Characteristics of Valves

Radio Record, Volume II, Issue 9, 14 September 1928, Page 8

Characteristics of Valves

Under the auspices of the Wellington Amateur Radio Society, Mr. W. M. Dawson, a technical expert of experience, has agreed to give a fortnightly lecture from 2YA on various aspects associated with listening. The first lecture will be from 2YA on the evening of September 15 at about 7.40, and will deal with the "Characteristics of Valves." The diagram given below should be kept available by listeners, as reference to it will be made during

the course of the lecture and explanations given. Another feature of the lecture will be an explanation of the characteristes of different valves, and an explanation of the symbols used in explaining them. These symbols are outlined below. Their meaning, and the characteristics to be looked for in respect of proper use of valves, will be explained by Mr. Dawson. Filament voltage .......... Vf Filament Current ........ if Anode voltage ..ccescoeees Va Total emission ....cecssee. IS Amplification factor ...... g Mutual conductance (Slope) §S Internal resistance ...... .- Ri Negative grid bias ........ Vg Normal anode current .... Cag Largest diameter .......... 4d Length encccccccscccsesce Lb