New and Interesting Features

Radio Record, Volume II, Issue 20, 30 November 1928, Page 7

New and Interesting Features

Observations on Some .of the New Models

(By

Observer

T is interesting in going round town to notice the trend of radio as forecast by the new arrivals displayed by the leading dealers. Although we are rapidly approaching summer, there are some remarkably fine pieces of radio apparatus coming on to the market. Notable among these is the new electric model Crosley, on exhibition at the shops of the agents. Of these there’ are two distinct models, both fully shielded, and. encased in a handsome metal case; one is a six-valve and the other an eight, that is, including the rectifier. The larger of the two utilises two valves and two transformers in the famous push-pull" hook-up which produces immense volume without distortion. A feature of these models is single dial control with a balancing unit, to ensure perfect selectivity. Both sets are worked entirely from the A.C. mains, all recti-_ fiers and transformers being included in the neat cabinet. which in the larg est model is only 18 inches in length and ten inches wide. These manufacturers have . brought out an.attractive speaker on the dy namis principle to match the cabinet. Battery Eliminators. HE enthusiast who wishes to electrify his set without going to the expense of purchasing a new set will find a _ splendid outfit in the ABC eliminators, stocked by Messrs. L. Silver and Co., Manners Street. This type of eliminators can also be obtained for A and B separately. It is claimed that these eliminators will deliver very heavy amperage and still maintain a high voltage. This makes PTT TUAT TUT TOTT OTT AT TAG TEAT UU TTAGTTGTTT AT UGG TART GRIT ATUUATCGTUCADNTAT NEST UAT AE UE TATU

them very suitable for the new power valves that are rapidly coming to the fore. An Example of Push-Puil. PASSIN G along Manners Street, one is often arrested by . the large crowd collected around the shop of Messrs. Silver listening to the afternoon session from 2YA. ‘The deep, rich tone is remarkable. The secret is push-pull amplification such as described by "Pentode" a few weeks back. A erystal detector is employed. 'The speaker, which handles the output faithfully, is a baffled Baby cone of a popular make. Power Amplifier. A TYPE of power amplifier that should appeal to those who have need of great volume, has been constructed by Messrs. Thomas Ballinger. Running directly from the mains, this _unit can be applied to an ordinary. wireless set, short-wave set, & crystal set, a gramophone pickup, or @ microphone. The unit may be used as a speech amplifier for public addresses. Any type of speaker can be applied. While watching a demonstration, the writer was amazed at the tremendous undistorted volume supplied to a moving coil speaker. A small cone speaker was then hooked up and the same music (from a pick-up) was toned down to a whisper. It was a truly remarkable feat. This amplifier was used in conjunction with a dynamic speaker on election night, and could be heard word perfect several hundred yards away against a stiff breeze. A smaller unit is available for household use. POT TVATTUAATUTIVETUATUUATALAT TE TTTAV SG TGTIUGT GTI AT ATA ATITATUEAT CATT VPI TT UT AGEACEeSHID HUTT