NJ7P SQL Tube Database Query

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12BH7A
Medium-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 12DW7
Substitutes ................................... 12AU7 12AZ7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as combined vertical-deflection amplifier and oscillator, and as horizontal-deflection oscillator in tv receivers and in phase-inverter and multivibrator circuits. 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 ...................................... 9A
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)

Triode 1
Source ........................................ RCA RC-29 - 1975
Input ......................................... 3.2 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 2.6 pf

Triode 2
Source ........................................ RCA RC-29 - 1975
Input ......................................... 3.2 pf
Output ........................................ 0.5 pf
Grid to Plate ................................. 2.6 pf

Maximum Ratings (Design Center Values)

Triode 1
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 3.5 W

Triode 2
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 3.5 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -10.5 V
Amplification Factor .......................... 16.5
Plate Resistance (approx) ..................... 5.3K Ω
Transconductance .............................. 3100 µ
Plate Current ................................. 11.5 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Thu, 02 Feb 2023 11:05:17 -0700