Show life of radio tube Is governed by use it gets gels the life of any radio tube Is governed by the use it receives in the hands of the operator and its existence may be terminated either by the filament burning out or a decrease dec rense in the electronic life of the he tube now the burning out of a tube may be b caused by excessive filament current or by a short circuit with the lie B battery or it may naturally burn of its own accord the decrease in electronic emission in a tube Is caused by excessive filament voltage or excessive B battery voltage the majority or of operators opera tora of receiving sets ena can prolong the life of their tubes by burning the filaments as aa low as possible and by keeping beeping the a battery to 00 90 volts or less |