8525

Micro-metal miniature medium-mu twin triode intended for high-frequency and ruggedized applications, combining compact metal construction with paired amplifier sections.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B8D
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

Medium-mu twin triode of micro-metal miniature construction for high-frequency and ruggedized applications.

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: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6500 Ω
Transconductance: 0.0054 S
Amplification factor: 35
Max plate voltage: 165 V
Max plate dissipation: 0.7 W
Max cathode current: 22 mA

Promoted fields are used only where the published value maps cleanly to the locked schema; device-specific microwave, pulse, photoelectric, camera, and indicator data are preserved as parameter rows.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6500 Ω
Transconductance: 0.0054 S
Amplification factor: 35
Max plate voltage: 165 V
Max plate dissipation: 0.7 W
Max cathode current: 22 mA

Second physical triode 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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Plate voltage
100 V
ClassA;EachSection
Cathode resistor
150 Ohm
ClassA;EachSection
Amplification factor
35 ratio
ClassA;EachSection
Plate resistance
6500 Ohm
ClassA;EachSection
Transconductance
5400 uS
ClassA;EachSection
Plate current
6.5 mA
ClassA;EachSection

Other

Plate voltage maximum
165 V
EachSection
Plate current maximum
22 mA
EachSection
Grid current maximum
5.5 mA
EachSection
Plate dissipation maximum
0.7 W
EachSection