DESIGN PHILOSOPHY | 10 |
To maintain “Precision Bias” requires an advanced bias circuit that must have a very high degree of stability under a wide range of temperatures and load conditions. The usual bias network is of such high impedance and poor thermal regulation that at the extremes of operation, bias currents are ineffectively controlled. Advanced tracking techniques results in absolute control of bias curents under all conditions in the Amplifier 11.5.
The main power supply of the amplifier consists of a 2000VA toroidal power transformer with independent rectifiers to isolate the channels from one another. One hundred thousand microfarads of total capacitance provide effective filtering.
The above attributes result in a amplifier of such extreme linearity and bandwidth that no overall feedback correction is required or used. One advantage of this is a high degree of immunity from interactions with loads or cables and a superior transient response. An extremely low nonreactive output impedance is maintained well beyond 20,000 hz. The resulting uniform damping factor is not usually found in other designs.
The Amplifier 11.5 has all structural parts made of machined aluminum which are milled to very close tolerances yielding the seemless appearance characteristic of previous products from Coda. As with all Class A amplifiers, heat dissipation is important. The Amplifier 11.5 uses six massive heat sinks for efficient, noiseless, and clean thermal relief. The thermal coefficient of the heat sinks is one of the lowest and most effective in the audio industry.
