Data set 01
1936 Cossor Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Maximum peak applied signal grid-to-grid
40 V
Published datasheet value
Voltage - Dual Triode (similar) ·Triode-Triode
220B
Cossor 220B directly heated 2 V 0.2 A dual-triode Class B push-pull battery audio output tube, typically operated at 120 V with 12 kΩ plate-to-plate load.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B7
- Base pins
- -
- Nominal heater
- 2 V / 200 mA
Description
Cossor 220B dualtriode for receiver/amplifier service as specified in the supplied catalogue datasheet.
Socket description
Medium 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7
- Base pins
- -
- 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
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Cossor 220B Class B audio output triode, physical half 1 of push-pull pair. At anode 100 V and grid 0 V static anode current per half 1.25 mA. Normal anode 120 V, maximum total anode current swing 35 mA, maximum grid-to-grid signal 40 V; at 120 V average anode current 6 mA without driver, 7.5 mA with Cossor 215P driver. Plate-to-plate load 20 kΩ at 90 V, 12 kΩ at 120 V. These are circuit and combined-pair figures, NOT per-section maximum ratings. No published max plate voltage, dissipation, gm, rp or mu. Never confuse with Western Electric 220B water-cooled single transmitting triode.
Section 2
Triode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Cossor 220B Class B audio output triode, physical half 2 of push-pull pair. At anode 100 V and grid 0 V static anode current per half 1.25 mA. Normal anode 120 V, maximum total anode current swing 35 mA, maximum grid-to-grid signal 40 V; at 120 V average anode current 6 mA without driver, 7.5 mA with Cossor 215P driver. Plate-to-plate load 20 kΩ at 90 V, 12 kΩ at 120 V. These are circuit and combined-pair figures, NOT per-section maximum ratings. No published max plate voltage, dissipation, gm, rp or mu. Never confuse with Western Electric 220B water-cooled single transmitting triode.
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
193X Cossor
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Normal anode voltage
120 V
Published datasheet value
Maximum anode current swing
35 mA
Published datasheet value
Maximum peak applied signal grid-to-grid
40 V
Published datasheet value
Anode-to-anode load at 120 V
12000 ohm
Published datasheet value