Home  Resources  References  Tubes  Forums  Links  Support 

Tube Substitutions for:
6AK5
HF Sharp Cutoff Pentode

Type	Substitutes	Base Diagram
6AK5	5591*, 5654, 6AG5*, 6BC5*, 6CE5*, 6AK5W, 6AK5WA, 6AK5WB, 6CY5*§, 6EA5*§, 6EV5*§, 403A, 1220, 6096, 6968, EF95
Notes:	* - Parallel filaments § - May not work in all circuits
Web References	6AK5 (Mazda-Belvu) @ Franks Electron Tubes 6AK5 (RCA (HB3)) @ Franks Electron Tubes 6AK5 (Tung-Sol) @ Franks Electron Tubes 6AK5 (RCA (RC30)) @ Franks Electron Tubes 6AK5 @ RadioMuseum.org

SYLVANIA Type 6AK5
HIGH FREQUENCY PENTODE

Bulb	T-5�
Base	Miniature Button 7-Pin
Basing	7BD
Mounting Position	Any

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage	6.3	Volts
Heater Current	175	Ma
Maximum Heater-Cathode Voltage	120	Volts

DIRECT INTERELECTRODE CAPACITIES

Grid to Plate	0.021	.03	��f
Input	4.01	4.0	��f
Output	2.81	2.1	��f

MAXIMUM RATINGS (Design Center Values -- Except as Noted)

Plate Voltage	180	Volts
Plate Dissipation	1.7	Watts
Grid No. 2 Voltage	*	See Rating Chart
Grid No. 2 Dissipation	0.5	Watts
Grid No. 2 Supply Voltage	180	Volts
Positive Grid No. 1 Voltage	0	Volts
Cathode Current	18 Ma

TYPICAL OPERATION
Class A₁ Amplifer

Plate Voltage	120	180	Volts
Grid No. 2 Voltage	120	120	Volts
Cathode Bias Resistor2	180	180	Ohms
Plate Current	7.5	7.7	Ma
Grid No. 2 Current	2.5	2.4	Ma
Transconductance	5000	5100	�mhos
Plate Resistance (approx.)	0.30	0.50	Megohms

NOTES:

1	Shield No. 316 connected to cathode.
2	Fixed bias operation is not recommended

APPLICATION
Sylvania Type 6AK5 is a miniature sharp cutoff r f pentode capable of operation up to 400 mc. The dual cathode leads, when properly used help isolate input and output circuits, thereby permitting greater gain per stage.

AVERAGE PLATE CHARACTERISTICS


RATING CHART



© 1989-2025 Nostalgia Air