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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

6SR7GT

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

A heater-cathode duplex-diode/medium-mu triode. The two diode sections share the printed entry with a triode section characterized for Class-A voltage-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.

Representative of two identical diode sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8500 Ω
Transconductance
0.0019 S
Amplification factor
16
Max plate voltage
250 V

Medium-mu triode section.

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