6SR7

Double-diode triode combining radio detector and AVC rectification with subsequent voltage amplification. The paired diodes handle signal and control-voltage functions while the triode provides receiver audio or voltage gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 8O
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Two diodes and a medium-mu triode combined for detector, rectifier, and amplifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8O
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8O - 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.

Published promoted fields populated from printed headings; identical repeated sections compressed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 8500 Ω
Transconductance: 0.0019 S
Amplification factor: 16
Max plate voltage: 250 V
Max plate dissipation: 2.5 W

Published promoted fields populated from printed headings; identical repeated sections compressed.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Triode

Capacitance

Input capacitance
3.6 pF
Output capacitance
2.8 pF
Grid-plate capacitance
2.4 pF

Other

Plate voltage
250 V
ClassA
Grid voltage
-9 V
ClassA
Plate current
9.5 mA
ClassA

Characteristics

Plate resistance
8500 ohm
ClassA
Transconductance
1900 uS
ClassA
Amplification factor
16
ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 2

Triode

Characteristic

TriodeTransconductance
1900 uS
Section2