Data set 01
1937 Standard Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Anode-filament capacitance
32 pF
Published datasheet value
Grid-filament capacitance
68 pF
Published datasheet value
Voltage - Triode (single) ·Triode
4275A
Directly heated or receiving triode documented by the manufacturer; available source material does not establish a narrower functional category strongly enough for reassignment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- MEDIUM4BAYONET
- Base pins
- 4
- Nominal heater
- 5 V / 1.2 A
Description
The 4275A is a triode described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.
Socket description
Medium 4-contact bayonet base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- MEDIUM4BAYONET
- Base pins
- 4
- Nominal heater voltage
- 5 V
- Nominal heater current
- 1.2 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
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 1000 Ω
- Amplification factor
- 2.8
- Max plate voltage
- 300 V
- Max plate dissipation
- 17 W
- Max cathode current
- 80 mA
Ratings and characteristics extracted from 4275A.pdf.
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 02
1946 Standard Telephone and Cables
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Filament voltage
5 volts
Impedance
1000 ohms
Other
gt anode current o
53 mA
Maximum anode voltage
300 volts
Maximum anode dissipation
17 watts
self-biasing circui
80 mA