Page 31 Advertisement 1

Radio Record, Volume III, Issue 10, 20 September 1929, Page 31

RC.A_ Developed Screen-Grid Radiotrons; then the Screen-Grid Circuit AND NOW THE AMAZING NEW SCREEN GRID R.C.A: RADIOLAS 44 and 46 The new RCA Screen-Grid Radiotron-~a very remark- able advance in valve design _has made possible the con- struction of a simplified Radiola receiver of amazingly high efficiency: This new Radiotron of great_ amplifying power has been for years under test and development: A special circuit had to be devised to make full use of 'its remarkable capabilities: The same RCA engineers who developed the valve; and then the circuit, have now designed Radiolas 44 and 46 to make the most efficient Ase of the Screen-Grid Radiotron in radio receivers operated with alternating current: The new Radiolas utilise only fve valves three of which are Screen-Grid Radiotrons: There is also employed a new RCA No. 44 power-amplifving Radiotron, with capacity for much greater yolume without distortion: The beauty. of tone achieved in these new Radiolas has never before been possible in receiving sets employing SO few valves. The full rich tones of the bass register are a revela- tion in radio reproduction: Radiola 44 (table model) is in a compact, two-tone walnut veneer cabinet of graceful design: The console model, Radiola 46,_ makes use of the finest of all reproducers, the famous RCA Electro-Dynamic Speaker, an integral part of the assembly. Among the interesting refinements in the new instruments are the concentric, Or stwo-in-one" tuning and volume control, Tqowya the special switch to maintain high quality_ of reproduction for both distant and Jocal stations, and the selector dial gradu- ated for kilocycles, with readings magnified On an iluminated window. Again ~all the world s knowledge of radio in these newest RCA Radiolas the product of the world $ greatest radio research laboratories: Ie CAL IRRAl IDDI@ILA Made by the Makers gf the Radiotron RCA No. 46 JRLDMDt Amalgamated WIRELESs Wireless ~Australasia) Ltd BOX 830, WELLINGTON