Page 13 Advertisement 2

Radio Record, Volume III, Issue 16, 1 November 1929, Page 13

The 66 19 BLUE SPOT Patent Four Pole, Double Balanced Armature, Driving Unit TYPE 66X Generally accepted by tbe technical piess and trade 2s the finest movement available for driving a cone, the Blue Spot Unit stands unrivalled as a means of providing faithful reproduction. If you are pushing any particular type of receiver, however good it is, and whatever claims you make for it, you will find that your biggest selling help will be obtained by coupling to it a Blue Spot Unit: 68K is essentially 2 completely discharged 4-pole magnet unit which drives the cone spindle through a perfectly straight line move- ment. The special steel used for the magnet permits of an enormovs flux; thus making the unit exceptionally sensitive. The armature; ~the only part liable to give a natural resonance has been carefully damped and is to all intents and purposes dead silent in action: 'The unit reproduces all audlio frequencies from 50 to 7,000 cycles without giving undue prominence to either end of the register: 66K has 2 special adjustor for regulating the gap be- tween the butterfly piece and the four poles of the magnet: Retail Price, 3216 TRAIE PRICES UPON APPLICATION. N Agents: RODGER IMPORTING CO, LTD. 159 MANCHESTER STREET, CHRISTCHURCH