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-2025

 The TR-2025 completes the TR 2000 series - 3 top models to meet a variety of needs and pockets. The stereo FM section has pre-tuning for 5 stations. The power amplifiers deliver more than 2 x25 watts in 8 ohms over the complete frequency range from 20 to 20,000 Hz with less than 0,15% total distortion.
 The FM Section Features
Excellent stereo tuner.MOSFET, IC's, and 3x 4-pole ceramic filters providing extremely good sensitivity and selectivity.
Automatic switchover to FM Stereo
Automatic frequency control (AFC) disconnects itself during tuning and connects itself again when tuning is completed. Can also be operated manually.
Heavy flywheel gives smooth, precise tuning.
Muting for quiet tuning.
 DiN sockets for 2 tape recorders. Both inputs have Tape Monitor facility
Input for transcripton unit (mag. p.u.)
Copying facilities for 2 tape recorders simultaneously
Low and High filters
Frequency / loudness compensated volume control
Front output jack for stereo headphones
Specifications
Amplifier Section
Output Power per channel, sine wave, with 1 kHz in 8 Ω /4 Ω:   32 W /40 W.  Both channels driven simultaneously DIN 45500
Output Power per channel , sine wave, from 20 to 20,000 Hz in 8 Ω:   25 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):  65 (25) 20-20,000 Hz
Frequency Response (from linear inputs (-15 dB):  8 - 50,000 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 : +9 dB
Low Filter -12 dB/oct, -3 dB at 70 Hz
1 High Filter  -12 dB/octave, -3 dB at 8 000 Hz
Input Sensitivity (nominal  output power in 8 Ω):
Tape 1 : 170 mV
Tape 2 (Extra) : 170 mV
Phono 1  Magn. (cer) : 2,3 mV
Signal-to-Noise Ratio (2x50W in 8 Ω according to DIN 45 500):
Tape 1 : 61 dB
Tape 2 (Extra) : 61 dB
Phono 1 : 60 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 : 70/72 dB
Weighted (according to DIN), Stereo/Mono : 60/62 dB
Unweighted (according to DIN) , Stereo/Mono : 63/65 dB
Distortion (according to DIN), Stereo/Mono :  0,4%/0,2%
Selectivity (according to IHF), ±400 Hz :  75 dB
Image Frequency Rejection Ratio:  70 dB
AM suppression:  65 dB
IF Rejection:  95 dB
Limiting (-3dB) with 75 Ω aerial impedance:  0,7 µV
Muting Thereshold with 75 Ω aerial impedance:  3 µV
Capture ratio:  1,5 dB
Channel Separation (accor. to DIN 45 500):  40 dB
Pilot Tone Suppression (accor. to DIN 45 500):  55 dB
38 kHz Suppression (accor. to DIN 45 500):  55 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):  515 x 143 x 320 mm (20½" x 5¾" x 12¾")
Depth with knobs:  322 mm (13¼")
Weight:  8,3 kg (19 lbs)

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