Specialized - Thyratron ·Thyratron
Long-life inert-gas and mercury-vapor negative-control thyratron for grid-controlled rectifier and relay service, optimized for repeated starts at extremely low temperatures.
The 6901 is a three electrode, inert-gas and mercury-vapor filled thyra- tron with negative control characteristics. This tube is similar to the type 393A except that the design and test schedule have been modified to provide long life at low temperatures. In some applications, the 6901 provides many times the useful tube life of the 393A. In addition, the peak voltage and frequency limits have been raised. The 6901 finds use as a grid-controlled rectifier and a relay tube especially where many “starts” at extremely low temperatures are anticipated. The 6901 employs a 7-pin octal base.
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.
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 voltage
2.5 V
Nominal
Heater current
7 A
Nominal
Cathode heating time minimum
15 s
-40 to +70 C
Cathode heating time minimum
30 s
-55 to -40 C