INTRODUCTION
NEED FOR A RATING SYSTEM
The conditions under which an electron tube may be operated arelimited by fundamental capabilities of’ the tube itself. Physicallimitations exist, for example, in the permissible temperatures atwhich the various electrodes may be operated, in the amount ofcurrent which can be emitted by the cathode, and in the voltagegradients which may be permitted between the various tubeelements.
Maximum tube ratings have been established to define thesevarious physical limitations of the tube in terms of readilymeasurable quantities. The numerical quantities presented asmaximum ratings indicate the limiting operating values required toassure satisfactory tube life and performance.
Before the value of any rating can become meaningful, the ratingsystem on which the rating is based must be specìfied. The systemmust define the interpretation required of the numerical values andindicate the procedure necessary to determine whether or not a tubeis operating within its rating.
Until the present time, two rating systems have been commonlyused in conjunction with receiving tubes, the Design-Center Systemand the Absolute-Maximum System.
The problems created by their deficiencies have greatlyintensified in recent years primarily as a result of the greatlyincreased scope of receiving tube applications.
To overcome the deficiencies encountered with the two ratingsystems in current use Maximum System” has been developed.
- Edition:
- 62
- Published:
- 01/01/1962
- Number of Pages:
- 32
- File Size:
- 0 files
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