IW3

Rectifier — B4

Mullard

Known Equivalents & Substitutes

IW4DW15

Similar Tubes (Not Drop-In Compatible)

AZ11

Philips 4 V full-wave rectifier — different base, not pin-compatible

Related rectifier variant — similar application

Electrical Specifications

Absolute Maximum

Anode Voltage (max)AC Voltage per Anode (max RMS)300V

Rectifier

DC Output Current (max)DC Output Current (max)60mA

Heater

Heater VoltageHeater Voltage4V

Heater CurrentHeater Current1A

Notes

The PenA4 datasheet specifies that PenA4 should only be used with the IW4/350 rectifier, but IW3 is a related type.
Brans lists equivalents: DW15, IW4.
Valve_Equivalents lists IW3 as 'Double Diode' on B4 base with 4 V heater.
Full-wave rectifier with two anodes.

Pin Layout — B4

1Anode 1

2Heater / Cathode

3Heater

4Anode 2