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Tube Substitutions for:
6BK7B
Medium Mu Twin Triode RF Amplifier
TypeSubstitutesBase Diagram
6BK7B6CX7, 6AQ8, 6BC8*, 6BQ7*, 6BZ7*, 6CH7, X155*, 6BK7A, 6BK7, 6BQ7A*, 6BS8*, 6BX8*, 6HK8*, 6BZ8*, 6FW8, 6KN8Tube Base 9AJ
Notes:* - Parallel filaments
RCA Type 6BK7B
MEDIUM-MU TWIN TRIODE
MECHANICAL DATA
BulbT-61/2
BaseMiniature Button 9-Pin
Basing9AJ
Mounting PositionAny
ELECTRICAL DATA
HEATER CHARACTERISTICS
Heater Voltage (AC/DC)6.3Volts
Heater Current450Ma
Heater Warm-Up Time (Avg)11Seconds
DIRECT INTERELECTRODE CAPACITIES
Grid to Plate1.81.8µµf
Grid to Cathode, Heater, and Internal Shield33µµf
Plate to Cathode, Heater, and Internal Shield10.9µµf
Cathode to Grid, Heater, and Internal Shield66µµf
Plate to Grid, Heater, and Internal Shield2.42.4µµf
Plate to Cathode0.220.22µµf
Heater to Cathode2.83µµf
Grid of Unit 1 to Grid of Unit 2-0.004max µµf
Plate of Unit 1 to Plate of Unit 2-0.075max µµf
MAXIMUM RATINGS (Design Center Values -- Except as Noted)
CLASS A1 AMPLIFIER (Each Unit)
Plate Voltage300Volts
Grid Voltage, Negative-Bias value-50Volts
Plate Dissipation2.7Watts
Peak Heater-Cathode Voltage (neg to cathode) 2001Volts
Peak Heater-Cathode Voltage (pos to cathode) 2002Volts
CHARACTERISTICS
Plate Supply Voltage150Volts
Cathode-Bias Resistor56Ohms
Amplification Factor43X
Plate Resistance4600Ohms
Transconductance9300µmhos
Plate Current18Ma
Grid Voltage for Plate Current of 10 µa-11Volts
NOTES:
1In cathode-drive circuits with direct-coupled drive, it is permissible for this voltage to be as high as 300 volts under cutoff conditions.
2The dc component must not exceed 100 volts.
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