| | CLASS NOTES |
1 R | DF | WITH DIVERSE-TYPE ART DEVICE {1} |
2 | DF | WITH AMPLIFIER CONDITION INDICATING OR TESTING MEANS |
3 | DF | WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES |
4 | DF | WITH MASER-TYPE AMPLIFYING DEVICE |
4.5 | DF | PARAMETRIC AMPLIFIERS {3} |
5 | DF | WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE {1} |
6 | DF | WITH HALL EFFECT TYPE MEANS |
7 | DF | WITH CAPACITIVE AMPLIFYING DEVICE |
8 | DF | WITH SATURABLE REACTOR-TYPE AMPLIFYING DEVICE |
9 | DF | WITH PERIODIC SWITCHING INPUT-OUTPUT (E.G., FOR DRIFT CORRECTION) |
10 | DF | MODULATOR-DEMODULATOR-TYPE AMPLIFIER |
11 | DF | WITH D.C. REINSERTION CIRCUIT |
250 | DF | WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21} |
41 | DF | WITH GAS OR VAPOR TUBE AMPLIFYING DEVICE |
42 | DF | WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE |
43 | DF | WITH TRAVELING WAVE-TYPE TUBE |
44 | DF | WITH ELECTRON BEAM TUBE AMPLIFYING DEVICE {2} |
47 | DF | WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS) {1} |
49 | DF | WITH VACUUM TUBE HAVING DISTRIBUTED PARAMETER IMPEDANCE CHARACTERISTICS |
50 | DF | WITH DUMMY TUBE |
51 | DF | COMBINED WITH AUTOMATIC AMPLIFIER DISABLING SWITCH MEANS |
52 | DF | WITH PILOT FREQUENCY CONTROL MEANS |
53 | DF | WITH DISTRIBUTED PARAMETER-TYPE COUPLING MEANS {4} |
58 | DF | WITH ROTATING DYNAMOELECTRIC AMPLIFYING DEVICE |
59 | DF | HAVING LIGHT-CONTROLLED OR ACTIVATED DEVICE (I.E., NOT LIGHT SIGNAL) |
60 | DF | HAVING MAGNETOSTRICTIVE-TYPE AMPLIFYING DEVICE |
61 R | DF | WITH RESISTIVE-TYPE AMPLIFYING DEVICE {2} |
63 | DF | WITH MAGNETIC MEANS AMPLIFYING DEVICE |
64 | DF | WITH SPACE CHARGE GRID TUBE |
65 | DF | INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE {3} |
69 | DF | SUM AND DIFFERENCE AMPLIFIERS |
70 | DF | ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE {3} |
75 | DF | SIGNAL FEEDBACK {20} |
113 | DF | POLYPHASE POWER SUPPLY (I.E., FOR AN ELECTRODE, CATHODE HEATER, OR FILAMENT) |
114 | DF | UNRECTIFIED A.C. POWER SUPPLY FOR AN ELECTRODE (I.E., NOT THE HEATER) {1} |
116 | DF | WITH BALANCED-TO-UNBALANCED COUPLING |
117 | DF | WITH UNBALANCED-TO-BALANCED COUPLING |
118 | DF | INCLUDING A PUSH-PULL STAGE {4} |
124 R | DF | WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS) {3} |
127 | DF | WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE {2} |
143 | DF | THERMALLY RESPONSIVE IMPEDANCE |
144 | DF | VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH {1} |
146 | DF | WHEATSTONE BRIDGE WITH AMPLIFIER IN AT LEAST ONE ARM |
147 | DF | PLURAL SIGNAL INPUTS |
148 | DF | PLURAL SIGNAL OUTPUTS |
149 | DF | HUM OR NOISE OR DISTORTION BUCKING INTRODUCED INTO SIGNAL CHANNEL |
150 | DF | CASCADED SIMILAR AMPLIFYING DEVICE OF DIFFERENT CHARACTERISTICS |
151 | DF | WITH AMPLIFIER BYPASS MEANS (E.G., FORWARD FEED) |
152 | DF | CASCADED DIFFERENTLY COUPLED BETWEEN STAGES {2} |
155 | DF | UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH |
156 | DF | BOOTSTRAP COUPLING |
157 | DF | INTERSTAGE COUPLING {11} |
185 | DF | INPUT NETWORKS {3} |
192 | DF | OUTPUT NETWORKS {3} |
199 | DF | WITH POWER OR BIAS VOLTAGE SUPPLY {4} |
207 R | DF | MISCELLANEOUS {2} |