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Class Information
Number: 330/27P
Name: Amplifiers >

Sub-classes under this class:

Class Number Class Name Patents
330/10 Modulator-demodulator-type amplifier 1,105
330/11 With d.c. reinsertion circuit 48
330/113 Polyphase power supply (i.e., for an electrode, cathode heater, or filament) 1
330/114 Unrectified a.c. power supply for an electrode (i.e., not the heater) 0
330/116 With balanced-to-unbalanced coupling 13
330/117 With unbalanced-to-balanced coupling 19
330/118 Including a push-pull stage 25
330/124R With plural amplifier channels (e.g., parallel amplifier channels) 978
330/127 With control of power supply or bias voltage 245
330/143 Thermally responsive impedance 18
330/144 Variable impedance for signal channel controlled by separate control path 134
330/146 Wheatstone bridge with amplifier in at least one arm 130
330/147 Plural signal inputs 62
330/148 Plural signal outputs 43
330/149 Hum or noise or distortion bucking introduced into signal channel 1,516
330/150 Cascaded similar amplifying device of different characteristics 45
330/151 With amplifier bypass means (e.g., forward feed) 591
330/152 Cascaded differently coupled between stages 5
330/155 Unicontrol of coupling or the circuits associated therewith 4
330/156 Bootstrap coupling 42
330/157 Interstage coupling 6
330/185 Input networks 4
330/192 Output networks 10
330/199 With power or bias voltage supply 51
330/1R With diverse-type art device 8
330/2 With amplifier condition indicating or testing means 305
330/207R Miscellaneous 16
330/250 With semiconductor amplifying device (e.g., transistor) 83
330/3 With plural diverse-type amplifying devices 31
330/4 With maser-type amplifying device 24
330/4.5 Parametric amplifiers 38
330/41 With gas or vapor tube amplifying device 5
330/42 With secondary electron emission tube amplifying device 12
330/43 With traveling wave-type tube 109
330/44 With electron beam tube amplifying device 43
330/47 With magnetically influenced discharge device (e.g., magnetrons) 12
330/49 With vacuum tube having distributed parameter impedance characteristics 8
330/5 With solid element wave propagating amplifying device 22
330/50 With dummy tube 3
330/51 Combined with automatic amplifier disabling switch means 1,002
330/52 With pilot frequency control means 158
330/53 With distributed parameter-type coupling means 164
330/58 With rotating dynamoelectric amplifying device 2
330/59 Having light-controlled or activated device (i.e., not light signal) 222
330/6 With hall effect type means 23
330/60 Having magnetostrictive-type amplifying device 3
330/61R With resistive-type amplifying device 10
330/63 With magnetic means amplifying device 7
330/64 With space charge grid tube 1
330/65 Involving structure other than that of transformers per se 32
330/69 Sum and difference amplifiers 469
330/7 With capacitive amplifying device 9
330/70 Anode energized through discharge path of controlled vacuum tube 7
330/75 Signal feedback 49
330/8 With saturable reactor-type amplifying device 20
330/9 With periodic switching input-output (e.g., for drift correction) 905

Patents under this class:

Patent Number Title Of Patent Date Issued

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