Alternatives & variations Download PDF datasheet

Voltage Radio Detector Converter ·Diode-Diode-Pentode

6B7

Duplex-diode remote-cutoff pentode combining radio detector and AVC functions with gain-controlled RF or IF amplification. Its variable-mu characteristic permits smooth receiver gain control from the detected AVC voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 7D
Socket code: UX7
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Double-diode high-gain pentode combining detector/AVC diodes with a pentode amplifier section.

Socket description

Small 7-contact (0.75-inch pin circle)

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7D
Socket code: UX7
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7D - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1IS	A	IS — Internal Screen EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN2H	—	H — Heater EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN32P	B	P — Plate (Anode) EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN42K	B	K — Cathode EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN51P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D
PIN81K	A	K — Cathode EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7D

Section ratings

3 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 650000 Ω
Transconductance: 0.001125 S
Amplification factor: 285
Max plate voltage: 300 V
Max screen voltage: 125 V
Max plate dissipation: 2.25 W
Max screen dissipation: 0.3 W
Max cathode current: 15 mA

Remote-cutoff pentode section.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max screen voltage: 100 V
Max cathode current: 1 mA

First diode section.

Section 3

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max screen voltage: 100 V
Max cathode current: 1 mA

Second diode 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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

liaximum Plate Voltage
250 V
ClassA
U ” U T‘h aximum Screen Voltage
125 V
ClassA
Grid to Plate
0.007 pF
ClassA
Input
2.5
ClassA
Output
9.5 pF
ClassA
Plate Voltage
100 V
ClassA; Column1
Plate Voltage
180 V
ClassA; Column2
Plate Voltage
250 V
ClassA; Column3
Plate Voltage
250 V
ClassA; Column4
Screen Voltage
100 V
ClassA; Column1
Screen Voltage
75 V
ClassA; Column2
Screen Voltage
100 V
ClassA; Column3
Screen Voltage
125 V
ClassA; Column4
Amplification Factor
285
ClassA; Column1
Amplification Factor
840
ClassA; Column2
Amplification Factor
800
ClassA; Column3
Amplification Factor
730
ClassA; Column4
Transconductance
950 uS
ClassA; Column1
Transconductance
840 uS
ClassA; Column2
Transconductance
1000 uS
ClassA; Column3
Transconductance
1125 uS
ClassA; Column4
Plate Current
5.8 mA
ClassA; Column1
Plate Current
3.4 mA
ClassA; Column2
Plate Current
6 mA
ClassA; Column3
Screen Current
1.7 mA
ClassA; Column1
Screen Current
9 mA
ClassA; Column2
Screen Current
1.5 mA
ClassA; Column3
Screen Current
2.3 mA
ClassA; Column4
Plate Supply Voltage
250 V
ClassA; Column1
Plate Supply Voltage
250 V
ClassA; Column2
Plate Supply Voltage
250 V
ClassA; Column3
Plate Resistor
0.5 ohm
ClassA; Column1
Plate Resistor
25 ohm
ClassA; Column2
Plate Resistor
27 ohm
ClassA; Column3
Plate Current
0.25 mA
ClassA; Column1
Plate Current
0.65 mA
ClassA; Column2
Plate Current
5.4 mA
ClassA; Column3

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Cathode Current
15 mA

Characteristic

Transconductance
1125 µS
Typical
Plate Resistance
650000 ohm
Typical

SECTION 2

Diode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Cathode Current
1 mA

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Tension de chauffage (CA. ou CC.) .. .. . ... 6,3 volts
6.3 V
Tension de chauffage (CA. ou CC.) .. .. . ... 6,3 volts
Courant de chauffage ... .. .. . o oo .. 0,3 ampére
300 mA
Courant de chauffage ... .. .. . o oo .. 0,3 ampére
Pour une tension continue de 10 volts appliquée A la plaque le
10 V
Pour une tension continue de 10 volts appliquée A la plaque le
Tension de chauffage ... ... 6,3 6,3 6,3 6,3 volts
6.3 V
Tension de chauffage ... ... 6,3 6,3 6,3 6,3 volts
Courant plaque ... .. .. 5,8 3,4 6,0 9,0 ma.
9 mA
Courant plaque ... .. .. 5,8 3,4 6,0 9,0 ma.
Courant de grille écran ... ... 1,7 0,9 1,5 2,3 ma.
2.3 mA
Courant de grille écran ... ... 1,7 0,9 1,5 2,3 ma.
Tension de polarisation® ... —17 —13 —17 =21 volts
21 V
Tension de polarisation® ... —17 —13 —17 =21 volts
Conductance ‘mutuelle ... .. 950 840 1,000 1,125 ymhos
1.125 ymhos
Conductance ‘mutuelle ... .. 950 840 1,000 1,125 ymhos
Tension de chauffage .. ... ... ... .. . 6,3 volts
6.3 V
Tension de chauffage .. ... ... ... .. . 6,3 volts
Tension d’alimentation plaque ... .. ... .. 250 volts
250 V
Tension d’alimentation plaque ... .. ... .. 250 volts
Tension écran ... ... ... .. .. . . L 50 volts
50 V
Tension écran ... ... ... .. .. . . L 50 volts
Courant plague ... ... .o .o e ae e e 0,65 ma.
0.65 mA
Courant plague ... ... .o .o e ae e e 0,65 ma.

Other

Tension de plaque ... ... .. 100 180 250 250 volts max.
250 V
Tension de plaque ... ... .. 100 180 250 250 volts max.
Tension de grille écran ... ... 100 5 100 125 volts max.
125 V
Tension de grille écran ... ... 100 5 100 125 volts max.

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA
Screen-grid voltage
125 V
ClassA
Grid voltage
-3 V
ClassA
Plate current
10 mA
ClassA
Screen-grid current
2.3 mA
ClassA

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heater current
300 mA
Plate current
5.8 mA
Typical operating conditions

SECTION 2

Diode

Other

Heater voltage
6.3 V
Heater current
300 mA

SECTION 3

Diode

Other

Heater voltage
6.3 V
Heater current
300 mA