1K7G

Directly heated Radiotron dual-diode pentode, combining two signal detector diode plates with a pentode amplifier. Uses a 2 V, 120 mA coated filament and an eight-contact octal base.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: 8
Nominal heater: 2 V / 120 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 8
Nominal heater voltage: 2 V
Nominal heater current: 120 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1250000 Ω
Transconductance: 0.0008 S
Max plate voltage: 180 V
Max screen voltage: 135 V
Max plate dissipation: 0.35 W
Max screen dissipation: 0.07 W

Radiotron 1K7-G directly heated dual-diode pentode, 2 V 120 mA filament, eight-pin octal base. Pentode maxima: anode 180 V, screen 135 V, plate 0.35 W, screen 0.07 W. Typical gm 0.0008 S and rp 1.25 MΩ at plate 135 V, screen 67.5 V. Direct interelectrode capacitances grid-plate 0.015 pF, input 5.0 pF and output 10.5 pF. Two diode plates have distinct connections to opposite filament ends.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

First physical detector diode of directly heated Radiotron 1K7-G dual-diode pentode, 2.0 V 0.12 A coated filament. Manufacturer basing: diode plate No. 1 connected to pin 5 and aligned with the negative end of filament, not a common unipotential cathode. Individual diode maximum current and peak inverse voltage were not published in accessible datasheet; leave unknown ratings NULL. Second diode uses pin 4.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second physical detector diode of directly heated Radiotron 1K7-G dual-diode pentode with coated 2.0 V 0.12 A filament. Plate No. 2 on pin 4 is associated with positive filament end; first diode plate No. 1 on pin 5 is at negative filament end. They are separate physical diode sections, without an assumed common cathode. Individual diode limits unspecified in manufacturer reference and remain NULL.

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

1946 Amalgamated Wireless

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
135 V
Screen Voltage
67.5 V
Grid Voltage
0 V

Capacitance

Input Capacitance
5 pF
Grid To Plate Capacitance
0.015 pF