Show Tube Insurance THat Is Worth Remembering Probably many tubes are burned out outI ever every year by accidentally connecting I a voltage high-voltage B battery across their filament terminals There are many ways to prevent such an from happening and one of the time easIest Is to connect a high resistance In the negative lead to the B n battery hattery An ordinary watt 0 light electric bulb Is Isone isone laone one high resistance which ma may be used for this tills purpose If the use of the lamp causes cause a II howling hO noise to tobe tobe tobe be heard shunt It with a 1 con con- condenser denser deuser |