NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

8BQ11
Semiremote-Cutoff Dual Pentode

EIA Base & Outline

EIA Base: 12DMEIA Bulb: 9-58

Substitute Data

Preferred Substitutes ......................... 8AR11
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Duodecar type used as if amplifier in tv receivers. Requires duodecar 12-contacts socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
EIA Outline ................................... 9-58
EIA Base ...................................... 12DM

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 8.4 V
Heater Current ................................ 0.6 A

Direct Interelectrode Capacitances (approx)

Pentode 1
Source ........................................ RCA RC-29 - 1975
Input ......................................... 10 pf
Output ........................................ 2.8 pf
Grid to Plate ................................. 0.022 pf

Pentode 2
Source ........................................ RCA RC-29 - 1975
Input ......................................... 11 pf
Output ........................................ 2.8 pf
Grid to Plate ................................. 0.028 pf

Maximum Ratings (Design Center Values)

Pentode 1
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.1 W
Grid No. 2 Dissipation ........................ 0.65 W

Pentode 2
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.1 W
Grid No. 2 Dissipation ........................ 0.65 W

Characteristics and Typical Operation

Pentode 1 Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Plate Resistance (approx) ..................... 200K Ω
Transconductance .............................. 10500 µMho
Plate Current ................................. 11 mA
Grid No. 2 Current ............................ 3.5 mA

Pentode 2 Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Plate Resistance (approx) ..................... 200K Ω
Transconductance .............................. 13000 µMho
Plate Current ................................. 11 mA
Grid No. 2 Current ............................ 3.8 mA

A horizontal ribbon.

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A horizontal ribbon.

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Thu, 18 Aug 2022 16:53:54 -0700