Data set 01
1946 Standard Telephone and Cables
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Characteristics
Interelectrode capacitances published
1
See source table for individual capacitances
Power - Beam (NOT sweep) ·BeamPower
5B257M
Beam-power amplifier variant in the 5B254 family, intended for professional power-amplifier applications using the family's established electrical characteristics.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 12 V / 470 mA
Description
The 5B257M is a beam-power amplifier in the 5B254 family, electrically based on the 5B254M characteristics.
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 V
- Nominal heater current
- 470 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
Beam Power
X-ray radiationInterelectrode capacitances
- Plate resistance
- 33000 Ω
- Transconductance
- 0.008 S
- Max plate voltage
- 400 V
- Max plate dissipation
- 25 W
- Max cathode current
- 125 mA
Explicit alias/equivalent/co-designation printed in source for 5B254G.
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
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Other
Anode Voltage
350 V
ClassA
Anode Current
54 mA
ClassA
Screen Voltage
250 V
ClassA
Screen Current
2.5 mA
ClassA
Optimum Load
4200 ohm
ClassA
Power Output
11 W
ClassA