Abstract:
A passive circuit that provides a variable means of controlling the audio speaker's volume level from a music instrument tube amplifier, without reducing the reactance of the audio speaker, allowing the audio speaker to reproduce sound in a natural way. The invention utilizes a multiple tapped input and a multiple tapped output transformers, along with a multiple tapped series resistive network, providing volume level control without reducing the audio speaker's reactance with a parallel resistive load. The input transformer with multiple taps, provides a variable means to impedance match the circuit to a plurality of impedance values available in common music instrument tube amplifiers. The separate output transformer with multiple taps, provides a variable means to impedance match the circuit to a plurality of impedance values available in common audio speakers. By utilizing the individual multiple tapped input and output transformers, the invention provides a means of converting the output impedance of the music instrument tube amplifier and separately converting an audio speaker with a dissimilar impedance value, to match the impedance requirements of the volume control circuit.