The Differential Series

Radio Record, Volume IV, Issue 49, 19 June 1931, Page 17

The Differential Series

Reader’s' Experiences THE following are a reader’s experiences with the "Differential Series" :-"The Differential One is a splendid set, and with it I logged nearly all the New Zealand stations, and many of the A class Australians, with plate voltage of 45, Aerial is 20 feet high at both ends and 100 feet, long, including lead-in. I then added a stage of audio, and I received 1, 2 and 3YA on speaker with plenty of volume after 8.30 pm. I then added a second audio, and increased plate voltage to 90, Then trouble began. -I took. everything apart, tested all components, replaced condensers, tried another transformer in second audio, then. put everything back, but could hear nothing else but "crack, crack, crack,’ music for a few "Seconds, and then more crackling. I tested everything once more, this time including the batteries, and here was my trouble. My new 45-volt battery was not giving a kick at 45, and at 224 just an occasional flicker. I tore the easing off and found connecting wires broken in two places and the cells furred. I then made a_ three-valve -S.G., det., and pentode-and if the ‘Kestrel Three’ is to be anything like it I can vouch for it. Mine works splendidly, and tone is all that anyone can wish for.’-G. G. Kendall .(Has tings). ,