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 3500X

 Unsual facilities.
The 3500X has unsual facilities for record and playback. The Tape/Source buttons determine whether record monitoring will be a source (programme0 test or a tape test (A test or B test). The tape test is particularly useful because you can listen to tape that has just been recorded while the recording continues.
Tape recorder 3500X is suitable for every music installation.

A model in geat demand in the middle price bracket with a good performance and many attractive features. Suitable for all Hi-Fi music centers providing record/playback in stereo or mono with excellent sound quality. The 3500X is designed for connection to a good quality stereo amplifier such as the Selvsuper, the Huldra or the TR 220.
 The recording quality determines the sound quality.
The playback quality of a tape can never be better tahn the recording quality. A tape recorded on a poor tape recorder can never be improved even when it is played back on a god machine. Tandberg has always paid particular attention to this point when designing tape recorders. The Tandberg Crossfield technique was specially developed to raise the recording quality. The tape transport and the tape path have been designed to allow the tape to pass smoothly and precisely across the heads without undue strress and strain. The heads have been developed and manufactured by Tandberg to exploit the best features of the latest types of tape. Everything possible has been done to ensure that the recording quality is excellent.
Even though the 3500X is reasonably prieced it is fully equpped to play a central role in any Hi =Fi music centre.
Tandberg Crossfield recording technique
3 speeds; 7½, 3¾, and 1 ips.
4 heads
Precise control of record and playback levels with slide potentiometers
Large peak indicating meters - the best way to measure programme levels
Easy editing with direct switchover from playback to record
Tape and source monitoring during recording
Trick recording facilities: sound-on-sound; echo; mixing in mono
Front jack for stereo headphones

The photo-electric stop
Model 3500X is equiped witha photo-electric stop. The tape passes between a lamp and a photo-transistor. At the end of the tape or when the tape is transparent, the forward drive stops automatically.

Tape Speeds:  7½, 3¾, and 1 ips
Speed tolerance ± 1 max.
Wow and Flutter (Peak Din 45 511 / Weighted RMS) 
7½ ips : 0,1% / 0,07%
3¾ ips : 0,18%/ 0,12%
1 ips : 0,35%/ 0,25%
Frequency Response (DIN 45 500 / ±3 dB):
7½ ips : 30-26,000 Hz /30-22,000 Hz
3¾ ips : 30-20,000 Hz / 40-18,000 Hz
1 ips : 30-11,000 Hz / 40-9,000 Hz
Signal/Tape Noise Ratio: 
IEC, A-curve (DIN 45 500, weighted) : 64 dB
IEC, unweighted RMS (DIN 45 500, unweighted) : 75 dB
Crosstalk Attenuation (at 100 Hz minmimum):  60 dB Mono; 50 dB Stereo
Harmonic Distortion:
From amplifier at 0 dB : 0,3%
From tape at 0 dB recorded level : 3%
Inputs Impedance/Sensitivity (max. Voltage):
MIC : 130 µV/25 mV
Radio : 50 k Ω/8 mV - 1.2 V
Line : 500 k Ω/100 mV - 10 V
Radio, Line : 5 k Ω/1 V
Headphones : 100 Ω/1 V
Power requirements:  115/220/230 V 50/60 Hz
Power Consumption:  45 W
Dimensions (W x H x D):  400 x 180 x 410 mm (15¾" x 7" x 16")
Weight:  9,1 kg (4 ¼ lb)

Finished:  Wood veneers in teak or rosewood  (oak or walnut to order)

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