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Voltage - Triode (single) ·Triode

A409

General-purpose receiving triode for detection, amplification, oscillator, or low-power electronic service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
A32-1
Socket code
B4
Base pins
4
Nominal heater
4 V / 65 mA

Description

Directly heated battery triode for low-power receiver amplifier service.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
A32-1
Socket code
B4
Base pins
4
Nominal heater voltage
4 V
Nominal heater current
65 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

A32-1 - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
10000 Ω
Transconductance
0.0009 S
Amplification factor
9
Max plate voltage
150 V

Promoted only from clearly identified published characteristics/limits; additional operating, capacitance, regulator, gas-tube, and push-pull data retained as section parameters.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate current

    3.5 mA

    BatteryValve

  • Control-grid voltage

    -9 V

    BatteryValve

Characteristic

  • Plate resistance

    10000 Ω

    Section1

  • Transconductance

    900 µS

    Section1

  • Amplification factor

    9

    Section1

Capacitance

  • Grid-to-anode capacitance

    4 pF

    Section1

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Saturation current

    20 mA

  • Anode-grid capacitance

    2.5 pF