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1K5G

Directly heated Radiotron pentode for battery-powered Class A voltage amplification, using a 2 V, 120 mA coated filament. Can operate with screen and plate interconnected without creating an additional physical triode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 7
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: 7
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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.00105 S
Max plate voltage: 180 V
Max screen voltage: 135 V
Max plate dissipation: 0.5 W
Max screen dissipation: 0.13 W

Radiotron 1K5-G directly heated 2 V, 120 mA Class A pentode with seven-pin octal base. Maximum anode 180 V, screen 135 V, plate dissipation 0.5 W, screen dissipation 0.13 W. At plate 135 V and screen 67.5 V: gm 0.00105 S and rp about 1 MΩ. Grid-plate capacitance 0.010 pF, input 6.0 pF and output 9.5 pF. Optional triode-connected operation is not a second physical section.

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

Capacitance

Grid To Plate Capacitance
0.01 pF
Input Capacitance
6 pF
Output Capacitance
9.5 pF

Other

Screen Voltage
67.5 V
Grid Voltage
0 V