FAULTY GRID LEAKS.
A faulty grid leak or grid condenser may be easily detected, but without measuring instruments it is not always easy to find out which of the two is wrong. If the valve of the grid leak is too high or the valve of the condenser in this circuit too low it will be found that when the reaction is coupled up, instead of the set oscillating properly, it tends to produce popping sounds. This is a sign of an insulated grid or a wrong valve of grid leak. The usual valves that work best together in a
circuit are a .00025 fixed condenser and 2 megohm grid leak. Always buy good components (not necessarily expensive ones) and make sure of getting a condenser that is of correct capacity and of proper insulation and a grid leak that is constant and of the resistance stated. A variable grid leak can be used if desired, but a good fixed one is quite as good as the best possible obtainable and infinitely preferable to some cheap variable leaks, which are neither quiet or oonstant. In addition, of course, a fixed grid leak makes the
operation of the set far more simple since it makes one less adjustment to be considered.
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Bibliographic details
Ellesmere Guardian, Volume XLVI, Issue 3173, 2 December 1927, Page 6
Word Count
210FAULTY GRID LEAKS. Ellesmere Guardian, Volume XLVI, Issue 3173, 2 December 1927, Page 6
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