Voltage - Triode (single) ·Triode
General-purpose receiving triode for voltage amplification, detection, oscillator, or Class-A service as documented by the manufacturer.
Western Electric general-purpose triode with a 10.0 V, 0.32 A heater-type cathode and a published Class-A operating point.
Medium 4-contact bayonet base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
262B/347A shared electrical characteristics. Representative point: 120 V plate, -4.5 V grid, 2.1 mA. Maximum operating points extend to 180 V.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater Voltage
10 V
Heater Current
320 mA
Maximum Plate Voltage
200 V
Maximum Heater-Cathode Voltage
30 V
Plate Voltage
135 V
ClassA
Plate Current
2.8 mA
ClassA
Power Output
0.035 W
ClassA
Amplification Factor
15.7
ClassA
Transconductance
900 µS
ClassA
Plate Resistance
17500 ohm
ClassA
Data set 02
Published operating points and test conditions from this source.
Grid To Plate Capacitance
1.9 pF
Grid To Cathode And Heater Capacitance
2.3 pF
Plate To Cathode And Heater Capacitance
4.1 pF
Maximum Heater Cathode Voltage
30 V
Plate Current
2.1 mA
PlateVoltage=120V;GridBias=-4.5V
HumOutputLevel
-116 dB re 1mA
PlateVoltage=135V;GridBias=-4.5V;Load=15kohm;SupplyFrequency
MicrophonicNoiseOutput
-54 dB re 1V
PlateVoltage=135V;GridBias=-4.5V;Load=100kohm
Data set 03
Published operating points and test conditions from this source.
Typical plate current
2.8 mA
PlateVoltage=180V;GridVoltage=-7.5V
Microphonic noise mean level
-54 dB
PlateVoltage=135V;GridBias=-4.5V;LoadResistance=100000ohm