Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Beam Single (NOT sweep) (under 10W) ·BeamPower

2P9M

Directly heated low-power beam tetrode for HF oscillator and amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2 V / 1 A

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
2 V
Nominal heater current
1 A
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 0

Beam Power

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Beam tetrode; typical Va 250 V, Ia 35 mA, anode power 8 W, Vg1 -6 V, Vg2 150 V.

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

2026 Russian Receiving

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Characteristic

  • Plate Voltage

    250 V

    Typical anode voltage

Other

  • Heater/filament voltage

    2 V

    Filament voltage

  • Heater/filament current

    1 A

    Filament current