NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

12BY7A
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9BFEIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 12DQ7
Substitutes ................................... 12GN7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as video amplifier in tv receivers. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-3
EIA Base ...................................... 9BF
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.6/0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 10.2 pf
Output ........................................ 3.5 pf
Grid to Plate ................................. 0.063 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 190 V
Plate Dissipation ............................. 6.5 W
Grid No. 2 Dissipation ........................ 1.2 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Amplification Factor .......................... 1200
Plate Resistance (approx) ..................... 90K Ω
Transconductance .............................. 12K µMho
Plate Current ................................. 25 mA
Grid No. 2 Current ............................ 6 mA

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Resistance (approx) ..................... 93K Ω
Transconductance .............................. 11K µMho
Plate Current ................................. 26 mA
Grid No. 2 Current ............................ 5.75 mA

A horizontal ribbon.

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A horizontal ribbon.

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Mon, 27 Jun 2022 11:06:01 -0700