NJ7P SQL Tube Database Query

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12FX5
Power Pentode

EIA Base & Outline

EIA Base: 7CV

Substitute Data

Preferred Substitutes ......................... 12ED5 12EH5
Substitutes ................................... 12DM5 12CA5 12AS5
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in output stages of audio amplifiers. Requires miniature 7-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
EIA Base ...................................... 7CV

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 12.6 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 17 pf
Output ........................................ 9 pf
Grid to Plate ................................. 0.65 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 2 Voltage ............................ 130 V
Plate Dissipation ............................. 5.5 W
Grid No. 2 Dissipation ........................ 2 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 110 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 62 Ω
Peak Grid No. 1 Voltage........................ 3 V
Plate Resistance (approx) ..................... 17.5K Ω
Transconductance .............................. 13500 µMho
Plate Current (Zero Signal) ................... 36 mA
Plate Current (Maximum Signal) ................ 35 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 12 mA
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 1.3 W

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Tue, 29 Nov 2022 21:18:53 -0700