6540

Rugged sharp-cutoff subminiature pentode designed for RF amplifier service under severe environmental conditions. Its compact construction combines fixed-gain high-frequency amplification with enhanced mechanical durability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

Rugged sharp-cutoff subminiature pentode for RF amplifier service under severe environmental conditions.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 150000 Ω
Transconductance: 0.005 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max cathode current: 20 mA

Published maximum ratings and typical characteristics promoted from the approved source; identical repeated sections compressed where applicable.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
200 mA
Nominal
Maximum Plate Voltage
165 V
Maximum Screen Voltage
155 V
Maximum Cathode Current
20 mA

Characteristic

Transconductance
5000 µS
Typical
Plate Resistance
150000 ohm
Typical