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DA7700

Philips directly heated high-vacuum rectifier for high-voltage DC supplies. Its 12.5 V filament supports approximately 4–7 kV RMS anode service and 100 mA mean rectified current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.5 V / 7.7 A

Description

Philips DA7700 is a directly heated high-vacuum rectifier with a 12.5 V, 7.7 A filament. Published service covers 4000–7000 V RMS anode voltage and 100 mA mean rectified current, with 400 W allowable anode dissipation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 12.5 V
Nominal heater current: 7.7 A
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

Plate resistance: 1500 Ω
Max plate dissipation: 400 W
Rectifier nominal output current: 100 mA

Published ratings and characteristics promoted where a locked-schema field is semantically applicable; additional values retained as parameters.

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Saturation current
450 mA
Published datasheet value
Saturation voltage
700 V
Published datasheet value
Internal resistance
1500 Ω
Published datasheet value

Other

Anode dissipation
- to 400 W
Published datasheet value
Anode dissipation test value
500 W
Published test value
RMS anode A.C. voltage range
4000 to 7000 V
Published datasheet value
D.C. output voltage range
4000 to 7000 V
Published datasheet value
Mean rectified D.C. current
- to 100 mA
Published datasheet value
Useful D.C. output power
700 W
Published datasheet value