Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Maximum Plate Voltage
200 V
Catalog-table value
Voltage Tetrode ·Tetrode
245A
Screen-grid tetrode intended for receiver voltage amplification, detector, oscillator, or general Class-A service as documented by the manufacturer.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- MEDIUM5
- Base pins
- 5
- Nominal heater
- 2 V / 1.6 A
Description
The Western Electric 245A is a tetrode listed in the supplied catalog table.
Socket description
Medium 5-contact transmitting-tube base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- MEDIUM5
- Base pins
- 5
- Nominal heater voltage
- 2 V
- Nominal heater current
- 1.6 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
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 110000 Ω
- Transconductance
- 0.00078 S
- Max plate voltage
- 180 V
- Max screen voltage
- 67.5 V
Promoted fields mapped from published ratings/characteristics; additional published values preserved in parameter table.
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
2026 Western Electric 200s
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Characteristic
Heater voltage
2 volt
Heater voltage 2.0 volts, a.c. or d.c.
Nominal heater current
1.6 amperes
Nominal heater current 1.60 amperes
are shown as functions of plate voltage for several values of control-grid voltage in Figures
3 volt
are shown as functions of plate voltage for several values of control-grid voltage in Figures 3 and
Published value
4 volt
4 for screen-grid voltages of 45 and 67.5 volts, respectively. Plate current, screen-grid current,
Corresponding amplification factor, and plate resistance characteristics are given in Figures
8
Corresponding amplification factor, and plate resistance characteristics are given in Figures 8, 9,
Microphonic Noise—With a plate voltage of
135 volt
Microphonic Noise—With a plate voltage of 135 volts, a screen-grid voltage of 45 volts, a control-
grid bias of
-1.5 volts
grid bias of —1.5 volts, and a load resistance of 100,000 ohms, the mean microphonic noise output