DK40

Battery heptode frequency changer for portable superheterodyne receivers, combining oscillator and mixer action in one low-power valve. Manufacturer data include an economy operating condition emphasizing efficient battery-powered frequency conversion.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 50 mA

Description

Directly heated heptode used as a frequency changer in battery receivers.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: 1.4 V
Parallel heater current: 50 mA
Series capable: Yes

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

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω

Heptode frequency changer for battery receivers.

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

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Heptode

Capacitance

Plate capacitance
9.6 pF
Plate-to-grid-4 capacitance
- to 0.16 pF

Other

Plate voltage
67.5 V
FrequencyChanger
Screen voltage
67.5 V
FrequencyChanger
Plate current
1 mA
FrequencyChanger
Screen current
2.6 mA
FrequencyChanger

Characteristic

Plate resistance
1 Mohm

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Conversion transconductance
425 µS
FrequencyConverter
Economy conversion transconductance
370 µS
EconomyOperation