Specialized - Sensor Tube ·Sensor
Indirectly heated subminiature vacuum thermocouple for currents up to several hundred milliamperes. Thermal conversion provides a millivolt-level measurement signal.
Indirectly heated vacuum thermocouple; TH75 is covered or explicitly cross-referenced on the TH71/TH73/TH75 family sheet. The supplied Philips source was read for heater or filament data, ratings, characteristics, capacitances, and representative operating conditions.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Vacuum thermocouple; heater/thermocouple measuring characteristics retained as parameters.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater current range
0-300 mA
Approximate square-law proportional range
0-100 mA
Heater current at 12 mV output
200 mA
Heater resistance
1.2 ohm
Thermocouple resistance
3.5 ohm
Response time
10 sec
Maximum heater current for 1 minute
350 mA
Maximum heater-to-thermocouple voltage
100 V