572B POWER TRIODE
572B
POWER
TRIODE
The Penta Laboratories is a power triode designed for use as a RF Oscillator, RF Power Amplifier and
audio frequency modulator. The 572B is a direct replacement for the 811A, but has a graphite anode for
increased performance and reliability.
Electrical Characteristics
Filament Voltage.............................................................................. 6.3 Volts
Fialment Current ............................................................................. 4.0 Amperes
Amplification Factor......................................................................... 170
Direct Interelectrode Capacitiances
Grip to Plate............................................................................... 6 pF
Grid to Filament......................................................................... 5.9 pF
Plate to Filament ....................................................................... 0.8 pF
Mechanical Characteristics
Mounting Position
Vertical ...................................................................................... Base Down
Horizontal .................................................................................. Pins 1 and 4 in vertical plane
Cooling ............................................................................................ Radiation
Socket ............................................................................................. Medium 4-Pin
Dimensions
Diameter (typical) ...................................................................... 2.063 inches
Length (typical).......................................................................... 6.5 inches
Revised 12 Feb 2004
P E N T A L A B O R A T O R I E S
9740 COZYCROFT AVENUE * CHATSWORTH * CALIFORNIA 91311
(800) 421-4219 * (818) 882-3872 * FAX: (818) 882-3968
ELECTRON TUBES FOR INDUSTRY
1
572B POWER TRIODE
Maximum Ratings
Audio Frequency Power Amplifier and Modulator, Class B
DC Plate Voltage............................................................................. 2000 Volts
Maximum Signal DC Plate Current ................................................. 225 mA
Maximum Signal Plate Input ............................................................ 600 Watts
Plate Dissipation ............................................................................. 160 Watts
RF Power Amplifier and Oscillator, Class C Telegraphy
DC Plate Voltage............................................................................. 2000 Volts
DC Plate Current............................................................................. 200 mA
DC Grid Voltage .............................................................................. -200 Volts
DC Grid Current .............................................................................. 50 mA
Plate Input ....................................................................................... 400 Watts
Plate Dissipation ............................................................................. 100 Watts
Plate Modulated RF Power Amplifier, Class C Telephony
DC Plate Voltage............................................................................. 1650 Volts
DC Plate Current............................................................................. 165 mA
DC Grid Voltage .............................................................................. -200 Volts
DC Grid Current .............................................................................. 50 mA
Plate Input ....................................................................................... 270 Watts
Plate Dissipation ............................................................................. 65 Watts
2
Loading...