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Tube Substitutions for:
6BK7B
Medium Mu Twin Triode RF Amplifier

Type	Substitutes	Base Diagram
6BK7B	6FW8, 6KN8, 6AQ8, 6BC8*, 6BQ7*, 6BZ7*, 6BZ8*, 6CH7, 6CX7, 6BK7A, 6BK7, 6BQ7A*, 6BS8*, 6BX8*, 6HK8*, X155*
Notes:	* - Parallel filaments
Web References	6BK7B (RCA (HB3)) @ Franks Electron Tubes 6BK7B (General Electric) @ Franks Electron Tubes 6BK7B (Tung-Sol) @ Franks Electron Tubes 6BK7B (RCA (RC30)) @ Franks Electron Tubes 6BK7B @ RadioMuseum.org

RCA Type 6BK7-B
MEDIUM-MU TWIN TRIODE


MECHANICAL DATA

Bulb	T-61/2
Base	Miniature Button 9-Pin
Basing	9AJ
Mounting Position	Any

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage (AC/DC)	6.3	Volts
Heater Current	450	Ma
Heater Warm-Up Time (Avg)	11	Seconds

DIRECT INTERELECTRODE CAPACITIES

Grid to Plate	1.8	1.8	��f
Grid to Cathode, Heater, and Internal Shield	3	3	��f
Plate to Cathode, Heater, and Internal Shield	1	0.9	��f
Cathode to Grid, Heater, and Internal Shield	6	6	��f
Plate to Grid, Heater, and Internal Shield	2.4	2.4	��f
Plate to Cathode	0.22	0.22	��f
Heater to Cathode	2.8	3	��f
Grid of Unit 1 to Grid of Unit 2	-	0.004	max ��f
Plate of Unit 1 to Plate of Unit 2	-	0.075	max ��f

MAXIMUM RATINGS (Design Center Values -- Except as Noted)
CLASS A₁ AMPLIFIER (Each Unit)

Plate Voltage	300	Volts
Grid Voltage, Negative-Bias value	-50	Volts
Plate Dissipation	2.7	Watts
Peak Heater-Cathode Voltage (neg to cathode)	2001	Volts
Peak Heater-Cathode Voltage (pos to cathode)	2002	Volts

CHARACTERISTICS

Plate Supply Voltage	150	Volts
Cathode-Bias Resistor	56	Ohms
Amplification Factor	43	X
Plate Resistance	4600	Ohms
Transconductance	9300	�mhos
Plate Current	18	Ma
Grid Voltage for Plate Current of 10 �a	-11	Volts

NOTES:

1	In cathode-drive circuits with direct-coupled drive, it is permissible for this voltage to be as high as 300 volts under cutoff conditions.
2	The dc component must not exceed 100 volts.

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