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 300

 The Tandberg Series TCD 300 (1972) Stereo is an entirely new cassette tape deck which meets the specifications set forth in DIN standard 45500 for high fidelity equipment to full satisfaction.  Designed and manufactured at the Tandberg Radiofabrikk in Norway, Series TCD 300 meets the stringent quality requirements imposed on all Tandberg tape machines.

Specially Features:
Complies with high fidelity specifications set forth DIN 45500 Standard.
Hot pressed ferrite heads.
Dolby noise reduction system.
3 motors provide fast forward/rewind and precise record/playback.
Hysteresis synchronous drive motor.
Dual capstan closed loop ensures ideal tape handling and maximum stability.
Two illuminated peak reading equalized recording and playback indicators.
Minimum wow and flutter.
Low Noise/CrO₂ Tape Switch.
Electronic Controls.
Microphone preamplifiers.
Linear motion potentiometers for input levels.
Automatic  end-stop.
Wall mountable and horizontal or vertical use.
 Dual Capstan Closed Loop Tape Drive
This special tape handling system proides two capstan/pinch-roller systems that determine the position and orientation of the tape relative to the sound heads. This system ensures absolutely stable tape handling as well as minimum wow and flutter. Best possible results are obtained even with worn cassettes.

Three Motors
The Tandberg Series TCD 300 has three motors; one hysteresis synchronous motor and two Dc reel motors. The 2 separate winding motors make it possible to reduce the full-length winding time for a C60 cassette to about 40 seconds.
The tape handling mechanism feature rugged design and construction to assure excellent stability and reliability. Motors turn off automatically at end of tape for both recording/playback and fast forward/rewind, and the pinch rollrs disengage tape. This eliminates risk that the tape will remain under pressure or in tension while the tape deck is not in use, and thereby riun the cassette.
 Sound Heads
Because the sound heads used in Series TCD 300 are made of hot-pressed ferrite they can be guaranteed against wear throughout the service life of the tape deck.

Dolby System
The Tandberg TCD 300 Stereo features a built-in Dolby noise reduction system. This system reduces tape noise by about 10 dB relative to conventional systems and enables the Series TCD 300 to satisfy the signal/noise ratio requirements set forth in DIN 45500 standard. The Dolby system is of special importance in a cassette tape machine for four reasons: tape noise is high,  tape are narrow, magnetic coatings are thin and tape speed is low. The Dolby system can be switched on and off.

Peak Reading Metters
Series TCD 300 is provided with peak reading meters that show peak recording levels. Levels are regulated with a linear motion potentiometer. These meters also show the level of the pplayback signal.

"Spec. Tape" Switch
The Tandberg Series TCD 300 is compatible with the most modern types of tape. This two-position selector switch can be set either for low noise, high output (LH) tape and for chromium dioxide (CrO₂) tape.  CrO₂ switch position makes all four adjustment necessary for optimum recording with this kind of tape; record equalization, record bias, play equalization and erase current.

Tape Speed:  1-7/8"  / sec. (Speed Accuracy ±1%)
Frequency Response:
LH ; 30 - 15,000 Hz
CrO₂ : 30 - 16,000 Hz
Signal-to-Noise Ratio:
LH Tape, Normal Position/with DOLBY :
51 / 59 dB (IEC A-curve,3% THD)
48 / 52 dB (IEC Linear RMS, 3% THD)
45 / 53 dB (DIN 45511 unweighted)
45 / 50 dB (DIN 45511 weighted)
 CrO₂ Tape, Normal Position/ with DOLBY
54 / 62 dB (IEC A-curve,3% THD)
50 / 52 dB (IEC Linear RMS, 3% THD)
48 / 56 dB (DIN 45511 unweighted)
48 / 50 dB (DIN 45511 weighted)
Wow and Flutter:  0,15% WRMS
Crosstalk Attenuation (by 1 kHz):
Side 1 -Side 2 : better than 60 dB
Track 1 - Track 2 : better than 35 db
Total Harmonic Distortion:
From Rec Amp (by 0 dB impact) : less than 0.5%
From Playback Amp (by 0,775 V) : less than 0.3%
From Tape ( by 0 dB rec level) : less than 3.0%
Inputs Sensitivity/Impedance:
Amplifier, Tuner : 8 mV/47 k Ω (Max. Input by 400 Hz : 0,8V)
Yape In : 40 mV/100 k Ω (max. Input by 400 Hz : 4 V)
Microphones : 0,1 mV/ * (Max. Input by 400 Hz : 10 mV)
(* Impedance customized dynamic microphone with an impedance lower than 700 Ω)
Outputs Impedance/ Voltage (Tape Out and Amplifier/Radio in parallel): 10 k Ω/0,775 V (unloaded)
Semiconductors:  47 Transistors; 2 FETs
Power Requirements:  230 V, 50 Hz
Power Consumption: 34 W
Dimensions (W x H x D):  430 x 105 x 230 mm (16-7/8" x 4-1/8" x 9-1/14")
Weight: 6,5 kg (14,5 lbs)
Finish Cabinet:  teak, rosewood or oak

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