never exposed to powerful tugs when it stops.
 Azimuth Adjustable on record Head.
The critical stage in the recording process is where the tape crosses the record head. Correct reproduction of the highest tones is very dependent on the angle between the tape and the head face. The angle must by 90° to achieve the best performance. A 10° error will give 6 dB loss at 15 kHz, and 15° error will give 6 dB loss at 10 kHz.
The tape path is always slightly different from one cassette to another because of small deviations in cassette construction. So the tape/head angle will not always be 90°. The TCd330 has a simple, built-in head - angle adjustment facility that allows you to set the head exactly to 90° for any cassette. So you get the best results from every cassette.
 Editing Facility.
Another important advantage with the TCD330. because you can go over directly from playback to record without going via stop, you can edit tapes and clean-up recording overlaps in a simple, precise way without clicks.

The Dolby B Circuits.
The TCD330 Dolby B circuits are used for normal record and playback operations and to record so-called "Dolbyized FM programmes" in stereo. Increasingly more countries are transmitting stereo programmes on FM using Dolby noise reduction systems.  These programmes are virtually free from hiss at the transmitter. But to take advantage of this improvement in the programme quality and to restore the correct frequency response the reproducing equipment must include a Dolby decoder. The decoder can be either in the radio receiver or in the tape recorder. With the Dolby N.R. button in the position "FM" the TCd330 acts as a decoder.
Tape Speed:  1-7/8 i.p.s.
Speed Tolerance:  ±05%
Wow and Flutter:  0,18% (peak DIN 45 511); 0,12% (WRMS)
Frequency Response (DIN 45 500):  20 - 20,000 Hz (30 - 18,000 Hz, ±3 dB)
Signal-to-Noise Ratio:  65 dB (weighted, DIN 45 500); 55 dB (unweighted , DIN 45 500)
Crosstalk Attenuation:
Side 1 to side 2 :  60 dB
Track 1 to track 2 :  35 dB
Harmonic Distortion:  0,3%(from amp. At 0 dB); 3% (from tape at 0 dB record level)
Input Sensitivity/Impedance (max. Voltage at 400 Hz)
Mic : 0,15 mV - 20 mV
Line : 80 mV - 10 V/ 470 k Ω
Radio : 8 mV-1 V/47 k Ω
Output Voltage/Load Impedance (with unlouded output or power output for each channel)
Radio : 0,775 mV/5 k Ω
Line : 1,5 V/0,1 k Ω
Headphones : 5 mV/8 Ω
Power Requirements:  115 V, 230 V,  50 or 60 Hz
Power Consumption:  40 W
Dimensions (W x H x D):  470 x 105 x 230 mm (18-1/2 x 4-1/8 x 9-1/8 inches)

Weight:  6,6 kg (14,5 lb)

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