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Voltage Pentode - Sharp Cutoff (single) ·Pentode-Triode

6BA8

Medium-mu triode plus sharp-cutoff pentode designed for 600 mA series-string television receiver circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 600 mA

Description

Medium-mu triode plus sharp-cutoff pentode for 600 mA series-string television receivers.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 600 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6000 Ω
Transconductance: 0.0065 S
Amplification factor: 40
Max plate voltage: 300 V
Max plate dissipation: 2 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Published promoted fields populated semantically; identical repeated sections compressed where applicable.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 250000 Ω
Transconductance: 0.009 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 3.25 W
Max screen dissipation: 1 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Published promoted fields populated semantically; identical repeated sections compressed where applicable.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 2

Pentode

Characteristic

Heater Current................ 600 600 450 Ma
450 mA
Heater Current................ 600 600 450 Ma
Output. . ... ... ... 4.5 3.6 puf
3.6 pF
Output. . ... ... ... 4.5 3.6 puf
Grid No. 2 Supply Voltage.. 300 Volts
300 V
Grid No. 2 Supply Voltage.. 300 Volts
Piate Dissipation. ....... ... ........... 2.0 3.25 Watts
3.25 W
Piate Dissipation. ....... ... ........... 2.0 3.25 Watts
Grid No. 2 Dissipation. . ....... ... ... .. 1.0 Watt
1 W
Grid No. 2 Dissipation. . ....... ... ... .. 1.0 Watt
Negative Grid No. 1 Voltage............ 50 Volts
50 V
Negative Grid No. 1 Voltage............ 50 Volts
Positive Grid No. 1 Voltage... ... . ... ... 0 Volts
0 V
Positive Grid No. 1 Voltage... ... . ... ... 0 Volts
Grid No. 2 Voltage. ... ................ 150 Volts
150 V
Grid No. 2 Voltage. ... ................ 150 Volts
Grid No.1 Voltage. . . ................. -8 0 Volts
0 V
Grid No.1 Voltage. . . ................. -8 0 Volts
Plate Resistance (approx.).............. 6700 400,000 Ohms
400 Ohms
Plate Resistance (approx.).............. 6700 400,000 Ohms
Plate Current. . ... ... ... ... .. ... ..., 8.0 13 Ma
13 mA
Plate Current. . ... ... ... ... .. ... ..., 8.0 13 Ma
Grid No. 2 Current. .. .. ... .. ... ... ... 3.5 Ma
3.5 mA
Grid No. 2 Current. .. .. ... .. ... ... ... 3.5 Ma
Grid No. 1 Voltage for 1, = 10 ua (approx.) -16 -10 Volts
-10 V
Grid No. 1 Voltage for 1, = 10 ua (approx.) -16 -10 Volts

Other

Grid No. 2 Voltage. .. ...... . See Rating Chart for Type 6AMS8
2 V
Grid No. 2 Voltage. .. ...... . See Rating Chart for Type 6AMS8

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Warmup Time
11 s

SECTION 2

Pentode

Characteristic

PentodeTransconductance
9000 uS
Section2

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
TriodeSection
Plate current
10 mA
TriodeSection

Characteristic

Plate resistance
6000 Ω
TriodeSection
Transconductance
6500 µS
TriodeSection
Amplification factor
40
TriodeSection

SECTION 2

Pentode

Other

Plate voltage
125 V
PentodeSection
Screen voltage
125 V
PentodeSection
Plate current
12 mA
PentodeSection
Screen current
3.5 mA
PentodeSection

Characteristic

Plate resistance
250000 Ω
PentodeSection
Transconductance
9000 µS
PentodeSection
Cutoff characteristic
Sharp
PentodeSection