8526

Micro-metal miniature medium-mu twin triode designed for high-frequency through VHF circuitry and on-off control service, combining RF amplification and switching capability.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Medium-mu micro-metal miniature twin triode designed for high-frequency through VHF circuits and on-off control service.

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: 4000 Ω
Transconductance: 0.005 S
Amplification factor: 20
Max plate voltage: 165 V
Max plate dissipation: 0.95 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: 4000 Ω
Transconductance: 0.005 S
Amplification factor: 20
Max plate voltage: 165 V
Max plate dissipation: 0.95 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

Other

Plate voltage
100 V
ClassA;EachSection
Cathode bias resistor
220 Ohm
ClassA;EachSection
Plate current
8.5 mA
EachSection
Plate voltage maximum
165 V
EachSection
Plate current maximum
22 mA
EachSection
Grid current maximum
5.5 mA
EachSection
Plate dissipation maximum
0.95 W
EachSection

Characteristics

Amplification factor
20 ratio
EachSection
Plate resistance
4000 Ohm
EachSection
Transconductance
5000 uS
EachSection