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values of serIes plate-circuit resistance. The regIon of permissible oper­ ation is bounded by the lines representing plate dissipation = 1.5 watts, plate voltage = 135 volts, and plate current = 15 milliamperes. In class

Al amplifier service, because no grid current flows, the plate current rating

IS equivalent to the cathode current rating.

To determine the required minimum series plate-circuit resistance for a given set of o~rating conditions:

1.From Fig.2, Average Plate Characteristics, select the desired oper­ ating conditions.

2.From Fig.l determine the corresponding maximum plate dissipation and required minimum value of series plate-circuit resistance.

Example: (a) From Fig.2 - for a plate voltage of 130 volts and a grid voltage of -1 volt, the corresponding plate current is 10.5 milliamperes.

(b)From Fig.l - the plate dissipation for a plate voltage of 130 volts and a plate current of 10.5 milliamperes is approximately 1. 37

•watts. The required minimum series plate-circuit resistance for this plate

dissipation is 3700 ohms.<.' .Et =6.3 VOLTS

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Fig.2 - Average Plate Characteristics for Type 6Clf4 and for Types 2Clf4 and 13Clf4 Except for Heater Voltage.

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