Specialized - Sensor Tube ·Sensor
Indirectly heated subminiature vacuum thermocouple for low-current electrical measurement. Thermal coupling converts heater current into a small thermoelectric instrumentation signal.
Indirectly heated vacuum thermocouple; TH71 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
0-15 mA
Approximate square-law proportional range
0-5 mA
Heater current at 12 mV output
10 mA
Heater resistance
6.8 ohm
Thermocouple resistance
6 ohm
Response time
10 sec
Maximum heater current for 1 minute
20 mA
Maximum heater-to-thermocouple voltage
100 V