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6BQ5
Power Amplifier Pentode

EIA Base & Outline

EIA Base: 9CVEIA Bulb: 6-4

Substitute Data

Substitutes ................................... 7189
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in the output stage of audio-frequency amplifiers. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 6-4
EIA Base ...................................... 9CV
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.76 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 100 V
Heater Negative with Respect to Cathode
Total DC and Peak ....................... 100 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 10.8 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.5 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Input ................................... 0 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 2 W
Cathode Current ............................... 65 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.3M Ω
Self Bias .................................. 1M Ω

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 ............................ -7.3 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 135 Ω
Peak Grid No. 1 Voltage........................ 6.1 V
Plate Resistance (approx) ..................... 38K Ω
Transconductance .............................. 11.3K µMho
Plate Current (Zero Signal) ................... 48 mA
Plate Current (Maximum Signal) ................ 50.6 mA
Grid No. 2 Current (Zero Signal) .............. 5.5 mA
Grid No. 2 Current (Maximum Signal) ........... 10 mA
Load Resistance ............................... 4.5K Ω
Power Output (approx) ......................... 5.7 W
Total Harmonic Distortion ..................... 10 %

Class A Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -7.3 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 135 Ω
Peak Grid No. 1 Voltage........................ 6.2 V
Plate Resistance (approx) ..................... 38K Ω
Transconductance .............................. 11.3K µMho
Plate Current (Zero Signal) ................... 48 mA
Plate Current (Maximum Signal) ................ 50.6 mA
Grid No. 2 Current (Zero Signal) .............. 5.5 mA
Grid No. 2 Current (Maximum Signal) ........... 10 mA
Load Resistance ............................... 5.2K Ω
Power Output (approx) ......................... 5.7 W
Total Harmonic Distortion ..................... 10 %

Class A Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -8.4 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 210 Ω
Peak Grid No. 1 Voltage........................ 4.95 V
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 10K µMho
Plate Current (Zero Signal) ................... 36 mA
Plate Current (Maximum Signal) ................ 36.8 mA
Grid No. 2 Current (Zero Signal) .............. 4.1 mA
Grid No. 2 Current (Maximum Signal) ........... 8.5 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 4.2 W
Total Harmonic Distortion ..................... 10 %

Class A Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 210 V
Grid No. 1 Voltage ............................ -6.4 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 160 Ω
Peak Grid No. 1 Voltage........................ 4.8 V
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 10400 µMho
Plate Current (Zero Signal) ................... 36 mA
Plate Current (Maximum Signal) ................ 36.6 mA
Grid No. 2 Current (Zero Signal) .............. 3.9 mA
Grid No. 2 Current (Maximum Signal) ........... 7.3 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 4.3 W
Total Harmonic Distortion ..................... 10 %

Push Pull Class B Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -11.6 V
Peak Grid No. 1 Voltage........................ 22.6 V
Plate Current (Zero Signal) ................... 20 mA
Plate Current (Maximum Signal) ................ 75.0 mA
Grid No. 2 Current (Zero Signal) .............. 2.2 mA
Grid No. 2 Current (Maximum Signal) ........... 15.0 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 11 W
Total Harmonic Distortion ..................... 3 %

Push Pull Class B Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -14.7 V
Peak Grid No. 1 Voltage........................ 28.2 V
Plate Current (Zero Signal) ................... 15.0 mA
Plate Current (Maximum Signal) ................ 92.0 mA
Grid No. 2 Current (Zero Signal) .............. 1.6 mA
Grid No. 2 Current (Maximum Signal) ........... 22 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 17 W
Total Harmonic Distortion ..................... 4 %

Push Pull Class AB1 Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 130 Ω
Peak Grid No. 1 Voltage........................ 22.6 V
Plate Current (Zero Signal) ................... 62 mA
Plate Current (Maximum Signal) ................ 75 mA
Grid No. 2 Current (Zero Signal) .............. 7 mA
Grid No. 2 Current (Maximum Signal) ........... 15 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 11 W
Total Harmonic Distortion ..................... 3 %

Push Pull Class AB1 Amplifier [TS}
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 130 Ω
Peak Grid No. 1 Voltage........................ 28.2 V
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 92 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 22 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 17 W
Total Harmonic Distortion ..................... 4 %

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -7.3 V
Plate Resistance (approx) ..................... 38K Ω
Plate Current ................................. 49.5 mA
Grid No. 2 Current ............................ 10.8 mA
Load Resistance ............................... 5.2K Ω
Power Output (approx) ......................... 17 W

Triode Class A Amplifier [TS]
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Peak Grid No. 1 Voltage........................ 9.5 V
Plate Current (Zero Signal) ................... 34 mA
Plate Current (Maximum Signal) ................ 36 mA
Load Resistance ............................... 3.5K Ω
Power Output (approx) ......................... 1.95 W
Maximum Frequency ............................. MHz
Total Harmonic Distortion ..................... 9 %

Triode Push Pull Class A Amplifier [TS]
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Peak Grid No. 1 Voltage........................ 23.4 V
Plate Current (Zero Signal) ................... 40 mA
Plate Current (Maximum Signal) ................ 43.4 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 3.4 W
Maximum Frequency ............................. MHz
Total Harmonic Distortion ..................... 2.5 %

Triode Push Pull Class A Amplifier [TS]
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Peak Grid No. 1 Voltage........................ 28.2 V
Plate Current (Zero Signal) ................... 48 mA
Plate Current (Maximum Signal) ................ 52 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 5.2 W
Maximum Frequency ............................. MHz
Total Harmonic Distortion ..................... 2.5 %

Notes

Source ........................................ RCA RC-29 - 1975
1. Grid 2 connected to plate for triode connection.

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