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3B25

RCA directly heated gas-filled high-voltage half-wave rectifier for transmitting and industrial supplies. Its heavy filament and gas-assisted conduction provide substantial current at high voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.5 V / 6 A

Description

The RCA 3B25 is a gas-filled high-voltage half-wave rectifier. The supplied source provides transmitting, RF, or rectifier ratings appropriate to this device.

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: 2.5 V
Nominal heater current: 6 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 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 10000 V
Rectifier nominal output current: 250 mA
Rectifier peak forward current: 1 A

Gas-filled high-voltage half-wave rectifier.

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

1956 RCA Transmitting Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum Plate/Inverse Voltage
10000 V
Source rating
Maximum Average Anode Current
250 mA
At 10000V PIV

Characteristics

Peak Tube Voltage Drop
10 V