Data set 01
1936 Cossor Valve Manual
Published operating points and test conditions from this source.
SECTION 3
Triode
Characteristics
Amplification factor
41
Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode
DDT
Cossor double-diode triode combining receiver detection and voltage amplification. The two diodes provide rectifying detector functions while the triode amplifies the recovered signal, integrating common receiver detector-stage functions within one valve.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater
- 4 V / 1 A
Description
DDT: Cossor combined double-diode triode. The complete Cossor sheet was read for construction, technical data, operating recommendations, and application notes.
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
- 7
- Nominal heater voltage
- 4 V
- Nominal heater current
- 1 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
3 physical sections, each with unique specifications.
Section 1
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Published ratings/characteristics promoted from the approved datasheet.
Section 2
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Published ratings/characteristics promoted from the approved datasheet.
Section 3
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 17000 Ω
- Amplification factor
- 41
- Max plate voltage
- 200 V
Published ratings/characteristics promoted from the approved datasheet.
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
Diode
Other
Filament/Heater Voltage
4 V
Published technical-data value
Filament/Heater Current
1 A
Published technical-data value
Maximum Anode Voltage
200 V
Published technical-data value
Characteristics
Amplification Factor
41
Published technical-data value