GEC741

Catalogue number TEW 310000

Exterior
Case and handset moulded in ABS high-impact plastic, dual grey (the handset, cord and dial surround are the darker tone), black, and ivory. The case can be removed completely for maintenance.

Cord
PVC covered cadmium-tinsel-conductor cord. Held in position by grommets which relieve conductors of any stresses.

Handset cord, coiled;- 250 mm (10 in) unextended; 1700 mm (68 in) extended.

Cradle switch
Sealed microswitch.

Dial
Characters printed black on antique-silver background beneath clear plastic finger plate. Trigger type and self-compensating action. Projects through self-centring ring on case. No appreciable variations in pulse ratio after 41 million impulses.

Speed: 10 IPS (20 IPS version available).

Inter-digit pause: 240 ms minimum.

Break-to-make ratio: 2 to 1 (other ratios can be supplied).

Transducers
Receiver inset: Rocking armature, replaceable capsule; sensitivity, +46 dB relative to 1 dyne/cm squared/mW available power.
Transmitter inset: Carbon granule, replaceable capsule; sensitivity +30 dB relative to 1mV/dyne/cm squared at 20 dynes/cm squared input.

Regulator
An automatic volume regulator is fitted to limit speech-signal amplitudes on lines shorter than 400 introduces virtually no attenuation on longer lines.

Signalling
Double-coil ringer; DC resistance 1000 ohms; accepts ringing currents between 16 and 30 Hz; bells, double gong, harmonising tones. Extension bell (BE1100 or BE1200 series) can be provided for noisy surroundings.

Environment Suitable for use in tropical climates.
Protected against entry of insects.

Dimensions and Weight
Complete telephone:
height, 230 mm (9 in)
width, 250 mm (10 in) over handset; 140 mm (5.5 in) over case
depth, 110 mm (4.5 in)
weight, 1.7 kg (3.5 lb)

Handset:
230 gm (8 oz).

Taken from a GEC-AEI Telecommunications Ltd publication 1971

Last revised: 15 May, 2005