DG2

Directly heated double-grid valve for superheterodyne receivers, especially portable sets. It can combine detector and local-oscillator functions in a single frequency-changing stage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4
Base pins: 4
Nominal heater: 2 V / 200 mA

Description

Four-electrode double-grid valve intended particularly for superheterodyne receivers, especially portable sets; usable as a combined detector-oscillator.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4
Base pins: 4
Nominal heater voltage: 2 V
Nominal heater current: 200 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

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 3750 Ω
Transconductance: 0.0012 S
Amplification factor: 4.5
Max plate voltage: 100 V

Published characteristics/ratings were promoted when unambiguous; remaining operating values are preserved 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

192X Marconi Valve

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Inner grid maximum voltage
20 V
Anode current
0.25 to 0.5 mA
Ea=40-80 V; outer grid=-6 to -15 V; inner grid=+2 V
Anode current
1.5 to 2 mA
Ea=20-25 V; outer grid=-13 to -5 V; inner grid=+20 V