Western electric 417 a brochure

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BELL SYSTEM PRACTICES SECTION AB46.417A
Transmission Engineering Data Issue 3, September 1962
Electron Tube Data A.T.& T. Co. Standard

. ELECTRON TUBE DATA SHEET
WESTERN ELECTRlC 4|7A ELECTRON TUBE

DESCRIPTION

The 417A is a 9-pin miniature triode with an indirectly heated cathode. It is
intended primarily for grounded-grid operation in the input stage of broad band

amplifiers.

CHARACTERISTICS

Heater Voltage . . . . . . . . . . . . . . . . . . . . . . . . 6.3 volts
Maximum Plate voltage . . . . . . . . . . . . . . . . . . . . . 200 volts
Amplification Factor . . . . . . . . . . . . . . . . . . . . . 43

FILE: MINIATURE SECTION

(:> American Telephone and Telegraph company 1962

4I7A

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4|? A-PAGE 2

GENERAL CHARACTERISTICS

Electrical Data

Heater Voltage (Note 1).

Heater Current

Direct Interelectrode Capacitances
Input (cathode to grid and heater)-
Output (plate to grid and heater)
Plate to Cathode and Heater-

Mechanical Data

Cathode.

Bulb.

Base . . . . . .
Mounting Position

MAXIMUM RATINGS, Absolute System (Note 2)

Plate Voltage.

Plate Dissipation
Cathode Current- - -
Heater Cathode Voltage-
Bulb Temperature

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS

Plate supply voltage.
Grid Voltage (Note 3)
Cathode Resistor
Plate Current

Plate Resistance
Transconductance
Amplification Factor-

Note 1: For optimum tube life the heater voltage specified (6. 3 volts) should be regulated to+ 3%

6.3 volts
300 milliamperes
.(without external shield)

9.0 uuf
1.8 uuf
0.48 uflf

. coated unipotential

. T 6%

Small button 9 pin
. . . . Any
200 volts
4.5 watts
40 milliamperes
55 volts

130° centigrade

130 150 volts
- +7.5 - volts
360 62 ohms

- 23.0 22.5 milliamperes
- 1850 1700 ohms
-25000 25000

micromhos
44 43

Note 2: 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 3: Reference point for Grid Voltage is the negative end of the cathode resistor. Operation
with the control grid positive with respect to the cathode is not recommended.