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12AB5
Beam Power Amplifier

EIA Base & Outline

EIA Base: 9EUEIA Bulb: 6-3

Substitute Data

Substitutes ................................... 7061
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in the output stage of automobile radio receivers operating from a 12-volt storage battery. 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 ...................................... 9EU
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 12.6 V
Heater Current ................................ 0.2 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 8 pf
Output ........................................ 8.5 pf
Grid to Plate ................................. 0.7 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 285 V
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 2 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -12.5 V
Peak Grid No. 1 Voltage........................ 12.5 V
Amplification Factor .......................... 45
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 4100 µMho
Plate Current (Zero Signal) ................... 45 mA
Plate Current (Maximum Signal) ................ 47 mA
Grid No. 2 Current (Zero Signal) .............. 4.5 mA
Grid No. 2 Current (Maximum Signal) ........... 7 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 4.5 W

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Peak Grid No. 1 Voltage........................ 10.5 V
Plate Resistance (approx) ..................... 75K Ω
Transconductance .............................. 4000 µMho
Plate Current (Zero Signal) ................... 33.5 mA
Plate Current (Maximum Signal) ................ 36 mA
Grid No. 2 Current (Zero Signal) .............. 1.6 mA
Grid No. 2 Current (Maximum Signal) ........... 3.2 mA
Load Resistance ............................... 6K Ω
Power Output (approx) ......................... 3.3 W

Push Pull Class AB1 Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 30 V
Amplification Factor .......................... 70
Plate Resistance (approx) ..................... 60K Ω
Transconductance .............................. 3750 µMho
Plate Current (Zero Signal) ................... 70 mA
Plate Current (Maximum Signal) ................ 79 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 10 W

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