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25 September 2017 


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Advance Electron Tube Data Sheet

Western Electric 437A Electron Tube

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Picture of Western Electric 437A Electron Tube
Description
The 437A electron tube is a high figure of merit triode with an indirectly heated cathode. It was designed primarily for the output amplifier of the L-3 tandem two stage amplifier.

 

Characteristics
Heater Voltage 6.3 volts
Cathode Current (Eb = 160 volts; Eccl = +7.5 volts; Rk = 262 ohms) 36.5 milliamperes
Transconductance 46000 micromhos

General Characteristics

Electrical Data
Heater Voltage 6.3 volts
Heater Current 450 milliamperes

 

Direct Interelectrode Capacitances Without External Shield With External Shield RETMA #309
Grid to Plate (maximum) 3.8 3.8 uuf
Input: g to(h+k+i.s.) 11.1 11.3 uuf
Output: p to(h+k+i.s.) 1.0 2.1 uuf

 

Mechanical Data
Cathode Coated Unipotential
Bulb T9
Base See outline diagram below
Mounting Position Any
Dimensions and pir. See outline diagram below

 

Maximum Ratings, Design Centre Values
Plate Voltage 250 volts
Plate Dissipation 7.0 watts
Control Grid Dissipation See footnote 1
Cathode Current 45 milliamperes
Heater-Carthode Voltage 50 volts
Bulb Temperature 130° centigrade

 

Maximum Circuit Values
Grid Circuit Resistance:
For Fixed Bias 0.05 megohm
For Cathode Bias 0.10 megohm

 

Typical Operating Conditions And Characteristics
Plate Voltage 140 180 160 volts
Control Grid Voltage -2.0 -3.0 --- volts
Control Grid Supply Voltage 2 --- --- +7.5 volts
Cathode Bias Resistor 2 --- --- 262 ohms
Plate Current 29.0 25.0 36.5 milliamperes
Amplification Factor 41.0 41.0 41.0
Plate Resistance 950 980 900 ohms
Transconductance 43000 42000 46000 micromhos
Control Grid Voltage (approximate) for Plate Current of 10 microamperes -5.0 -6.3 --- volts
Modulation
Second Order (2F) 3 --- --- -37 db
Third Order (3F) 4 --- --- -56 db
Load Resistance --- --- 270 ohms
Note 1: Operation with the control grid positive with respect to cathode is not recommended.
Note 2: Reference point for control grid voltage is the negative end of the cathode bias regulator.
Note 3: Ratio of product to fundamental at output for 0.1 volt rms signal from grid to cathode.
Note 4: Ratio of product to fundamental at output for 0.2 volt rms signal from grid to cathode.
4 Technical graphs showing technical statistics of Western Electric 437A Electron Tube
4 Technical graph showing technical statistics of Western Electric 437A Electron Tube
Technical diagram showing Western Electric 437A Electron Tube

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