| Class 330 | AMPLIFIERS |
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![[List of Pre Grant Publications for class 330 subclass 1R]](../as.gif) | ![[List of Patents for class 330 subclass 1R]](../ps.gif) | 1R | WITH DIVERSE-TYPE ART DEVICE |
| | 2 | WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS |
| | 3 | WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES |
| | 4 | WITH MASER-TYPE AMPLIFYING DEVICE |
| | 4.5 | PARAMETRIC AMPLIFIERS |
| | 4.6 |  Traveling wave type |
| | 4.8 | Gyromagnetic type (e.g., ferrite) |
| | 4.9 | Semiconductor type (e.g., with semiconductor diode) |
| | 5 | WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE |
| | 6 | WITH HALL EFFECT TYPE MEANS |
| | 7 | WITH CAPACITIVE AMPLIFYING DEVICE |
| | 8 | WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE |
| | 9 | WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION) |
| | 10 | MODULATOR-DEMODULATOR-TYPE AMPLIFIER |
| | 11 | WITH D.C. REINSERTION CIRCUIT |
| | 250 | WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) |
| | 251 | Including Class D amplifier |
| | 252 | Including differential amplifier |
| | 253 |  Having field effect transistor |
| | 254 | Having gain control means |
| | 255 | Having push-pull amplifier stage |
| | 256 | Having temperature compensation means |
| | 257 | Having current mirror amplifier |
| | 258 | Having common mode rejection circuit |
| | 259 | Having D.C. feedback bias control for stabilization |
| | 260 | Having signal feedback means |
| | 261 | Having particular biasing arrangement |
| | 262 | Including push-pull amplifier |
| | 263 | Having complementary symmetry |
| | 264 |  And field effect transistor |
| | 265 | And feedback means |
| | 266 | And temperature compensation |
| | 267 | And particular biasing arrangement |
| | 269 | Having field effect transistor |
| | 270 | Having D.C. feedback bias control for stabilization |
| | 271 | Having signal feedback means |
| | 272 | Having temperature compensating means |
| | 273 | Having particular biasing arrangement |
| | 275 | Having balanced to unbalanced circuitry and vice versa |
| | 276 | Having transformer |
| | 277 | Including field effect transistor |
| | 278 | Including gain control means |
| | 279 | And significant control voltage developing means |
| | 282 | Having feedback means acting as variable impedance |
| | 284 | Having attenuation means in signal transmission path |
| | 285 | Having particular biasing means |
| | 286 | Including distributed parameter-type coupling |
| | 288 | Including current mirror amplifier |
| | 289 | Including temperature compensation means |
| | 290 | Including D.C. feedback bias control for stabilization |
| | 291 | Including signal feedback means |
| | 292 | Having compensation for interelectrode impedance |
| | 293 | Having negative feedback |
| | 294 | Having frequency-responsive means or phase-shift means in feedback path |
| | 295 | Including plural amplifier channels |
| | 296 | Including particular biasing arrangement |
| | 297 | Including particular power supply circuitry |
| | 298 | Including protection means |
| | 299 | Including combined diverse-type semiconductor device |
| | 301 | Including balanced to unbalanced circuits and vice versa |
| | 302 | Including frequency-responsive means in the signal transmission path |
| | 303 | Including an active device in the filter means |
| | 304 | And equalizing means |
| | 305 | And tuning means |
| | 306 | And bandpass, broadband (e.g., wideband) or sidepass means |
| | 307 | Integrated circuits |
| | 308 | Including atomic particle or radiant energy impinging on a semiconductor |
| | 309 | Involving structure of three diverse function electrode type |
| | 310 | Including plural stages cascaded |
| | 41 | WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE |
| | 42 | WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE |
| | 43 | WITH TRAVELING WAVE-TYPE TUBE |
| | 44 | WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE |
| | 47 | WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS) |
| | 49 | WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS |
| | 50 | WITH DUMMY TUBE |
| | 51 | COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS |
| | 52 | WITH PILOT FREQUENCY CONTROL MEANS |
| | 53 | WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS |
| | 54 | Distributed amplifier |
| | 55 | Push-pull |
| | 56 | Waveguide, cavity, or concentric line resonator |
| | 57 | Artificial line |
| | 58 | WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE |
| | 59 | HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL) |
| | 60 | HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE |
| | 61R | WITH RESISTIVE-TYPE AMPLIFYING DEVICE |
| | 63 | WITH MAGNETIC MEANS AMPLIFYING DEVICE |
| | 64 | WITH SPACE CHARGE GRID TUBE |
| | 65 | INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE |
| | 69 | SUM AND DIFFERENCE AMPLIFIERS |
| | 70 | ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE |
| | 71 | Plural discharge paths traversed by anode supply |
| | 73 | Plural outputs |
| | 74 | Separate signal inputs to series devices |
| | 75 | SIGNAL FEEDBACK |
