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8BU11
Medium-Mu twin Triode - Sharp-Cutoff Pentode

Base & Bulb ( RCA RC-29 - 1975)

Application

Duodecar type used in tv receiver applications. Requires duodecar 12-contact socket.

Mechanical Data

Outline ....................................... 9-59
EIA Base ...................................... 12FP

Electrical Data

Heater Voltage ................................ 7.8 V
Heater Current ................................ 0.6 A

Maximum Ratings (Design Center Values)

Each Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.8 W

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 2.5 W
Grid No. 2 Dissipation ........................ 0.55 W

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 68 Ω
Amplification Factor .......................... 43
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 8600 µ
Plate Current ................................. 13.5 mA

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 200K Ω
Transconductance .............................. 7500 µ
Plate Current ................................. 12 mA
Grid No. 2 Current ............................ 4 mA

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