Home  Resources  References  Tubes  Forums  Links  Support  Sale 

Tube Substitutions for:
12AT7
Duo Triode
TypeSubstitutesBase Diagram
12AT712AZ7*, 12FV7, 12AT7WA, 12AT7WB, 6060, 6201, 6671, 6679, 7492, 7728, A2900, 12AZ7A*
Notes:* - Parallel filaments
Web References12AT7 (Mazda-Belvu) @ Franks Electron Tubes
12AT7 (RCA (HB3)) @ Franks Electron Tubes
12AT7 (General Electric) @ Franks Electron Tubes
12AT7 (Tung-Sol) @ Franks Electron Tubes
12AT7 (Brimar) @ Franks Electron Tubes
12AT7 (Brimar) @ Franks Electron Tubes
12AT7 (RCA (RC30)) @ Franks Electron Tubes
12AT7 (RCA (RC30)) @ Franks Electron Tubes
12AT7 @ RadioMuseum.org
Sylvania Type 12AT7
DUO TRIODE



MECHANICAL DATA

Bulb T-6�
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 Series/Parallel 150/300 Ma
Maximum Heater-Cathode Voltage 90 Volts

DIRECT INTERELCTRODE CAPACITANCES (Unshielded)
Grid to Plate 1.5 1.5 ��f
Input 2.2 2.2 ��f
Output 0.5 0.4 ��f
Grid to Grid .005 .005 ��f
Plate to Plate 0.4 0.4 ��f
Heater to Cathode 2.4 2.4 ��f
Grounded Grid Operation
Plate to Cathode 0.2 0.2 ��f
Input 4.6 4.6 ��f
Output 1.8 1.8 ��f

MAXIMUM RATINGS (Design Center - Each Section)
Plate Voltage 300 Volts
Plate Dissipation 2.5 Watts

TYPICAL OPERATION
Class A1 Amplifer - Each Section
Plate Voltage 100 180 250 Volts
Grid Voltage -1 -1 -2 Volts
Cathode Bias Resistor 270 90 200 Ohms
Plate Current 3.7 11.0 10.0 Ma
Plate Resistance 15000 9400 10900 Ohms
Transconductance 4000 6000 5500 �mhos
Amplification Factor 60 62 60 X
Grid Voltage for Ib=10�a -5 -8 -12 Volts


© 1996-2021 Nostalgia Air