tube amplifiers built by Joaquim Pinto had origin in a challenge
that was given to him by a friend - who knew Pinto’s technical
skills and had already requested several repairs of audio devices.
The challenge consisted in creating a tube amplifier, from scratch,
that followed performance requirements that led to his auditory
sensibility e that were technically measurable.
The challenge consisted in building the amplifier using techniques
used in the 50’s-60’s – in what concerns the
audio circuit itself – through the welding point to point
method and thus repudiating any circuit printed in the sign