1P22B

Russian directly heated, high-durability miniature pentode for high-frequency oscillation and amplification. The 1.2 V, 125 mA oxide-coated filament and flexible leads support compact RF equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.2 V / 125 mA

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: 1.2 V
Nominal heater current: 125 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

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.003 S

Russian 1P22B high-durability directly heated miniature pentode for RF oscillation and amplification, oxide-coated filament 1.2 V 125 mA (110–140 mA specified range), flexible lead base. Published nominal anode 90 V, screen 90 V, grid 1 -4.5 V, transconductance 3.0 mA/V (2.3–3.7 mA/V range), nominal anode current 14 mA (9–18 mA range), stated anode power 2.5 W and microphonics 130 mV. Anode/screen voltage and power specifications are not clearly marked as absolute maxima in available summary; do not promote to maximum rating fields.

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 1

Pentode

Other

Screen Voltage
90 V
Plate Voltage
90 V
Grid Voltage
-4.5 V