7854

Twin tetrode designed for RF power amplifier, oscillator, modulator, and frequency-multiplier service to about 500 MHz. Heat-sink or forced-air cooling is required near maximum ratings.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 1.8 A

Description

7854 is a DualTetrode device in the supplied Amperex literature. Twin tetrode for RF power amplifier, oscillator, modulator, and frequency-multiplier service; heat-sink or forced-air cooling is required near maximum ratings and the tube is useful to 500 MHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 1.8 A
Parallel heater voltage: 6.3 V
Parallel heater current: 1.8 A
Series capable: Yes

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Amplification factor: 8.2
Max plate voltage: 1000 V
Max screen voltage: 300 V
Max plate dissipation: 34 W
Max screen dissipation: 8 W
Max cathode current: 120 mA

Published ratings/characteristics promoted from the source; representative section used for repeated identical systems where applicable.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Amplification factor: 8.2
Max plate voltage: 1000 V
Max screen voltage: 300 V
Max plate dissipation: 34 W
Max screen dissipation: 8 W
Max cathode current: 120 mA

Second identical physical tetrode section; added to align rows with SectionCount.

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 01

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Amplification Factor
8.2

Other

Maximum Plate Voltage
1000 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
34 W
Maximum Screen Dissipation
8 W
Maximum Cathode Current
120 mA

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Plate voltage
1000 V
RFPower
Plate current
200 mA
RFPower
RF output power
134 W
RFPower
Grid voltage
-85 V
RFPower
Grid current
5.4 mA
RFPower
Screen voltage
250 V
RFPower
Maximum frequency at full input rating
175 MHz

Capacitance

Grid-to-plate capacitance
0.09 pF
Input capacitance
11.6 pF
Output capacitance
3.7 pF