6R7G

Glass-envelope double-diode low-mu triode for detector, AVC, and amplifier service. Two diodes handle signal and control rectification while the low-resistance triode provides greater current drive than high-mu detector types.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Indirectly heated double-diode medium-mu triode for diode detection and triode amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8
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

8 - 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.

Promoted from clearly identified printed ratings/characteristics; additional operating points and capacitances retained in TUBE_SECTION_PARAMETER. The source identifies two independent detector diodes but does not publish separate diode electrical ratings.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second physical detector diode section added in approved section-structure reconciliation.

Section 3

Triode

X-ray radiationInterelectrode capacitances

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

Promoted from clearly identified printed ratings/characteristics; additional operating points and capacitances retained in TUBE_SECTION_PARAMETER.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 3

Triode

Capacitance

Grid-to-plate capacitance
3.5 pF
Section1
Input capacitance
2.5 pF
Section1
Output capacitance
4.5 pF
Section1

Other

Plate voltage
250 V
ClassA
Grid bias
-9 V
ClassA
Plate current
9.5 mA
ClassA
Load resistance
10000 Ω
ClassA
Power output
280 mW
ClassA

Characteristic

Plate resistance
8500 Ω
Section1
Transconductance
1900 µS
Section1
Amplification factor
16
Section1