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Tube Tinker — Electron Tube Database
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Voltage Tetrode ·Tetrode

30F27

Variable-mu frame-grid VHF tetrode designed for television turret-tuner RF amplification, combining high-frequency gain with controlled cutoff for receiver gain regulation.

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

Description

Screened V.H.F. tetrode with variable-mu characteristics and frame-grid construction for television turret tuners.

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
37 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

Tetrode

X-ray radiationInterelectrode capacitances
Transconductance
0.015 S
Amplification factor
60
Max plate voltage
250 V
Max screen voltage
230 V
Max plate dissipation
2.5 W
Max screen dissipation
0.4 W
Max cathode current
18 mA

VHF variable-mu frame-grid tetrode.

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

Tetrode

Characteristics

  • Typical Anode Voltage

    170 V

    gm measurement

  • Typical Screen Voltage

    140 V

    gm measurement

  • TypicalAnodeCurrent

    13.5 mA

    gm measurement

  • Grid Earth Capacitance

    6.3 pF

  • Anode Grid Capacitance

    0.027 pF