circuit, stage, stages, gain, circuits, noise, design, output, system, tubes, tube, configuration, input, figure, fig, operation, response, characteristics, performance, gains, applications, section, configurations, unit, systems, power, bandwidth, voltage, combination, stability, type, model, designs, impedance, saturation, distortion, chain, current, drift, types, analysis, circuitry, outputs, arrangement, module, inputs, efficiency, resistance, units, sensitivity, techniques, signal, channels, valves, detector, diagram, filter, spacing, sections, parameters, valve, network, grid, technology, chains, settings, device, frequency, modules, acts, linearity, application, length, terminals, connection, transistor, recorder, channel, speaker, requirements, biquad, triode, increases, filters, networks, components, overload

operational, differential, audio, linear, magnetic, optical, basic, ideal, pre, electronic, emitter, simple, parametric, common, single, final, typical, main, tuned, modulated, vertical, logarithmic, low, conventional, base, wave, sensitive, inverting, intermediate, doped, practical, balanced, regenerative, integrated, complete, feedback, watt, ended, horizontal, pass, negative, loop, separate, external, nonlinear, bipolar, selective, stable, ordinary, state, monolithic, distributed, suitable, hold, follower, controlled, complementary, variable, compensated, powerful, broadband, sound, uncompensated, level, transistorized, hydraulic, amp, thermionic