3AZP31

ETEL 3AZP31 dual-gun electrostatic-focus and electrostatic-deflection oscilloscope CRT with flat green P31 screen, B12F base and 6.3 V 1.25 A parallel-only heater.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 2
Base: B12F
Socket code: -
Base pins: 12
Nominal heater: 6.3 V / 1.25 A

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B12F
Socket code: -
Base pins: 12
Nominal heater voltage: 6.3 V
Nominal heater current: 1.25 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B12F - 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

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 1800 V
Max screen voltage: 600 V
Max plate dissipation: 2 W

Gun 1 (primed electrode set). ETEL 3AZP31: max combined anodes1+3 1800 V, min 1000 V; anode2 focusing max 600 V; grid negative max magnitude 200 V, peak heater-cathode max 250 V, deflection plate-to-anodes1+3 max 300 V, anode dissipation max 2 W. Typical anodes1+3 1500 V, anode2 330–470 V, grid cutoff -42 to -95 V, anode2 current max 125 µA; X 23 V/cm, Y 16 V/cm. Gun1 capacitances: grid-to-all 5.2–7.4 pF, cathode-to-all 3.0–4.6 pF, X1-to-all (X2 earthed) 4.5–6.5 pF, X2-to-all (X1 earthed) 4.6–7.2 pF, Y1-to-all (Y2 earthed) 2.0–4.0 pF, Y2-to-all (Y1 earthed) 2.8–4.4 pF, X1-X2 max 1.7 pF, Y1-Y2 1.5–2.5 pF. Combined screen power limit both guns 3 mW/cm².

Section 2

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 1800 V
Max screen voltage: 600 V
Max plate dissipation: 2 W

Gun 2 (double-primed electrode set). ETEL 3AZP31: max combined anodes1+3 1800 V, min 1000 V; anode2 focusing max 600 V; grid negative max magnitude 200 V, peak heater-cathode max 250 V, deflection plate-to-anodes1+3 max 300 V, anode dissipation max 2 W. Typical anodes1+3 1500 V, anode2 330–470 V, grid cutoff -42 to -95 V, anode2 current max 125 µA; X 23 V/cm, Y 16 V/cm. Gun2 capacitances: grid-to-all 5.0–7.2 pF, cathode-to-all 3.0–4.6 pF, X1-to-all (X2 earthed) 4.5–6.5 pF, X2-to-all (X1 earthed) 4.6–7.2 pF, Y1-to-all (Y2 earthed) 2.8–4.4 pF, Y2-to-all (Y1 earthed) 2.0–4.0 pF, X1-X2 max 1.7 pF, Y1-Y2 1.5–2.5 pF. Combined screen power limit both guns 3 mW/cm².

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.