TUBE: 811A
FICHIER SOURCE: sheets/049/8/811A.pdf
FABRICANT: RCA (Radio Corporation of America, Harrison NJ)
ANNÉE: 4-63 (April 1963)
LANGUE: en

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811A — Power Triode (RCA)
GENERAL DATA
Electrical:
Filament, Thoriated Tungsten:
Voltage (AC or DC): 6.3 volts
Current: 4 amp
Amplification Factor: 160
Direct Interelectrode Capacitances (Approx.):
Grid to plate:     5.6  pf
Grid to filament:  5.9  pf
Plate to filament: 0.7  pf
Mechanical:
Operating Position: vertical base down, or horizontal pins 1&4 vertical plane
Max Overall Length: 6-15/32"
Seated Length: 5-11/16" ±5/32"
Max Diameter: 2-7/16"
Weight: 2.7 oz
Bulb: ST19
Cap: Medium (JEDEC No.C1-5)
Base: Medium-Shell Small 4-Pin Micanol with Bayonet (JEDEC No.A4-10)
Basing Designation BOTTOM VIEW: 3G
Pinout: Pin 1=Filament; Pin 2=Do Not Use; Pin 3=Grid; Pin 4=Filament; Cap=Plate

AF POWER AMPLIFIER & MODULATOR — Class B
Maximum Ratings, Absolute-Max Values:    CCS         ICAS
DC PLATE VOLTAGE:        1250 max.   1500 max.   volts
MAX-SIGNAL DC PLATE CURRENT: 175 max. 175 max.   ma
MAX-SIGNAL PLATE INPUT:  165 max.    235 max.    watts
PLATE DISSIPATION:       45 max.     65 max.     watts
Typical Operation (values for two tubes):
DC Plate Voltage:    750/1250   1000/1250/1500   volts
DC Grid Voltage:     0/0        0/0/-4.5         volts
Peak AF Grid-to-Grid: 197/145   185/175/170      volts
Zero-Signal DC Plate Current: 32/50   44/54/32    ma

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Max-Signal DC Plate Current: 350/260   350/350/313   ma
Effective Load Resistance (plate to plate): 5100/12400   7400/9200/12400   ohms
Max-Signal Driving Power (approx): 9.7/3.8   7.5/6.0/4.4   watts
Max-Signal Power Output (approx): 178/235    248/310/340   watts

PLATE-MODULATED RF POWER AMP — Class C Telephony (per tube, mod factor 1):
Max Ratings:             CCS         ICAS
DC PLATE VOLTAGE:        1000 max.   1250 max.   volts
DC GRID VOLTAGE:         -200 max.   -200 max.   volts
DC PLATE CURRENT:        125 max.    150 max.    ma
DC GRID CURRENT:         50 max.     50 max.     ma
PLATE INPUT:             115 max.    175 max.    watts
PLATE DISSIPATION:       30 max.     45 max.     watts

RF POWER AMPLIFIER & OSCILLATOR — Class C Telegraphy:
Max Ratings:             CCS         ICAS
DC PLATE VOLTAGE:        1250 max.   1500 max.   volts
DC GRID VOLTAGE:         -200 max.   -200 max.   volts
DC PLATE CURRENT:        175 max.    175 max.    ma
DC GRID CURRENT:         50 max.     50 max.     ma
PLATE INPUT:             175 max.    260 max.    watts
PLATE DISSIPATION:       45 max.     65 max.     watts

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(continuation Class C telegraphy typical operation, cathode resistor bias)
SELF-RECTIFYING AMPLIFIER — Class C:
Max CCS Ratings: AC PLATE VOLTAGE (RMS) 1750 max.; DC GRID VOLTAGE -125 max.; DC PLATE CURRENT 65 max ma; DC GRID CURRENT 25 max ma; PLATE INPUT 125 max watts; PLATE DISSIPATION 45 max watts.
AMPLIFIER — Class C (separate rectified unfiltered single-phase full-wave plate supply):
Max CCS Ratings: DC PLATE VOLTAGE 1125 max volts; DC GRID VOLTAGE -125 max; DC PLATE CURRENT 160 max ma; DC GRID CURRENT 45 max ma; PLATE INPUT 175 max watts; PLATE DISSIPATION 45 max watts.

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LINEAR RF POWER AMPLIFIER — Class AB2 (SSB suppressed-carrier, up to 30 Mc):
Max Ratings: DC PLATE VOLTAGE 1250/1500 max volts; DC PLATE CURRENT 175 max ma; DC GRID CURRENT 50 max ma; DC PLATE INPUT 165/235 max watts; PLATE DISSIPATION 45/65 max watts.
CHARACTERISTICS RANGE VALUES FOR EQUIPMENT DESIGN:
                          Note  Min.   Max.
Filament Current          1     3.75   4.25   amp
Amplification Factor      1,2   144    176
Grid-Plate Capacitance    -     4.9    6.3    pf
Grid-Filament Capacitance -     4.9    6.9    pf

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Plate-Filament Capacitance: 0.52 / 0.88 pf
Plate Current: 16 / 36 ma (note 1,3)
Grid Current: 25 / 85 ma (note 1,4)
Useful Power Output: 160 watts (note 1,5)
Notes 1-5 define test conditions (Vf=6.3V dc, etc.)
OPERATING CONSIDERATIONS: Plate shows no color at max CCS, barely perceptible red at max ICAS.

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MAXIMUM RATINGS vs OPERATING FREQUENCY table (30/60/80/100 Mc -> 100/89/70/55%).
[courbes seules — pas de données tabulaires] Outline drawing ST19 bulb. 92CS-6905R2

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[courbes seules — pas de données tabulaires] Average plate characteristics, Ef=6.3V DC

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[courbes seules — pas de données tabulaires] Operation characteristics, push-pull 2A3 drive + 811A output, Ebb=1250

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[courbes seules — pas de données tabulaires] Operation characteristics, Ebb=1500