8414

Subminiature frame-grid sharp-cutoff pentode for VHF RF/IF amplification and mixer service at unusually low plate voltage. Severe-environment construction suits airborne, military, and demanding professional electronics.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8D
Base pins: 8
Nominal heater: 26.5 V / 45 mA

Description

Subminiature frame-grid sharp-cutoff pentode for VHF RF/IF amplifier and mixer service at low plate voltage, designed for severe environmental conditions.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8D
Base pins: 8
Nominal heater voltage: 26.5 V
Nominal heater current: 45 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: 50000 Ω
Transconductance: 0.005 S
Max plate voltage: 55 V
Max screen voltage: 55 V
Max cathode current: 10 mA

Published maximum ratings and characteristics promoted semantically from the approved source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Resistance
50000 ohm
Transconductance
5000 µS

Other

Maximum Plate Voltage
55 V
Maximum Screen Voltage
55 V
Maximum Cathode Current
10 mA
Plate Voltage
26.5 V
Screen Voltage
26.5 V
Plate Current
1.5 mA