25F5A

Beam-power tube whose supplied datasheet documents heater, ratings, characteristics, and operating data through an explicitly referenced 6-volt parent type.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 25 V / 150 mA

Description

The 25F5A is a beam power tube. The supplied datasheet was used for heater, ratings, characteristics, and operating data; where the sheet explicitly states equivalence to a 6-volt parent, that parent electrical data is inherited while retaining this tube's heater characteristics.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 25 V
Nominal heater current: 150 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

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 13000 Ω
Transconductance: 0.0064 S
Max plate voltage: 150 V
Max screen voltage: 130 V
Max plate dissipation: 5.5 W
Max screen dissipation: 1.1 W

beam power

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

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum Plate Voltage
150 V
Maximum Screen Voltage
130 V
Plate Dissipation
5.5 W
Screen Input
1.1 W
Plate Voltage
110 V
Screen Voltage
110 V

Characteristics

Plate Resistance
13000 Ω
Transconductance
6400 µS