The "Six Sixty" Products

Radio Record, Volume II, Issue 39, 12 April 1929, Page 31

The "Six Sixty" Products

Reviewed by "Observer" IN England the "660" products have a wide renown, but to the present they have not been introduced in New Zealand. In endeavouring to secure a New Zealand agency, the Australian agents, Segal and Co., Limited, have submitted to us for test and report samples of their valves and speakers. Of the valves, three types were forwarded, HF 4075, P410, and SP 425. These are high frequency, power and super-power valves. They. have been tested under working conditions, and compared. with the generally accepted standards, and found in every, case to equal them in performance. HF 4075 is a high frequency or detector working at 4 volts, and drawing .075 of an ampere. It was found to compare favourably with valves customarily used. There was no tendency for microphonic reaction. As a single-stage amplifier to handle the output as such as a crystal set, it proved highly satisfactory. Normally the valve is of DC operation, but in one stage worked perfectly on AC. P410 is a power valve of the 112A type. Four volts are required on the filament, 150 on the plate, and .1 ampere for the filament consumption. The valve will handle considerable output without distortion and impart a sweet tone without reducing volume, 8.P.425 is a power valve requiring 4 volts filament, 150 volts. plate, and 25 amperes filament consumption. As a power valve for a_ 6-valve receiver operated- in the Wellington district, it was found to handle perfectly the output from 2YA without any trace of distortion or suppression of either low or high frequency. There was not any suggestion of harshness, and it was found on more distant stations that volume was only imperceptibly reduced. The "660" speaker is of the smaller cone type, standing about 12 inches high, and is artistically finished in dark brown. It was found to be capable of handling a medium output without distortion, and thus compares quite favourably with the generally accepted standard for small cone speakers.