Data set 01
1936 Cossor Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
Inter-electrode capacitance
0.001 pF
Published datasheet value
Voltage Tetrode ·Tetrode
220SG
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
- B4
- Base pins
- 4
- Nominal heater
- 2 V / 200 mA
Description
Two-volt screened-grid tetrode for H.F. amplification, detection, and oscillator service.
Socket description
European 4-pin base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B4
- Base pins
- 4
- Nominal heater voltage
- 2 V
- Nominal heater current
- 200 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
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 200000 Ω
- Transconductance
- 0.0016 S
- Amplification factor
- 320
- Max plate voltage
- 150 V
Cossor 220 S.G. directly heated 2 V 0.2 A screened-grid tetrode for high-frequency amplification, detection and dynatron oscillator/laboratory use. Maximum anode voltage 150 V; normal working anode voltage 120 V; recommended positive screen voltage 60–80 V is a working range, not explicitly absolute maximum. Plate resistance (impedance) 200 kΩ, amplification factor 320 and mutual conductance 1.6 mA/V (0.0016 S). At Va 150 V, no grid bias anode current 3.1 mA; at -1.5 V grid approximately 0.7 mA. Interelectrode capacitance about 0.001 pF. Screen maximum and maximum dissipation not supplied.
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.