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Power - Beam (NOT sweep) ·BeamPower-Triode

35HB8

Triode-pentode designed for stereo and monaural audio equipment, combining a voltage-amplifier triode with a power-output pentode in one series-heater envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9-pin miniature
Socket code: B9A
Base pins: 9
Nominal heater: 35 V / 150 mA

Description

Triode-pentode designed for stereo and monaural audio applications. It uses a nominal 35 V, 0.15 A heater. The supplied datasheet was used for ratings, characteristics, and typical operating data.

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: 9-pin miniature
Socket code: B9A
Base pins: 9
Nominal heater voltage: 35 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9-pin miniature - 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

Transconductance: 0.0039 S
Amplification factor: 74
Max plate voltage: 150 V
Max plate dissipation: 0.75 W
Max cathode current: 5 mA

Published promoted fields populated by semantic section ownership.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.00626 S
Max plate voltage: 150 V
Max screen voltage: 135 V
Max plate dissipation: 6.5 W
Max screen dissipation: 1.5 W
Max cathode current: 50 mA

Published promoted fields populated by semantic section ownership.

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 1

Triode

Characteristic

Transconductance
3900 µS
Amplification Factor
74

Other

Maximum Plate Voltage
150 V
Maximum Plate Dissipation
0.75 W
Maximum Cathode Current
5 mA
Plate Voltage
115 V
Triode section
Plate Current
2.5 mA
Triode section

SECTION 2

Beam Power

Characteristic

Transconductance
6250 µS

Other

Maximum Plate Voltage
150 V
Maximum Screen Voltage
135 V
Maximum Plate Dissipation
6.5 W
Maximum Screen Dissipation
1.5 W
Maximum Cathode Current
50 mA
Plate Voltage
115 V
Beam power section
Screen Voltage
115 V
Beam power section
Zero-Signal Plate Current
33 mA
Load Resistance
3500 ohm
Maximum-Signal Power Output
1 W
Total Harmonic Distortion
8 %

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

TriodeTransconductance
3900 uS
Section1

SECTION 2

Beam Power

Characteristic

PentodeTransconductance
6260 uS
Section2

Other

Power Output
1 W
Section2

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Transconductance
3900 µS
Published datasheet value

Other

MaxPlateVoltage
150 V
Published datasheet value
MaxPlateDissipation
0.75 W
Published datasheet value
MaxCathodeCurrent
5 mA
Published datasheet value
Heater Voltage
35 V
Nominal heater rating
Heater Current
150 mA
Nominal heater rating

SECTION 2

Beam Power

Characteristic

Transconductance
6250 µS
Published datasheet value

Other

MaxPlateVoltage
150 V
Published datasheet value
MaxScreenVoltage
135 V
Published datasheet value
MaxPlateDissipation
6.5 W
Published datasheet value
MaxScreenDissipation
1.5 W
Published datasheet value
MaxCathodeCurrent
50 mA
Published datasheet value
Heater Voltage
35 V
Nominal heater rating
Heater Current
150 mA
Nominal heater rating