Western electric 262 b brochure
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Page 1
BEll. SYSTEM PRACTICES SECTION AB46.262|§
TRANSMISSION ENGINEERING AND DATA ISSUE 1, APRIL 1948
ELECTRON TUBE DATA A.T.&T. CO. STANDARD
TRIODE
AUDIO-FREQUENCY AMPLIFIER Wafer EleCITIC
DESCRIPTION
The 2628 is a triode designed for use as an audio-frequency amplifier Where exception-
ally low tube noise is required. Special design features minimize both the microphonic
noise and the hum produced by a.c. operation of the heater.
CHARACTERISTICS
Heater Voltage 10 volts
Maximum Plate Voltage i . i . 180 volts
Amplification Factor . . . . 15
ELECTRON TUBE DATA SHEET
F133: GENERAL PURPOSE SECTION
11 7
Page 2
262B - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C
Heater Current
10 volts
320 milliamperes
Direct Interelectrode Capacitances (without external shield)
Grid to Plate
Input
Output
MECHANICAL DATA
Cathode
Bulb
Bae
Mounting Position
1.9 uuf
2.4 uuf
3.8 uuf
Coated Unipotential
ST 12
Small 4-pin
Any
Dimensions and pin connections shown in outline drawing on
Page 3
MAXIMUM RATINGS, Design-Center Values
Plate Voltage
Plate Dissipation
Plate Current
Heater-Cathode Voltage
180 volts
2.0 watts
10.0 milliampetes
30 volts
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS-CLASS A1 AMPLIFIER
Plate Voltage 120
Grid Voltage -6.0
Peak A-F Grid Voltage 6.0
Plate Current 1.0
Transconductance 560
14.8
Amplification Factor
Plate Resistance 26600
Load Resistance 100000
Maximum Signal Power Output 24
Total Harmonic Distortion 4
HUM
Under typical operating conditions, and with
the cathode of the tube connected to the mid-
point of the heater circuit. the equivalent
hum voltage in the grid circuit will be less
than 12 microvolrs at the supply frequency
and less than 5.0 microvolrs at double the
155 160 180 volts
74.5 *6.0 77.5 volts
4.5 6.0 7.5 volts
3.0 3.0 . 2.8 milliamperes
890 880 840 micromhos
1 5.4 1 5.5 15.3
17300 17700 18300 Ohms
100000 100000 100000 Ohms
18 31 48 milliwatfs
2.5 3 3 percent
supply frequency.
If the insulation leakage and capacitance be-
tween the external grid and heater connec-
tions are kept reasonably low. a resistance of
2 megohms may be used in the grid circuit
without materially affecting the bum level.