| | 76 | Compensating for inter-electrode impedance (e.g., neutralization) |
| | 77 | At least one push-pull stage |
| | 78 | To or from electrode common to input and output |
| | 79 | By transformer feedback |
| | 80 | By coil in parallel to and resonating with inter-electrode capacity |
| | 81 | At least one push-pull signal stage |
| | 84 | Plural amplifier channels |
| | 85 | Amplifier in signal feedback path |
| | 86 | Variable impedance in feedback path varied by separate control path |
| | 87 | Cathode impedance feedback |
| | 88 | Cascade amplifier stages with cathode-cathode feedback |
| | 90 | Combined with diverse-type feedback coupling |
| | 94 | Frequency responsive means in cathode impedance feedback path |
| | 95 | Nonlinear impedance means in cathode impedance feedback path |
| | 96 | Combined with control of bias voltage of signal amplifier |
| | 97 | Including D.C. path for signal feedback |
| | 98 | In cascade amplifiers |
| | 101 | Positive and negative feedback in same path at different frequencies |
| | 102 | Current and voltage feedback |
| | 103 | Multiple feedback paths |
| | 105 | From impedance in series with output load (e.g., current feedback) |
| | 106 | In series with input source |
| | 107 | Phase shift means in loop path |
| | 108 | Potentiometer common to signal and feedback path |
| | 109 | Frequency responsive feedback means |
| | 110 | Nonlinear impedance element in loop path |
| | 111 | To or from an auxiliary grid or to the anode |
| | 112 | Positive feedback |
| | 113 | POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT) |
| | 114 | UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER) |
| | 116 | WITH BALANCED-TO-UNBALANCED COUPLING |
| | 117 | WITH UNBALANCED-TO-BALANCED COUPLING |
| | 118 | INCLUDING A PUSH-PULL STAGE |
| | 119 | Coupling to or from cathode in push-pull |
| | 120 | Interstage coupling between push-pull |
| | 122 | Input and/or output coupling for push-pull |
| | 123 | Power or bias supply circuits and control thereof |
| | 124R | WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS) |
| | 125 | D.C. and A.C. amplifier channels |
| | 126 | Amplifying different frequencies in different channels |
| | 124D | Redundant amplifier circuits |
| | 127 | WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE |
| | 128 | Control means for anode of screen grid circuit |
| | 129 | With control of input electrode or gain control electrode bias |
| | 130 | Bias controlled by separate external control source |
| | 131 | Control of bias on separate gain control electrode |
| | 132 | Frequency selective means to select control signal from amplifier channel |
| | 133 | Different bias control means for different stages of cascade amplifier |
| | 134 | Plural different bias control voltages provided by separate means |
| | 135 | Amplitude limiting or bias voltage |
| | 136 | Bias control signal from input of amplifier |
| | 137 | Oscillator supplies or controls bias |
| | 138 | Bias controlled by biased rectifier or discharge device |
| | 139 | Electronic tube controls bias |
| | 140 | Rectifier in bias control circuit |
| | 141 | Time constant circuit in bias control circuit |
| | 142 | Cathode resistor supplies bias (e.g., self-biasing circuits) |
| | 143 | THERMALLY RESPONSIVE IMPEDANCE |
| | 144 | VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH |
| | 146 | WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM |
| | 147 | PLURAL SIGNAL INPUTS |
| | 148 | PLURAL SIGNAL OUTPUTS |
| | 149 | HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL |
| | 150 | CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS |
| | 151 | WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED) |
| | 152 | CASCADED DIFFERENTLY COUPLED BETWEEN STAGES |
| | 153 | Including a cathode follower stage |
| | 154 | Transformer or resonant circuit in interstage coupling (e.g., stagger tuning) |
| | 155 | UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH |
| | 156 | BOOTSTRAP COUPLING |
| | 157 | INTERSTAGE COUPLING |
| | 158 | Coupling to cathode |
| | 160 | Coupling to plate or auxiliary grid |
| | 162 | Output coupling from grid |
| | 164 | With electronic tube or diode in coupling circuit |
| | 165 | Transformer coupling |
| | 166 | With additional reactive coupling |
| | 167 | With additional impedance connected to "P" or "S" circuits |
| | 168 | From cathode |
| | 169 | With means for adjusting inductive coupling |
| | 170 | With shielding |
| | 171 | With transformer structure |
| | 172 | Coupling from cathode |
| | 174 | With electromechanical transducer (e.g., piezoelectric crystal) |
| | 175 | With lattice or Wheatstone bridge network in coupling circuits |
| | 176 | With T, H, or Pi network in coupling circuit |
| | 177 | With coupling or blocking capacitor |
| | 178 | With R or L in series between stages |
| | 179 | L in anode or grid circuit |
| | 180 | With R in anode and grid circuit (RC coupling) |
| | 181 | D.C. coupled |
| | 185 | INPUT NETWORKS |
| | 192 | OUTPUT NETWORKS |
| | 199 | WITH POWER OR BIAS VOLTAGE SUPPLY |
| | 207R | MISCELLANEOUS |
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