Trade Developments

Radio Record, Volume II, Issue 37, 28 March 1929, Page 8

Trade Developments

The Airzone "Three"

(By

Observer

THE cothing. season is certain to see very many. interesting developments regarding new apparatus. Nothing radically new is- to be expected, though improvements,. both in function and design, will be continually. coming before the notice of the public, and it is the purpose of "Observer". in these columns, to briefly review these new models with a view of interesting radio listeners. Coo z, The Airzone "Three": has been submitted for test and. report, and has proved equal to anything of its type yeh tested. The design is indeed unique. Tye set, with the exception of the. batterits and the speaker, is housed in a little metal case, the over-all dimensions not exceeding 12x8x6. This is finished in blue crystalline. There are three dials, tuning, reaction, and rheastat, and these are artistically arranged 30 as to give the whole outfit a very. neat

and balanced appearance. Poy There is nothing unusual about the circuit, but everything is arranged from the point of view of maximum ef-ficiency-and it has been obtained. The arrangement of the valves are detector and two audio. These are of the Con- . tinental type, and the set can thus be worked from dry batteries, though an accumulator would be preferable if the set was to be used for long intervals. As sent out by the distributors, it is capable of handling great volume without distortion. A test was made from 2YA, and with 150 to. 200 volts on the plate of the last valve and ‘80 on the ’ detector valve, tremendo@s volume without distortion was realiged, and it would have been possible to have conducted a dance to the music. As for distance getting, the set is still on test, and a further report of this nature will be published at a future date,