Western electric 436 a brochure

Page 1

BELL SYSTEM PRACTICES AB46.436A
Transmission Engineering and Data Issue 2, May 1963
Electron Tube Data A.T.& T. Co. Standard

. ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 436A ELECTRON TUBE

DESCRIPTION
The 436A electron tube is a high figure of merit tetrode with an indirectly
heated cathode. It was designed primarily for use in the L-3 amplifier. <_
CHARACTERISTICS
. Heater Voltage ' - - - - - - - - ' - ~ - - - - 6.3 volts
Cathode Current Eb = 190 volts; E62 = 160 volts] ' ' ' 28.4 milliamperes <-
Transconductance Eccl = +7.5 volts; RR = 315 ohms ' 30000 micromhos

Note 1: In the "Absolute System the maximum ratings specified are limiting values above which the
serviceability of the device may be impaired from the viewpoint of life and satisfactory
performance Maximum ratings, as such, do not constitute a set of operating conditions and

. all values may not. therefore, be attained simultaneously.

Note 2: Reference point for Control Grid voltage is the negative end of the cathode bias resistor.
. File: General Purpose Section Indicates a change+_

© American Telephone and Telegraph Company 1963 436 A

Page 2

436A-PAGE 2
GENERAL CHARACTERISTICS

Electrical Data

Heater Voltage . - . . - . - - - - . - - - - . - - - - 6.3 volts
Heater Current . . . . . . . . . . . . . . 450 milliamperes
Direct Interelectrode Capacitances . . . . . . . Without With External
External Shield
Shield (JEDEC #309)
I->Grid to Plate (maximum) . . . . . . . . . . . .07 .06 [J/Jf
Input: g1 to (h+k+g2+i.s.) . . . . . . . . . . 14.0 14.2 uuf
L» Output: p to (h+k+g2+i.s.) - - . - - - . - . - 3.5 4.7 unf
Mechanical Data
Cathode . . . . . - . - . . . - - - - . . - - - - . . Coated Unipotential
Bulb ---T9
Base . . . . . . . . . . . . . . . . . n . See outline drawing page 4
Mounting Position . . . . . . . . .Any

Dimensions and pin connections shown in outline drawing on page 4.

| MAXIMUM RATINGS, Absolute System (Note 1. See Page 1)

Plate Voltage. . . . . . . . . . . . . . . . . . . . . . 210 volts
Screen Grid Voltage . . . . - - - - - - - . . - - - . - - 1'75 volts
Plate Dissipation . . . . . . . . . . . . . . . . . . . . 5,0 watts
Screen Grid Dissipation. . . . . . . . . . . . . . . . . . 2.2 watts
Control Grid Dissipation . . . . . . . . . . . . . . . . . See footnote *
Cathode Current . . . . . . . . . . . . . . . . . . . . 50 milliamperes
Heater- Cathode Voltage . . . . . . . . . . . . . . . . . . 55 volts
L>Bu1b Temperature . . . . . . . . . . . . . . . . . . . . 130 centigrade
Maximum Grid Circuit Resistance for
Fixed Bias . . . . . . . . . . . . . . . . . . . . . .0.05 megohm
Cathode Bias. . . . . . . . . . . . . . . . . . . . . .o_1o megohm

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS

Plate Voltage. . . . . . . . . . . . . . . . 130 160 190 volts
Screen Grid Voltage . . - . - . . - - . . - - 130 160 160 volts
Control Grid Voltage - - - . -1.0 -1.75 - volts
Control Grid Supply Voltage (Note 2 See Page 1) - - - - +7.5 volts
Cathode Bias Resistor (Note 2, See Page 1) . . . . - - 315 ohms
->-Plate Current. . . . . . . . . . . . . . . . 21.5 18.8 20.2 milliamperes
Screen Grid Current . . . . . . . . . . . . . 12,5 10,3 8.2 milliamperes
Plate Resistance. . . . . . . . . . . . . . . 5000 5000 36000 ohms
Transconductance . . . . . . .30000 28000 30000 micromhos
Control Grid Voltage (approximate) for
Plate Current of 10 microamperes . . . . . . . -3.7 -4.7 - volts
Modulation
Second Order (2F)** . . . . . . . . . . . . . - - -32 db
Third Order (3F)"* . - - - - - - - - . - - - - - -54 db
Load Resistance . . . . . . . . . . . . . . - - 270 ohms

Operation with the control grid msitive with respect to cathode is not recommended.

Ratio of product to fundamental at output for 0.1 volt rms signal from grid to cathode.
* Ratio of product to fundamental at output for a 0.2 volt rms signal from grid to cathode.
--> Indicates a change