BUY BRITISH!
Examinations have shown that the British have fully risen to the occasion in the matter of valve-making, and can more than hold their own not only with full ranges of all useful typos, but in dependability as a result of careful design and manufacture. Great attention has been paid to the possibilities of the two-volt valve for battery ojieratioii, and these appear to lie most popular for the largo number of home constructors. The current consumed by the two-volt screen grid H.E. variety is an average of .15 amp, the general purpose is .1 amp., and the power and super-power is from .2 to .4 amp., while peiithodcs require from .2 to .3 of an amp. The indirectly heated typo for A.C. mains receivers are made to take one amp. at four volts. The British rectifying valves can be classed in three groups, using four volts each, and consuming one amp. for the first group and two and a-half amps, for the other two groups. Each class is for full wave rectification, and will supply' sixty milliamps at 250 volts, 120 milliamps at 350 volts, and 120 mils at 500 volts for the three classes respectively. Variable-mu types are made by many manufacturers, and one outstanding specimen has a mutual conductance as high as five milliamps per volt. It is a two-volt valve with an amplification factor of 3,000 and an A.C. resistance of COO.OOO ohms.
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https://paperspast.natlib.govt.nz/newspapers/ESD19320625.2.22.5
Bibliographic details
Evening Star, Issue 21138, 25 June 1932, Page 4
Word Count
238BUY BRITISH! Evening Star, Issue 21138, 25 June 1932, Page 4
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