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Tube Tinker — Electron Tube Database
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Voltage Dual Tetrode ·Tetrode-Tetrode

8457

Twin tetrode designed for Class-C RF amplifier, oscillator, frequency-multiplier, and modulator service to approximately 200 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.75 V / 760 mA

Description

Twin tetrode for Class C amplifier, oscillator, frequency-multiplier and modulator service to 200 Mc.

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
6.75 V
Nominal heater current
760 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

Tetrode

X-ray radiationInterelectrode capacitances
Transconductance
0.0033 S
Amplification factor
7.5

Representative row for two electrically identical tetrode sections.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances
Transconductance
0.0033 S
Amplification factor
7.5

Second physical tetrode section; added to align rows with SectionCount.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • Output Capacitance

    1.4 pF

    Published direct interelectrode capacitance

  • Input Capacitance

    5.1 pF

    Published direct interelectrode capacitance