Tape Recorder Series 12 12-41 60 Hz, 115 Volt

Tandberg Series 12 Four-Track (U.S. version) Teak wood cabinet.

Tape speed:
7½, 3¾ and 1⅞ inches per second. The amplifiers are equalized to conform with NAB standards.
Playing time:
Four-track recordings on 1200 ft. of tape:
Tape Speed:
Tape speed 7½ i.p.s.: Stereo 32 min. Mono 2 x 32 min.
Tape speed 3¾ i.p.s.: Stereo 64 min. Mono 2 x 64 min.
Tape speed 1⅞ i.p.s.: Stereo 128 min. Mono 2 x 128 min.
Fast wind and rewind:
The fast wind or rewind of 1200 ft. of tape takes approx. 2 minutes.
Recording tape:
Maximum reel diameter 7". Good quality recording tape is recommended.
.Frequency response:
7½ i.p.s. 30-20.000 Hz (+/-2 dB 40-16.000 Hz
3¾ i.p.s. 30-13.000 Hz (+/-2 dB 50-10.000 Hz
1⅞ i.p.s. 30-7.000 Hz (+/-2 dB 60-5.000
In AMPLIFIER position: +/- 2 dB 30-16.000Hz
Distortion:
The distortion from the record amplifiers is less than .5%.
The distortion from the playback amplifiers is less than .5%.
Wow and flutter:
Better than .1% at 7½ i.p.s tape speed.
Better than .15% at 3¾ i.p.s tape speed.
Better than .25% at 1⅞ i.p.s tape speed.
Erase and bias frequency:
The erase and bias frequency is 85.5 kHz. The even harmonic distortion in the bias current is less than .5%.
Recording level indicator:
The electronic beam indicators are equipped with damping circuits. The indicator range is 25 db, plus overload.
The indicators are closing at optimum recording level (5% distortion from the tape).

Inputs:

2 Microphone inputs (ch. 1 and ch. 2): Impedance: 200 ohms unbalanced. Sensitivity: 150uV. Dynamic range +40 db.
2 Line inputs (ch. 1 and ch. 2):
HIGH LEVEL: Impedance; 1 Mohm. sensitivity: 75 mV. Dynamic range +40 db. Contact: Phono contacts and DIN connector marked CR PHONO (pin No. 3 and 5).
LOW LEVEL: Impedance; 100 kohm. sensitivity: 7.5 mV. Dynamic range +40 db. Contact: Phono contacts and DIN connector marked RADIO (pin No. 1 and 4).
FM-Multiplex inputs:
The model 12 tape recorder is furnished with a FM-Multiplex switch which switches the multiplex filter in or out.

Outputs:

Playback Preamplifier output:
Internal impedance is 5 kohms. Open circuit output voltage 750 mV, independent of the settings of all switches and controls during playback. Two phono contacts (ch. 1 and ch. 2) are furnished for connection to external power amplifier.
Low Impedance output:
External impedance is 4ohms. Two standard telephone jacks (ch. 1 and ch. 2) in parallel with two DIN loudspeaker contacts are furnished for connection to external loudspeakers.
Centre Channel output:
Impedance is 82 ohms from each amplifier. Output voltage in record position is 750 mV open circuit. Output voltage in playback position and amplifier position (AMP) is maximum 3 volts open circuit. One standard telephone jack in parallel with one DIN loudspeaker contact are furnished for connection to headphones.
Power output:
Maximum output power is 10 watts in each channel. Two standard telephone jacks (ch. 1 and ch. 2) in parallel with two DIN loudspeaker contacts are furnished for connection to external speakers.

Speakers:
Two speaker 7" x 4".

See also 220 volt 50 Hz version.

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