Data set 01
1956 RCA Transmitting Tubes
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Construction
Cooling method
Forced air
Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode
4X500A
High-power transmitting tetrode for FM, television, and VHF communications amplifiers, producing approximately 835 W RF output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- SPECIAL4
- Base pins
- 4
- Nominal heater
- 5 V / 13.7 A
Description
4X500A is a Tetrode device. Forced-air-cooled external-anode tetrode for FM, television, and VHF communication transmitter power-amplifier service.
Socket description
Special 4-contact transmitting-tube base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- SPECIAL4
- Base pins
- 4
- Nominal heater voltage
- 5 V
- Nominal heater current
- 13.7 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Tetrode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0052 S
- Amplification factor
- 6.2
- Max plate voltage
- 4000 V
- Max screen voltage
- 500 V
- Max plate dissipation
- 500 W
- Max screen dissipation
- 30 W
- Max grid dissipation
- 10 W
Promoted from printed maximum-rating and general-characteristics tables.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 02
1958 Amperex Industrial
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Plate voltage
4000 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
315 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
835 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-150 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
16 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
120 MHz
Screen voltage
500 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Capacitance
Grid-to-plate capacitance
0.05 pF
Grid-to-filament/cathode capacitance
12.8 pF
Plate-to-filament/cathode capacitance
5.6 pF
Data set 03
1962 Eimac
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Capacitance
Input - - - - - - - - - 10.6 14.4 uuf
14.4 pF
Output = 5 S S - S S - - 49 59 uuf
59 pF
Feedback - - - - . . S S = o S S 0.1 uuf
0.1 pF
Other
Maximum plate voltage
4000 V
Maximum screen voltage
500 V
Maximum plate dissipation
500 W
Maximum screen dissipation
30 W
Maximum grid dissipation
10 W
Data set 04
1963 Amperex Condensed
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Plate voltage
4000 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
315 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
835 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-150 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
16 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
120 MHz
Screen voltage
500 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Capacitance
Grid-to-plate capacitance
0.05 pF
Grid-to-filament/cathode capacitance
12.8 pF
Plate-to-filament/cathode capacitance
5.6 pF