12Y4

12Y4 indirectly heated common-cathode dual-diode full-wave rectifier with British five-pin base, 12.8 V 0.15 A heater and 420 V peak inverse voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: 5
Nominal heater: 12.8 V / 150 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 5
Nominal heater voltage: 12.8 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

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 420 V
Rectifier nominal output current: 8 mA
Rectifier peak forward current: 50 mA
Rectifier forward voltage drop: 8 V
Rectifier max heater-cathode voltage: 150 V

RMA 1944 12Y4 plate1 pin4 to common cathode center pin. Per-plate maximum AC supply 150 V RMS, PIV 420 V, peak steady-state current 50 mA, rectified DC output 8 mA. Forward drop 8 V measured at 16 mA DC per plate. Heater-cathode max 150 V DC. Plate1 capacitance to cathode/heater 4.7 pF. Plate-to-plate capacitance 0.7 pF, measured with MS-311 shield connected to cathode.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 420 V
Rectifier nominal output current: 8 mA
Rectifier peak forward current: 50 mA
Rectifier forward voltage drop: 8 V
Rectifier max heater-cathode voltage: 150 V

RMA 1944 12Y4 plate2 pin2 to common cathode center pin. Per-plate maximum AC supply 150 V RMS, PIV 420 V, peak steady-state current 50 mA, rectified DC output 8 mA. Forward drop 8 V measured at 16 mA DC per plate. Heater-cathode max 150 V DC. Plate2 capacitance to cathode/heater 5.0 pF. Plate-to-plate capacitance 0.7 pF, measured with MS-311 shield connected to cathode.

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.

No source-specific operating conditions are recorded.