NJ7P SQL Tube Database Query

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12HL7
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9BFEIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 12GN7
Substitutes ................................... 12HG7
Source ........................................ RCA RC-29 - 1975

Application

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

Mechanical Data

Source ........................................ RCA RC-29 - 1975
EIA Outline ................................... 6-3
EIA Base ...................................... 9BF

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 15 pf
Output ........................................ 6 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 40 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 1 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 ...................... 122 Ω
Plate Resistance (approx) ..................... 55K Ω
Transconductance .............................. 21000 µMho
Plate Current ................................. 25 mA
Grid No. 2 Current ............................ 6 mA

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Sat, 02 Jul 2022 07:09:44 -0700