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Voltage - Triode (single) ·Triode

4D1

General-purpose triode for amplifier and leaky-grid detector service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
-
Nominal heater
1.3 V / 200 mA

Description

General-purpose triode with 13 V heater for amplifier and leaky-grid detector service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
-
Nominal heater voltage
1.3 V
Nominal heater current
200 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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
10000 Ω
Transconductance
0.004 S
Amplification factor
40
Max plate voltage
250 V

General-purpose triode.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    250 V

  • Plate Current

    10 mA

  • Control Grid Voltage

    -3 V

  • Anode Supply Voltage

    250 V

    LeakyGridDetector

  • Anode Load Resistance

    25000 ohm

    LeakyGridDetector

  • Grid Condenser

    200 pF

    LeakyGridDetector

Characteristic

  • Plate Resistance

    10000 ohm

  • Transconductance

    4000 µS

  • Amplification Factor

    40

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Anode Voltage

    250 V

  • Anode Current

    10 mA

  • Control Grid Voltage

    -3 V

  • Cathode Bias Resistor

    300 ohm

Other

  • Grid Condenser

    200 pF

    LeakyGridDetector

  • Grid Leak

    1.5 Mohm

    LeakyGridDetector; approximate midpoint of 1-2Mohm range