Alternatives & variations Download PDF datasheet

Voltage Radio Detector Converter ·Diode-Diode-Pentode

6B8

Double-diode remote-cutoff pentode for detector, AVC, and gain-controlled receiver amplification. The paired diodes handle signal and control-voltage rectification while the pentode provides controlled RF or IF gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Duo-diode high-gain pentode combining two diode sections with a pentode amplifier.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

3 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 600000 Ω
Transconductance: 0.001325 S
Amplification factor: 800
Max plate voltage: 335 V
Max screen voltage: 110 V
Max cathode current: 15 mA

Source-defined physical/function section.

Section 2

Diode

X-ray radiationInterelectrode capacitances

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

Source-defined physical/function section.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Source-defined physical/function 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 Ken Rad

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate Voltage
250 V
Plate Voltage 250 Ka... Yolts
Screen Voltage
125 V
Screen Voltage 125 Max. Volts
Grid Voltage
-3 V
Grid Voltage -3 Volts
Plate Current
10 A
Plate Current 10.0 ¥illiamperes
Screen Current
2.3 mA
Screen Current 2.3 Milliamperes
Plate Resistance
0.6 Mohm
Plate Resistance 0.6 Approx. Megohm
Mutual Conductance
1325 µS
Mutual Conductance 1325 Micromhos
Grid Voltage
-21 V
*Grid Voltage -21 Approx. Volts

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Hax, Screen Voltage
125 V
Published table
Plate Voltage
250 V
ClassA
grid Bias
-3 V
ClassA
Amplification Factor
800
ClassA
Plate Resistance
0.6 ohm
ClassA
Plate Current
10 mA
ClassA
Screen Current
2.3 mA
ClassA
Grid Bias for Cathode Current Cutoff =
21 V
ClassA

Capacitance

Grid to Plate
0.008
Published table
Input
6 pF
Published table
output
9 pF
Published table

Data set 03

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
1325 µS
Typical
Amplification Factor
800
Typical
Plate Resistance
600000 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 04

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Tension chauffage CA, ou CC, ... ... 6,3 6,3 volts
6.3 V
Tension chauffage CA, ou CC, ... ... 6,3 6,3 volts
Courant chauffage ... .. .. .. .. 0,3 0,3 ampére
300 mA
Courant chauffage ... .. .. .. .. 0,3 0,3 ampére
Tension chauffage CA. ou CC. ... .. o ... 6,3 volts
6.3 V
Tension chauffage CA. ou CC. ... .. o ... 6,3 volts
Courant chauffage ... ... 0,3 volt
0.3 V
Courant chauffage ... ... 0,3 volt
Tension de grille ... ... 0 volt min,
0 V
Tension de grille ... ... 0 volt min,
Pour une tension continue plaque de 10 volts le courant dépassera
10 V
Pour une tension continue plaque de 10 volts le courant dépassera
Tension de chauffage ... ... .. .. 6,3 volts —
6.3 V
Tension de chauffage ... ... .. .. 6,3 volts —
Courant de chauffage ... ... .. .. 0,3 ampére _—
300 mA
Courant de chauffage ... ... .. .. 0,3 ampére _—
Courant écran ... 2,3 ma. —
2.3 mA
Courant écran ... 2,3 ma. —

Other

Tension plaque ... 300 volts max.
300 V
Tension plaque ... 300 volts max.
Source tension gnlle ecran 300 volts max.
300 V
Source tension gnlle ecran 300 volts max.
Tension grille écran ... ... .. i we o aes 125 volts max.
125 V
Tension grille écran ... ... .. i we o aes 125 volts max.
Dissipation plaque .. .. e el 2,25 watts max,
2.25 W
Dissipation plaque .. .. e el 2,25 watts max,
Dissipation écran 0,3 watt max.
0.3 W
Dissipation écran 0,3 watt max.
Tension plaque ... ... .. . a0 .. 250 volts max. —
250 V
Tension plaque ... ... .. . a0 .. 250 volts max. —

Data set 05

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 06

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
10 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