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Voltage Pentode ·Pentode

30F5

High-slope screened HF pentode designed as a straight television amplifier in AC/DC series-heater receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B9A
Socket code
B9A
Base pins
9
Nominal heater
7.3 V / 300 mA

Description

High-slope screened HF pentode intended as a straight television pentode in AC/DC series-heater 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
B9A
Socket code
B9A
Base pins
9
Nominal heater voltage
7.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B9A - 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
Transconductance
0.0088 S
Amplification factor
55
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
3 W
Max screen dissipation
1 W

High-slope screened HF pentode.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical Anode Voltage

    170 V

  • Typical Screen Voltage

    170 V

  • TypicalAnodeCurrent

    10 mA

  • Typical Screen Current

    2.6 mA

Characteristics

  • Grid Earth Capacitance

    9 pF

Data set 02

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater or filament voltage

    7.3 V

    Published nominal value

  • Heater or filament current

    300 mA

    Published nominal value

  • Transconductance

    8800 µS

    Published operating characteristic

Other

  • Maximum plate dissipation

    3 W

    Published maximum rating