Class   330	AMPLIFIERS
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1R

WITH DIVERSE-TYPE ART DEVICE

1A

. (1 indent ) With process control system

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

. (1 indent ) Traveling wave type

4.7

.. (2 indent ) Electron beam device

4.8

. (1 indent ) Gyromagnetic type (e.g., ferrite)

4.9

. (1 indent ) Semiconductor type (e.g., with semiconductor diode)

5

WITH SOLID ELEMENT WAVE PROPAGATING AMPLIFYING DEVICE

5.5

. (1 indent ) Phonon type (e.g., ultrasonic wave propagating 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

. (1 indent ) Including Class D amplifier

252

. (1 indent ) Including differential amplifier

253

.. (2 indent ) Having field effect transistor

254

.. (2 indent ) Having gain control means

255

.. (2 indent ) Having push-pull amplifier stage

256

.. (2 indent ) Having temperature compensation means

257

.. (2 indent ) Having current mirror amplifier

258

.. (2 indent ) Having common mode rejection circuit

259

.. (2 indent ) Having D.C. feedback bias control for stabilization

260

.. (2 indent ) Having signal feedback means

261

.. (2 indent ) Having particular biasing arrangement

262

. (1 indent ) Including push-pull amplifier

263

.. (2 indent ) Having complementary symmetry

264

... (3 indent ) And field effect transistor

265

... (3 indent ) And feedback means

266

... (3 indent ) And temperature compensation

267

... (3 indent ) And particular biasing arrangement

268

.... (4 indent ) To eliminate crossover distortion

269

.. (2 indent ) Having field effect transistor

270

.. (2 indent ) Having D.C. feedback bias control for stabilization

271

.. (2 indent ) Having signal feedback means

272

.. (2 indent ) Having temperature compensating means

273

.. (2 indent ) Having particular biasing arrangement

274

... (3 indent ) To eliminate crossover distortion

275

.. (2 indent ) Having balanced to unbalanced circuitry and vice versa

276

.. (2 indent ) Having transformer

277

. (1 indent ) Including field effect transistor

278

. (1 indent ) Including gain control means

279

.. (2 indent ) And significant control voltage developing means

280

... (3 indent ) With delay means

281

... (3 indent ) With time constant means

282

.. (2 indent ) Having feedback means acting as variable impedance

283

... (3 indent ) Having emitter degeneration

284

.. (2 indent ) Having attenuation means in signal transmission path

285

.. (2 indent ) Having particular biasing means

286

. (1 indent ) Including distributed parameter-type coupling

287

.. (2 indent ) Of diode type

288

. (1 indent ) Including current mirror amplifier

289

. (1 indent ) Including temperature compensation means

290

. (1 indent ) Including D.C. feedback bias control for stabilization

291

. (1 indent ) Including signal feedback means

292

.. (2 indent ) Having compensation for interelectrode impedance

293

.. (2 indent ) Having negative feedback

294

.. (2 indent ) Having frequency-responsive means or phase-shift means in feedback path

295

. (1 indent ) Including plural amplifier channels

296

. (1 indent ) Including particular biasing arrangement

297

. (1 indent ) Including particular power supply circuitry

298

. (1 indent ) Including protection means

299

. (1 indent ) Including combined diverse-type semiconductor device

300

.. (2 indent ) Bipolar or unipolar (FET)

301

. (1 indent ) Including balanced to unbalanced circuits and vice versa

302

. (1 indent ) Including frequency-responsive means in the signal transmission path

303

.. (2 indent ) Including an active device in the filter means

304

.. (2 indent ) And equalizing means

305

.. (2 indent ) And tuning means

306

.. (2 indent ) And bandpass, broadband (e.g., wideband) or sidepass means

307

. (1 indent ) Integrated circuits

308

. (1 indent ) Including atomic particle or radiant energy impinging on a semiconductor

309

. (1 indent ) Involving structure of three diverse function electrode type

310

. (1 indent ) Including plural stages cascaded

311

.. (2 indent ) Having different configurations

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

45

. (1 indent ) Having electrode coupled to cavity resonator

46

. (1 indent ) Having deflecting means

47

WITH MAGNETICALLY INFLUENCED DISCHARGE DEVICE (E.G., MAGNETRONS)

