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Tube Substitutions for:
12AX7
High Mu Duo Triode

Type	Substitutes	Base Diagram
12AX7	12AX7A, 12AX7WA, 12DF7, 12DT7, 7025, 7025A, 12AD7*, 12AU7§, 12AU7A§, 12BZ7*, 12DM7*, 5751*, 5751WA*, 6057, 6681, 7494, 7729
Notes:	* - Parallel filaments
Web References	12AX7 (General Electric) @ Franks Electron Tubes 12AX7 (Tung-Sol) @ Franks Electron Tubes 12AX7 (Sylvania) @ Franks Electron Tubes 12AX7 (Brimar) @ Franks Electron Tubes 12AX7 (Brimar) @ Franks Electron Tubes 12AX7 @ RadioMuseum.org

Sylvania Type 12AX7
HIGH-MU DUOTRIODE


MECHANICAL DATA

Bulb	T-61/2
Base	Small Button 9-Pin
Basing	9A
Mounting Position	Any

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage Series/Parallel	12.6/6.3	Volts
Heater Current	150/300	Ma
Maximum Peak Heater-Cathode Voltage	200	Volts

DIRECT INTERELECTRODE CAPACITIES¹

	Shielded2	Unshielded	Shielded2	Unshielded
Grid to Plate	1.7	1.7	1.7	1.7	��f
Input	1.8	1.6	1.8	1.6	��f
Output	1.9	0.46	1.9	0.34	��f

MAXIMUM RATINGS (Design Center Values) Each Section
CLASS A₁ AMPLIFIER (Each Section)

Plate Voltage	300	Volts
Plate Dissipation	1.0	Watts
Positive D C Grid Voltage	0	Volts
Negative D C Grid Voltage	50	Volts

CHARACTERISTICS AND TYPICAL OPERATION
CLASS A₁ AMPLIFIER (Each Section)

Plate Voltage	100	250	Volts
Grid Voltage	-1	-2	Volts
Plate Current	0.5	1.2	Ma
Transconductance	1250	1600	�mhos
Amplification Factor	100	100	X

NOTES:

1	Section No. 1 connects to Pins 6, 7 and 8. Section No. 2 connects to Pins 1, 2 and 3.
2	External shield No. 315 connected to cathode of section under test.

APPLICATION
The Sylvania type 12AX7 is a miniature, hugh-mu triode having seperate cathodes. It is designed for service as an audio voltage amplifer or phase inverter in portable or compact equipment.


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