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42

Pentode power amplifier for receiver output stages, electrically related to 6F6/2A5 types apart from heater differences. Designed for conventional audio-frequency power delivery.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 6B
Socket code: B6
Base pins: 6
Nominal heater: 6.3 V / 700 mA

Description

Pentode power amplifier for receiver power-output stages; electrically identical to 6F6/2A5 types except for heater ratings.

Socket description

European 6-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 6B
Socket code: B6
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 700 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

6B - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 78000 Ω
Transconductance: 0.00285 S
Amplification factor: 3.5
Max plate voltage: 415 V
Max screen voltage: 315 V
Max plate dissipation: 12.1 W
Max screen dissipation: 4.13 W
Max cathode current: 50 mA

Pentode absolute maximum ratings promoted; representative Class A pentode characteristics promoted. Triode-connected ratings/operating points are preserved as parameters rather than treated as a separate physical 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

Plate Voltage
285 V
ClassA
Screen Voltage
285 V
ClassA
Load Resistance
7000 ohm
ClassA
Power Output
4.8 W
ClassA

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
700 mA
Nominal
Maximum Plate Voltage
375 V
Maximum Screen Voltage
315 V
Maximum Cathode Current
50 mA

Characteristic

Transconductance
2600 µS
Typical
Amplification Factor
260
Typical
Plate Resistance
100000 ohm
Typical

Data set 03

1946 Amalgamated Wireless

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater or filament voltage
2.5 V
Published nominal rating
Output capacitance
1.85 pF
Direct interelectrode capacitance

Data set 04

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
250 V
Plate Current
34 mA
Screen Voltage
250 V
Screen Current
6.5 mA
Control Grid Voltage
-16.5 V
Optimum Load
7000 ohm
Power Output
3.2 W
Harmonic Distortion
8 %

Characteristic

Plate Resistance
80000 ohm
Transconductance
2500 µS

Data set 05

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Transconductance
2600 µS

Other

Operating Mode
Push-pull Class A / triode-connected Class AB

Data set 06

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

CrossReference

Reference characteristics
6F6G

Application

Application
Audio power output

Data set 07

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
285 V
ClassA
Screen Voltage
285 V
ClassA
Load Resistance
7000 ohm
ClassA
Power Output
4.8 W
ClassA

Data set 08

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
700 mA
Application
Class A and push-pull audio output

Data set 09

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Power Output
4.8 W
ClassA1
Power Output
18.5 W
PushPull

Data set 10

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
ClassA;SingleTube
Screen voltage
250 V
ClassA;SingleTube
Control grid voltage
-16.5 V
ClassA;SingleTube
Zero-signal plate current
34 mA
ClassA;SingleTube
Zero-signal screen current
6.5 mA
ClassA;SingleTube
Maximum-signal plate current
36 mA
ClassA;SingleTube
Maximum-signal screen current
10.5 mA
ClassA;SingleTube
Load resistance
7000 ohm
ClassA;SingleTube
Power output
3.2 W
ClassA;SingleTube
Total harmonic distortion
8 %
ClassA;SingleTube
Effective plate-to-plate load resistance
10000 ohm
PushPull;TwoTubes;ClassA
Power output
11 W
PushPull;TwoTubes;ClassA

Data set 11

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

D-C heater-cathode voltage maximum
100 V
Triode-connected plate voltage absolute maximum
385 V
TriodeConnection
Triode-connected plate dissipation absolute maximum
11 W
TriodeConnection
Maximum-signal power output
4.8 W
ClassA;PentodeConnection
Effective load resistance plate-to-plate
10000 ohm
PushPull;ClassAB;PentodeConnection
Maximum-signal power output
19 W
PushPull;ClassAB;PentodeConnection;CathodeBias
Maximum-signal power output
13 W
PushPull;ClassAB;TriodeConnection

Characteristic

Plate resistance
80000 ohm
ClassA;PentodeConnection;Plate250V;Screen250V
Transconductance
2500 uS
ClassA;PentodeConnection;Plate250V;Screen250V
Plate resistance
2600 ohm
ClassA;TriodeConnection
Transconductance
2600 uS
ClassA;TriodeConnection