1U6

Extremely low-consumption battery pentagrid converter for portable superheterodyne receivers. Its very low filament current minimizes battery drain while the multi-grid structure combines oscillator and mixer functions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7DC
Socket code: B7G
Base pins: 7
Nominal heater: 1.4 V / 25 mA

Description

A miniature directly heated pentagrid converter for battery-operated radio service, with separate oscillator and mixer functions and published conversion characteristics.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7DC
Socket code: B7G
Base pins: 7
Nominal heater voltage: 1.4 V
Nominal heater current: 25 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7DC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1F	—	F — Filament Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN2P	A	P — Plate (Anode) Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN3G2	A	G2 — Screen Grid Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN4G1	A	G1 — Control Grid Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN5G3	A	G3 — Suppressor GridGroup 7DC5 Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN5G5	A	G5 — Fifth GridGroup 7DC5 Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN6G4	A	G4 — Fourth Grid Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC
PIN7F	—	F — Filament Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DC

Section ratings

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 550000 Ω
Max plate voltage: 110 V
Max screen voltage: 110 V

Directly heated pentagrid converter for oscillator-mixer service in 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate voltage
90 V
ClassA; OperatingPoint1
Screen voltage
45 V
ClassA; OperatingPoint1
Control-grid bias
0 V
ClassA; OperatingPoint1
Plate current
0.6 mA
ClassA; OperatingPoint1
Screen current
0.6 mA
ClassA; OperatingPoint1
Oscillator-grid current
0.028 mA
Converter
Oscillator-grid resistor
200000 ohm
Converter
Oscillator plate voltage
90 V
Converter
Oscillator plate current
1.1 mA
Converter
Maximum plate voltage
110 V
Maximum screen voltage
65 V

Characteristics

Plate resistance
500000 ohm
ClassA; OperatingPoint1
Conversion transconductance
300 uS
ClassA; OperatingPoint1

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Heater voltage
1.4 V
Nominal
Heater current
25 mA
Nominal