(under the class definition) Subject matter including at least two stages of amplification (each stage as defined in the class definition and each stage having a vacuum tube amplifying device) such that, the input signal for each stage, except the first, is the output signal of the preceding stage, and wherein at least one of the cascaded amplifying devices has a significant difference in its characteristics such as a difference in the number of electrodes, or where the construction of each of at least two of the tubes is such that there is a difference in the tube characteristics, or where because of differences in biasing or energizing voltages the tube characteristics are different.
(1) Note. Different types of vacuum tubes representing a genus or class and provided for above such as traveling wave tubes and magnetrons or traveling wave tubes and secondary emission tubes when claimed in cascade are classified elsewhere (see the search this class, subclass notes below) Where vacuum tubes, are different in structural characteristics or some other feature, but all of the plural tubes fall within one of the genus types provided for above, as for example traveling wave tubes classification is with the genus type and not in this subclass.
(2) Note. Beam power tubes, broadly claimed with no other distinctive characteristics, when combined in cascade with another vacuum tube such as an ordinary triode are classified in this subclass and not in subclass 3 or subclasses 44+ above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3, for different types of vacuum tubes representing a genus or class and provided for above such as traveling wave tubes and magnetrons or traveling wave tubes and secondary emission
tubes when claimed in cascade. Where vacuum tubes, are different in structural characteristics or some other feature, but all of the plural tubes fall within one of the genus types provided for above, as for example traveling wave tubes classification is with the genus type and not in this subclass (150) nor in subclass 3.
6, for magnetrons. 42, for traveling wave tubes and secondary emission tubes.
43, for traveling wave tubes.
70+, for series arranged vacuum tube amplifiers including cascaded amplifiers so arranged.
310+, for cascaded semiconductor amplifiers, particularly subclass 311 for cascaded semiconductors of different characteristics.
