Page 29 Advertisement 1

Radio Record, Volume III, Issue 31, 14 February 1930, Page 29

The 91 BLUE SPOT Patent Four Pole, Double Balanced Armature; Driving Unit TYPE 66K Generally accepted by the technical pregs and trade 48 the finest movement available for driving a cone, tbe Blue Spot Unit stands unrivalled a8 2 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: '66K is essentially 2 completely discharged 4-pole magnet unit which drives the cone spindle through 2 perfectly straight line move- ment: The special steel used for the magnet permits of an enormous dux, thug making the unit exceptionally sensitive. The armature ~the only part liable to give a natural resonance has been carefully damped and ig to all intents and purposes dead silent in action. The unit reproduces all audio frequencies from 50 to 7,000 cycleg without giving undue prominence to either end of the register: 66K has 2 gpecial adjustor for regulating the gap be- tween the butterdy piece and the four poles of the magnet 66P. Retail Price, 3316 TRADE PRICES UPON APPLICATIUN. Nz Agents: RODGER IMPORTING CO, LTD. 159 MANCHESTER STREET, CHRISTCHURCH