Trade Jottings

Radio Record, Volume V, Issue 11, 25 September 1931, Page 12

Trade Jottings

Qsram Valves QNLY a short while ago a new range of Osram 2.5 volt replacement valves was introduced by the British General Hlectric Company to the New Zealand market. The principal valve of the range is the MY227, a replica of the standard 227, for it has the regular characteristics. Particularly careful _ attention has been given to the construetion of this valve. The particular object in mind is to eliminate microphonic

: atv noises, and in achieving this a special band of double mica bonding top and bottom is incorporated. ‘The second of the series, the MY224, has been similarly very carefully constructed, and is, indeed, a good valve. The 245 and 280 are both exact replicas of the American type valve, and are giving excellent service. Commenting on the 280 valve one set manufacturer stated: "An MX280 was operating in the standard set, when a blocking condenser broke down. ‘The rectifying valve became quite hot. It stood this for several minutes, and when the set was repaired again took‘its place in the socket. To our surprise it performed equally well as a new one tried immediately afterwards." ‘The Osram Manufacturing Company intend to follow up the American series by the 551 variable-mu and the 235 variable-mu, and also the 247 pentodes. It is hoped that these new valves will be shortly available on the New Zealand market.