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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 TR-2055

 The Audio Section Features
Adjustable sensitivity for one of the transcription unit inputs and for both the tape recorder inputs.
2 inputs for transcription units,and 2 tape recorders.
Both tape recorder inputs have a Tape Monitor facility.
Copying facilities for 2 tape recorders
Front output jack for recording a tone-controlled programme (Tape Contour Out)
Frequency/Loudness compensated volume control
2 filters, low and  High
2 front jacks for stereo headphones
Light diode indicators (LED) for the most important operational modes
Recommended speakers; Tandberg Studio Monitor 
 The FM Section Features
MOSFET transistors, 4-pole ceramic filters and integrated circuits (ICs).
Automatic switchover to FM stereo with illuminated indicator.
Electronic tuning. Heavy flywheel making tuning a pleasure.
Muting for quiet tuning.
Large tuning and signal strength meters for spot-on tuning.
FM 25 µs de-emphasis switch for use with external Dolby decoder when receiving FM Dolby broadcasts.

The AM Section Features
2 MOSFET transistors in the HF stage and the mixer provide equally good reception with strong and weak aerial signals.
2 tuned RF circuits mean that the signal/noise ratio is excellent and the image frequency rejection ratio is greater than 90 dB.
Specifications
Amplifier Section
Output Power per channel, sine wave, with 1 kHz in 8 Ω /4 Ω:   60 W /80 W.  Both channels driven simultaneously DIN 45500
Output Power per channel , sine wave, from 20 to 20,000 Hz in 8 Ω:   55 W.  Both channels driven simultaneously. 0,15% Distortion
Distortion (with output power 1 dB below nominal and lower at 1 kHz in 8 Ω (4 Ω):  0,08%
Intermodulation (according to DIN 45 500):  0,15%
Damping Factor (nominal output power in 8 Ω (4 Ω):  50 (25) 20-20,000 Hz
Frequency Response (from linear inputs (-15 dB): 76 - 80,000 Hz
Channel Separation (at 1 kHz minimum):  60 dB
Tone Controls: 
Treble  Control at 10 kHz : ±15 dB
Frequenzy/Loudness at 10 kHz : +3 dB
Bass Control at 50 Hz : ±15 Hz
Frequency/Loudness at 50 Hz : +8 dB
Low Filter -12 dB/oct, -3 dB at 70 Hz
1 High Filter  -12 dB/octave, -3 dB at 8 000 Hz
2 High Filter -6 dB/octave, -3 dB at 8 000 Hz
Input Sensitivity (nominal  output power in 8 Ω):
Tape 1 : 150 - 600 mV
Tape 2 (Extra) : 150 - 600 mV
Phono 1  Magn. (cer) : 2,2 - 10 mV
Phono 2 Magn. (cer.) : 3,0 mV
Signal-to-Noise Ratio (2x50W in 8 Ω according to DIN 45 500):
Tape 1 : 62 dB
Tape 2 (Extra) : 62 dB
Phono 1 : 60 dB
Phono 2 : 58 dB
Tuner Fm Section
Wave Band:  87,5 - 108 MHz
Frequency Response (-3dB):  20 - 15,000 Hz
Sensitivity in Mono (for 26 dB S/N accor. to DIN 45 500 with 75/300 Ω aerial impedance):  0,8 µV/1,6 µV
Sensitivity in Stereo (for 46 dB S/N accor. to DIN 45 500 with 75/300 Ω aerial impedance):  20 µV/40 µV
Signal-to-Noise Ratio (with 1 mV aerial voltage):
Unweighted (according to IHF),  Stereo/Mono : 75/78 dB
Weighted (according to DIN), Stereo/Mono : 62/66 dB
Unweighted (according to DIN) , Stereo/Mono : 65/68 dB
Distortion (according to DIN), Stereo/Mono :  0,15%/0,15%
Selectivity (according to IHF), ±400 Hz :  80 dB
Image Frequency Rejection Ratio:  70 dB
AM suppression:  70 dB
IF Rejection:  95 dB
Limiting (-3dB) with 75 Ω aerial impedance:  0,7 µV
Muting Thereshold with 75 Ω aerial impedance:  4 µV
Capture ratio:  0,9 dB
Channel Separation (accor. to DIN 45 500):  40 dB
Pilot Tone Suppression (accor. to DIN 45 500):  70 dB
38 kHz Suppression (accor. to DIN 45 500):  60 dB
General
Cabinet:  Delivered in Teak, Rosewood or Walnut
Mains Voltage:  240 V 50.60 Hz (internal tappings for 120-220-240 V)
Dimensions (W x H x D):  510 x 153 x 353 mm (20" x 6" x 14")
Depth with knobs:  377 mm (15")
Weight:  13 kg (28-3/4 lbs)