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7870

Beam-power transmitting tube intended for RF power amplification and communications service, with compact construction and useful high-frequency performance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 1 A

Description

The 7870 is a beam-power transmitting tube. The supplied datasheet was processed for heater or filament data, maximum ratings, operating characteristics, capacitances where published, and service-specific power or frequency data.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 1 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

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.0075 S
Max plate voltage: 750 V
Max screen voltage: 250 V
Max cathode current: 70 mA

Published ratings/characteristics promoted from supplied datasheet.

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

1971 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum DC Plate Voltage
750 V
Inherited from explicitly referenced 7801 parent except heater characteristics
Maximum DC Screen Voltage
250 V
Inherited from explicitly referenced 7801 parent except heater characteristics
Maximum DC Plate Current
70 mA
Inherited from explicitly referenced 7801 parent except heater characteristics
Maximum Plate Input
52.5 W
Inherited from explicitly referenced 7801 parent except heater characteristics
Maximum Screen Input
2 W
Inherited from explicitly referenced 7801 parent except heater characteristics
Typical DC Plate Voltage
650 V
Inherited from explicitly referenced 7801 parent except heater characteristics
Typical DC Screen Voltage
225 V
Inherited from explicitly referenced 7801 parent except heater characteristics
Power Output at 400 MHz
27 W
Inherited from explicitly referenced 7801 parent except heater characteristics
Power Output at 1200 MHz
15 W
Inherited from explicitly referenced 7801 parent except heater characteristics
Power Output at 3000 MHz
3.2 W
Inherited from explicitly referenced 7801 parent except heater characteristics

Characteristics

Transconductance
7500 µS
Inherited from explicitly referenced 7801 parent except heater characteristics
Mu Factor, Screen to Control Grid
30
Inherited from explicitly referenced 7801 parent except heater characteristics
Grid-No.1 to Plate Capacitance
0.025 pF
Inherited from explicitly referenced 7801 parent except heater characteristics