48

. (1 indent ) Having signal applied to magnetic means

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

. (1 indent ) Distributed amplifier

55

. (1 indent ) Push-pull

56

. (1 indent ) Waveguide, cavity, or concentric line resonator

57

. (1 indent ) 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

62

. (1 indent ) Magnetoresistive type

61A

. (1 indent ) Negative resistance amplifiers

63

WITH MAGNETIC MEANS AMPLIFYING DEVICE

64

WITH SPACE CHARGE GRID TUBE

65

INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE

66

. (1 indent ) With printed circuits

67

. (1 indent ) With capacitive structure

68

. (1 indent ) With shielding means

69

SUM AND DIFFERENCE AMPLIFIERS

70

ANODE ENERGIZED THROUGH DISCHARGE PATH OF CONTROLLED VACUUM TUBE

71

. (1 indent ) Plural discharge paths traversed by anode supply

72

.. (2 indent ) Amplifier devices in arms of a bridge

73

. (1 indent ) Plural outputs

74

. (1 indent ) Separate signal inputs to series devices

75

SIGNAL FEEDBACK

76

. (1 indent ) Compensating for inter-electrode impedance (e.g., neutralization)

77

.. (2 indent ) At least one push-pull stage

78

.. (2 indent ) To or from electrode common to input and output

79

.. (2 indent ) By transformer feedback

80

.. (2 indent ) By coil in parallel to and resonating with inter-electrode capacity

81

. (1 indent ) At least one push-pull signal stage

82

.. (2 indent ) Positive and negative feedback

83

.. (2 indent ) Including D.C. path for signal feedback

84

. (1 indent ) Plural amplifier channels

85

. (1 indent ) Amplifier in signal feedback path

86

. (1 indent ) Variable impedance in feedback path varied by separate control path

87

. (1 indent ) Cathode impedance feedback

88

.. (2 indent ) Cascade amplifier stages with cathode-cathode feedback

89

... (3 indent ) Between adjacent stages

90

.. (2 indent ) Combined with diverse-type feedback coupling

91

... (3 indent ) Diverse feedback to or from cathode

92

.... (4 indent ) Feedback to cathode impedance of a prior stage

93

... (3 indent ) Including positive feedback

94

.. (2 indent ) Frequency responsive means in cathode impedance feedback path

95

.. (2 indent ) Nonlinear impedance means in cathode impedance feedback path

96

. (1 indent ) Combined with control of bias voltage of signal amplifier

97

. (1 indent ) Including D.C. path for signal feedback

98

. (1 indent ) In cascade amplifiers

99

.. (2 indent ) Multiple feedback

100

... (3 indent ) A feedback to input of a prior stage

101

. (1 indent ) Positive and negative feedback in same path at different frequencies

102

. (1 indent ) Current and voltage feedback

103

. (1 indent ) Multiple feedback paths

104

.. (2 indent ) Positive and negative feedback

105

. (1 indent ) From impedance in series with output load (e.g., current feedback)

106

. (1 indent ) In series with input source

107

. (1 indent ) Phase shift means in loop path

108

. (1 indent ) Potentiometer common to signal and feedback path

109

. (1 indent ) Frequency responsive feedback means

110

. (1 indent ) Nonlinear impedance element in loop path

111

. (1 indent ) To or from an auxiliary grid or to the anode

112

. (1 indent ) 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)

115

. (1 indent ) Applied to filamentary cathode

116

WITH BALANCED-TO-UNBALANCED COUPLING

117

WITH UNBALANCED-TO-BALANCED COUPLING

118

INCLUDING A PUSH-PULL STAGE

119

. (1 indent ) Coupling to or from cathode in push-pull

120

. (1 indent ) Interstage coupling between push-pull

121

.. (2 indent ) D.C. coupling

122

. (1 indent ) Input and/or output coupling for push-pull

123

. (1 indent ) Power or bias supply circuits and control thereof

124R

WITH PLURAL AMPLIFIER CHANNELS (E.G., PARALLEL AMPLIFIER CHANNELS)

