3DA3

Rapid-warm-up heater-cathode high-voltage rectifier diode for color television. Its construction includes provisions for controlling X-radiation while supplying the high-voltage CRT accelerating circuit.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 3.15 V / 480 mA

Description

Heater-cathode color-TV high-voltage rectifier diode with a rapid-warm-up heater-cathode design, diffusion-bonded cathode, and X-radiation controls.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 3.15 V
Nominal heater current: 480 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 38000 V
Rectifier nominal output current: 2.2 mA
Rectifier peak forward current: 110 mA
Rectifier forward voltage drop: 60 V
Rectifier warm-up time: 4 s

Promoted from printed flyback-rectifier maximum ratings and average characteristics.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak inverse voltage, DC component
30000 V
FlybackRectifierService
Heater voltage absolute maximum
3.65 V
Heater voltage absolute minimum
2.65 V
X-radiation output maximum
25 mR/hr
At published maximum-rated operating conditions

Capacitance

Plate to heater/cathode/internal shield capacitance
1.6 pF