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" offers the finest
IRRESPECTIVE of COST for Critical
ROXY all-frequency Soundhead:— The sound reproduction unit which forms the heart of the talkie system is the finest in the world and is years ahead in design to other makers.
The drum over which the film passes drives a huge extra heavy size flywheel weighing several pounds through a double balanced gearless friction drive the design of which is such that the flywheel runs at about twice the speed of the film drum. This always keeps the speed of the film drum absolutely steady and constant and ensures the finest reproduction of the highest notes, which are lacking in most of the sound heads on the market. The optical system is of the highest quality and possesses exceptional precision and brilliancy of the light slit and guarantees reproduction of the highest frequencies and gives to the reproduction the clearness of the spoken word and true-to-life tonal effect of musical instruments. The length of the light slit and its position can be easily altered to suit varying sound track conditions and further the length of the light-slit can be narrowed even while the machine is running. The exciter lamp used is of the microscopically prefocussed type and is instantly interchangeable. As it is prefocussed no operator however ignorant he may be, can make any mistake when replacing the exciter.
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"DE-LUX" Panel Type Amplifiers
These are the highest grade of amplifiers it is possible to make and have an undistorted speech output 40% greater than the Excello amplifiers. They are tropical zone impregnated and specially designed for the Indian climate. They are built in two units: —
The smaller one, the "HSW" amplifier contains the pre-stages and use the following valves:
1 x AF 7; 1 x AC 2; 1 x AD 1 & 1 x AZ 1.
Fitted with: 2 photo-cell sockets. 2 photo-cell voltage regulators; connections for gramophone and microphone; filmgramo-mike change over switch; volume control; milliampmeter; neon indicator; and main switch.
The bigger one, the "HEW" amplifier contains only the endstage and uses the valves given below: —
2 x RV 239 & 2 x RGN 1404.
Fitted with: & main switch.
-Milliampmeter
The De Lux amplifier has a frequency curve flat from 40 to 12,000 cycles and its tonal quality is superb. This amplifier is recommended for use with the "Hi-Lo-PHONIC" Speakers, because of their frequency range. It is supplied mounted on the Panel which takes the following accessories and as per photo
1939.
'De-Lux" type Panel type Amplifier.