Western electric 205 f brochure
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Extracted text from western electric 205 f brochure (Ocr-read)
Page 2
205F - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Filament Voltage, A-C or D-C ,
Filament Current
Direct Interelectrode Capacitances
Grid to Plate .
Input
Output
MECHANICAL DATA
Cathode
Base
Mounting Position
45 volts
1.6 amperes
5.9 not
4.1 nut
22 uuf
. . . . . Coated Filament
Medium 4-pin, bayonet type with bayonet
pin offset
Preferably vertical; if horizontal, pins #1 and
#2 must lie in same vertical plane
Dimensions and pin connections shown in outline drawing on Page 5
MAXIMUM RATINGS, Design-Center Values
Plate Voltage .
Plate Current .
Plate Dissipation .
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
Filament Voltage, A-C
Plate Voltage . .
Grid \v'oltageE . . . .
Peak A-F Signal Voltage .
Zero Signal Plate Current
Maximum Signal Plate Current ,
Transconductance
Plate Resistance
Load Resistance
Amplification Factor . . .
Maximum Signal Power Output 1
Total Harmonic Distortion
360 volts
50 milliamperes
12.5 watts
4.5 4.5 4.5 4.5 volts
250 300 350 350 volts
-22 -18 -22.5 -225 volts
22 18 22.5 2.5 volts
11.5 30 35 35 milliamperes
12 30.5 36 36 milliamperes
1350 1880 1950 1950 micromhos
5300 3800 3700 3700 ohms
12000 8000 4000 8000 ohms
7.2 7.2 72 7.2
550 450 880 760 milliwatts
4.6 1.6 2.8 1.4 per cent
If the filament is operated on DC. the characteristics will be approximately the same
if the grid voltage. measured from the negative filament, is decreased by 2.3 volts.