Abstract: Circuitry is provided for simulating and emulating the sounds of a loudspeaker driven by a classic rock and roll guitar amplifier in the form of an electrical signal which, when input to a recording console or used to drive high fidelity headphones or a high quality monitor amplifier and monitor loudspeaker, accurately reproduces such sounds. The circuitry is incorporated at the output of a classic tube-type rock and roll guitar amplifier, and consists of three basic modules: a load impedance module (FIG. 3) designed to offer to the tube amplifier output a load impedance as a function of frequency (FIG. 1) which is modeled after and nearly identical (in both real and imaginary components) to the impedance of a classic rock and roll guitar speaker; a highpass filter circuit (24) which emulates the low frequency resonance and rolloff characteristics (FIG.

Abstract: A high density headplate (12) made of brass or other metal is secured between a stringed instrument's headstock (10) and its tuning machine (20). This both increases the angle (A) of the string (14) at the nut (16) and effectively increases the density of the headstock which results in a noticeable increase in sustain as well as an improvement in the perceived frequency response of the instrument.