Patent ID: 9484869
Filing Date: 2016-11-01
CPC Classification: H03F,Y10T

Claim Text:
1. A preamplifier stage module circuit comprising: an anode section, a grid section, a cathode section, an attenuator section, and a tube connected with the anode, grid, cathode, and attenuator sections; the preamplifier stage module circuit selectively configurable to provide an output signal having any one of a plurality of selectable voices, each voice provided by a corresponding combination of selectively combinable voice components of the anode, grid, cathode, and attenuator sections, the voice components selectively connectable to the tube anode, grid and cathode to provide a selected one of the voices by (a) biasing the tube to produce, from an input signal to the preamplifier stage module circuit that includes the tube, a signal having a harmonic spectrum and gain that are specific to the preamplifier stage module circuit and specific to the selected voice, and (b) shaping the harmonic spectrum and gain to provide the selected voice in the output signal from the preamplifier stage module circuit.