Laboratory Jottings

Radio Record, Volume III, Issue 12, 4 October 1929, Page 12

Laboratory Jottings

oe Pierce Airo BH have received from the Rodger Importing Company, Christchurch. a-sample of the new Pierce Airo AllBlectric. This new model, designed on the lines of the battery model Pierce Aero, will fit into a table cabinet designed for its predecessor. There are seven valves-four 226’s, one 227, two 171A’s in push-pull. Rectification is carried out by means of one 280. The circuit is a balanced neutrodyne, neutralised by the grid supressor method. The audio stages are transformer coupled. Single-dial eontrol with a compensator allows of the greatest simplicity with highest efficiency. When the speaker is carried at a reasonable distance from the set there is no hum. The tonal qualities are excellent, its sensitivity is very good, and its. selectivity almost perfect. A local station disappears in a .very few degrees of the dial. An earth is not required, as automatic earthing takes place through the set. It is fully shielded, and provision is made for line voltage compensation During the test the following sta.

stions were logged:-i1YA, 2YA, 2YB, 3YA, 4YA, 2ZL, 4ZC, 2BL, 2FO, 2UH, 8LO, 3AR, 4QG. 5CL, 7ZL, JOHK, JOFK, all on the speaker at good volume. Quite frequently the writer listened through an Australian programme while the local was operating, 2BL was received during its afternoon session. Mr. Eric Shipley, 185a Manchester Street Christchurch, is the Canterbury agent. Further agencies are required throughout New Zealand.