Electronic tube and vacuum tube catalog

Base

Refer to variations

Socket code

B4

Sections

1

Heater

4 V / 1 A

Plate

2,500 V

Rectifier

30 mA

4 pins - B4 - European 4-pin base

Directly heated high-voltage half-wave rectifier designed to supply cathode-ray-tube and associated circuits. Its single rectifying section provides modest current at elevated voltage.

Base

—

Socket code

IO

Sections

1

Heater

2 V / 1.85 A

Rectifier

50 mA

V Inverse

12,500 V

IO - International Octal

High-voltage half-wave rectifier intended for television or mains power-supply service. Its single rectifier section emphasizes high inverse voltage and modest current rather than ordinary full-wave operation.