Specialized - Cathode Ray ·CathodeRay
21EVP4
Twenty-one-inch cathode-ray tube documented by Philco. The available source identifies it as a CRT but provides insufficient extracted functional detail to justify a narrower television, radar, or instrumentation classification.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 0
- Nominal heater
- -
Description
The 21EVP4 is a cathoderay described in the approved English datasheet.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 0
- Nominal heater voltage
- -
- Nominal heater current
- -
- 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
Cathode Ray
No fixed ratings are recorded for this section.
Published values promoted where clearly attributable to this section.
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.