Data set 01
1971 English Electric Valve
Published operating points and test conditions from this source.
SECTION 1
RelayControlSwitch
Other
Peak Cathode Current
100 mA
NominalLoadCurrent
13.5 mA
Typical circuit; 12 to 15 mA
Specialized - Switching Tube ·RelayControlSwitch
QT1257
Cold-cathode touch-button tube used as a self-indicating electronic switch. Touching its control electrode triggers gas discharge capable of operating a relay.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- -
Description
Cold-cathode touch-button tube used as a self-indicating electronic switch actuated by touch and capable of operating a relay.
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
- -
- Nominal heater current
- -
- 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
RelayControlSwitch
X-ray radiationInterelectrode capacitances
- Max cathode current
- 25 mA
- Regulator voltage
- 0.08 V
- Regulator maximum current
- 25 mA
- Regulator starting voltage
- 0.325 V
- Regulator maintaining voltage
- 0.08 V
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.