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958A
Medium-Mu Triode

Base & Bulb ( GE - 1973)

Mechanical Data

Outline ....................................... 4-1
EIA Base ...................................... 5BD

Electrical Data

Filament Voltage .............................. 1.25 DC V
Filament Current .............................. 0.1 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 0.6 pf
Output ........................................ 0.8 pf
Grid to Plate ................................. 2.6 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 135 V
Plate Dissipation ............................. 0.6 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -7.5 V
Amplification Factor .......................... 12
Plate Resistance (approx) ..................... 10K Ω
Transconductance .............................. 1200 µ
Plate Current ................................. 3.0 mA

Characteristics and Typical Operation

Class C Oscillator/Amplifier
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Current ............................ 1 mA
Plate Current ................................. 7 mA
Driving Power ................................. 0.035 W
Power Output (approx) ......................... 0.6 W

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