125

. (1 indent ) D.C. and A.C. amplifier channels

126

. (1 indent ) Amplifying different frequencies in different channels

124D

. (1 indent ) Redundant amplifier circuits

127

WITH CONTROL OF POWER SUPPLY OR BIAS VOLTAGE

128

. (1 indent ) Control means for anode of screen grid circuit

129

. (1 indent ) With control of input electrode or gain control electrode bias

130

.. (2 indent ) Bias controlled by separate external control source

131

.. (2 indent ) Control of bias on separate gain control electrode

132

.. (2 indent ) Frequency selective means to select control signal from amplifier channel

133

.. (2 indent ) Different bias control means for different stages of cascade amplifier

134

.. (2 indent ) Plural different bias control voltages provided by separate means

135

.. (2 indent ) Amplitude limiting or bias voltage

136

.. (2 indent ) Bias control signal from input of amplifier

137

.. (2 indent ) Oscillator supplies or controls bias

138

.. (2 indent ) Bias controlled by biased rectifier or discharge device

139

.. (2 indent ) Electronic tube controls bias

140

.. (2 indent ) Rectifier in bias control circuit

141

.. (2 indent ) Time constant circuit in bias control circuit

142

.. (2 indent ) Cathode resistor supplies bias (e.g., self-biasing circuits)

143

THERMALLY RESPONSIVE IMPEDANCE

144

VARIABLE IMPEDANCE FOR SIGNAL CHANNEL CONTROLLED BY SEPARATE CONTROL PATH

145

. (1 indent ) Electron tube or diode as impedance

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

. (1 indent ) Including a cathode follower stage

154

. (1 indent ) 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

. (1 indent ) Coupling to cathode

159

.. (2 indent ) D.C. coupling

160

. (1 indent ) Coupling to plate or auxiliary grid

161

.. (2 indent ) D.C. coupling

162

. (1 indent ) Output coupling from grid

163

.. (2 indent ) D.C. coupling

164

. (1 indent ) With electronic tube or diode in coupling circuit

165

. (1 indent ) Transformer coupling

166

.. (2 indent ) With additional reactive coupling

167

.. (2 indent ) With additional impedance connected to "P" or "S" circuits

168

.. (2 indent ) From cathode

169

.. (2 indent ) With means for adjusting inductive coupling

170

.. (2 indent ) With shielding

171

.. (2 indent ) With transformer structure

172

. (1 indent ) Coupling from cathode

173

.. (2 indent ) D.C. coupling

174

. (1 indent ) With electromechanical transducer (e.g., piezoelectric crystal)

175

. (1 indent ) With lattice or Wheatstone bridge network in coupling circuits

176

. (1 indent ) With T, H, or Pi network in coupling circuit

177

. (1 indent ) With coupling or blocking capacitor

178

.. (2 indent ) With R or L in series between stages

179

.. (2 indent ) L in anode or grid circuit

180

.. (2 indent ) With R in anode and grid circuit (RC coupling)

181

. (1 indent ) D.C. coupled

182

.. (2 indent ) With series reactive element between stages

183

.. (2 indent ) With nonlinear device

184

.. (2 indent ) With series resistance between stages

185

INPUT NETWORKS

186

. (1 indent ) To cathode

187

.. (2 indent ) D.C. coupled

188

. (1 indent ) Transformer coupled

189

.. (2 indent ) With additional impedance connected to "P" or "S" circuits

190

.. (2 indent ) With transformer structure

191

. (1 indent ) D.C. coupled

192

OUTPUT NETWORKS

193

. (1 indent ) From cathode

194

.. (2 indent ) D.C. coupled

195

. (1 indent ) Transformer coupled

196

.. (2 indent ) With additional impedance connected to "P" or "S" circuit

197

.. (2 indent ) With transformer structure

198

. (1 indent ) D.C. coupled

199

WITH POWER OR BIAS VOLTAGE SUPPLY

200

. (1 indent ) For plural stage amplifier

201

.. (2 indent ) Filamentary cathodes heated by anode current or anode supply source

202

. (1 indent ) For anode

203

.. (2 indent ) And input electrode

204

. (1 indent ) For input electrode

205

.. (2 indent ) And filamentary cathode

206

. (1 indent ) For filamentary cathode

207R

MISCELLANEOUS

207A

. (1 indent ) Class D

207P

. (1 indent ) Amplifier protection means

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