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Voltage Tetrode ·Tetrode

B262

Early directly heated Philips screen-grid tetrode for high- and intermediate-frequency amplification, emphasizing high gain and low anode-grid capacitance for receiver RF and IF stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B4
Base pins
4
Nominal heater
2 V / 180 mA

Description

Philips B262 is an early directly heated screen-grid tetrode intended for high- and intermediate-frequency amplification. The datasheet specifies high amplification, low anode-grid capacitance, and screen-grid ratings.

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
-
Socket code
B4
Base pins
4
Nominal heater voltage
2 V
Nominal heater current
180 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

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.0013 S
Max plate voltage
200 V
Max screen voltage
100 V
Max plate dissipation
0.8 W
Max screen dissipation
0.1 W
Max cathode current
5 mA

Published ratings and characteristics promoted where semantically applicable; additional published values 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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Typical anode voltage

    150 V

    Published datasheet value

  • Normal anode current

    2 mA

    Published datasheet value

Characteristics

  • Maximum transconductance

    - to 1.4 mA/V

    Published datasheet value

  • Normal transconductance

    1.3 mA/V

    Published datasheet value

  • Normal internal resistance

    400 kΩ

    Published datasheet value

  • Amplification factor

    500

    Published datasheet value

  • Mean screen-grid current

    0.4 mA

    Published datasheet value

  • Screen-grid current range

    0.1 to 0.7 mA

    Published datasheet value

  • Grid-current starting voltage

    0.4 V

    Published datasheet value

  • Maximum grid-circuit resistance

    - to 1.5 MΩ

    Published datasheet value

  • Anode-grid capacitance

    0.008 pF

    Published datasheet value