Specialized - Cathode Ray ·CathodeRay
Early 25-centimeter high-vacuum Philips cathode-ray tube for oscilloscope and oscillograph use. The DB25-1 designation is the blue-screen variant documented alongside the related green-screen DG25-1.
Philips DG25-1 is an early 25 cm high-vacuum cathode-ray tube for oscilloscope and oscillograph use, with a green screen; the DB25-1 version uses a blue screen. This designation is a screen/equivalent variant documented on the same DG251 datasheet.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Published electrical ratings and characteristics promoted where the locked schema provides a matching field; specialized CRT and operating data retained as section parameters.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Screen diameter
25 cm
Published datasheet value
Screen fluorescence
Green for DG25-1; blue for DB25-1
Published datasheet value
Focusing
Electrostatic
Published datasheet value
Deflection
Electrostatic
Published datasheet value
Filament voltage
4 V
Published datasheet value
Filament current
approx. 2.3 A
Published datasheet value