26BK6

Double-diode high-mu triode for detector, AVC, and voltage-amplifier service in low-current series-string equipment. Paired diodes provide signal and control rectification while the triode supplies substantial gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 26.5 V / 70 mA

Description

Double-diode high-mu triode for detector and amplifier service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: 7
Nominal heater voltage: 26.5 V
Nominal heater current: 70 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

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Representative row for two diode units; average diode current 4 mA each at 40 V DC.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100

High-mu triode; representative characteristics at published operating condition.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Added approved missing physical diode section row.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 2

Triode

Characteristic

Average Diode Current
4 mA
EachDiode;AppliedVoltage=40V