Western electric 101 j brochure

Page 1

101J

BELL SYSTEM PRACTICES SECTION AB46.030
Transmission Engineering and Data Issue 1, September 1936
Vacuum Tube Data A T & T Co Standard

Weary/~17 fleet/72

101] Vacuum Tube

Classification-Low-power filamentary triode

The 101J tube is similar in characteristics to the 101F, but is contained in a pear-shaped
bulb and has higher insulation between elements.

Applications

Modulator and demodulator in carrier systems.

Voice-frequency and carrier-frequency amplifier for telephone repeater equipment and other
applications where small power outputs are required.

Dimensions-Dimensions. outline diagrams of the tube and base. and the arrangement of the
electrode connections to the base terminals are shown in Figures 1 and 2.

Base-Four-pin, bayonet type, having special contact metal at the ends of the Contact pins.

Socket-Four-contact, bayonet~slot type, preferably provided with contact-metal contacts, such
as the Western Electric 1001. for front of panel mounting or 100R for rear of panel mounting.

Mounting Positions-Either vertical or horizontal. If mounted in a horizontal position, the
plane of the filament, which is indicated in Figure 2. should be vertical.

Copyright 1936 Western Electric Compan), Incorporated

Page 2

101.]

Average Direct Intereleetrode Capacitances

A. 1 C
Grid to plate, of . . ................. 6.5 6.1 6.2
Grid to filament, uuf. 4.2 4.9 5.3
Plate to filament. nut. 1.7 3.7 4.1

Column A\Based tube without socket.

Column B~Tube alone when measured in 100L socket mounted on metal plate; socket
and mounting plate connected to filament.

Column C\Tube alone when measured in 100R socket mounted in metal plate; socket
and mounting plate connected to filament.

Filament Rating

Filament current .. ., ... ..... .. .. .. .. .7 . 0.50ampere,d.c.
Nominal filament voltage . . . . . ..................... 4.15 volts

The filament of this tube is designed to operate on a current basis and should be operated
at a current not appreciably exceeding the rated value.

Characteristics and Operating Condifions--Plate.current characteristics of a typical 1011 tube
are shown in Figure 3 as functions of grid bias. Permissible operating grid and plate voltages are
included within the area ABCD. The grid and plate voltages are measured to the negative end of
the filament. Corresponding amplification-factor, plate-resistance. and transconductance charac-
teristics are given in Figures 4. 5, and 6, respectively. Plate-current characteristics are given as
functions of plate voltage in Figure 7.

A number of recommended and maximum operating conditions and the corresponding
values of amplification factor and plate resistance are given in the table on page 3. Recommended
conditions or others of no greater severity should be selected in preference to maximum conditions
wherever possible. The life of the tube at maximum operating conditions may be shorter than

at the recommended conditions.

Power Output and Distortion-The fundamental power output in milliwatts, and the second
and third harmonic levels in db below the fundamental, corresponding to the recommended and
maximum operating conditions, are given in the latter part of the table for values of load resist-
ance, R, both equal to and double the value of the plate resistance, rp. The peak value of the
sinusoidal input voltage, Egm, which gives the indicated power output, Pm, and harmonic levels,
Fgm and 173,, in each case, is numerically equal to the grid bias. For a smaller input voltage, Eg,
the approximate levels may be computed from the following relations:

2
12:12,, E;
E3111

F2 =F2m+2010gio§m

g

F3 =F3m+40 logic gm

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