Our previous Fet Valve hybrid tube - mosfet preamplifier was a great sounding unit, however some of our most demanding clients hesitated because it was not the "all tube" design that they demanded.
The Fet Valve CF preamplifier resolves all concerns and provides an even higher level of performance. The solid state mos-fet followers have been replaced by pure tube devices and the circuits redesigned to take advantage of their enhanced musicality. The follower tube dual triodes are operated in parallel to provide more current output to drive lower input impedance power amplifiers.
The Fet Valve CF is all tube, using 12AT7 tubes in the gain stages and 12AU7 tubes as cathode followers. This combination, done with outstanding multiple regulated power supplies, provides the amazing dynamic range, transparency, and load drive capacity that we demand. It will interface seamlessly into and improve the most demanding audio systems.
We designed the main circuit board to take advantage of the newest high capacity power supply capacitors and specify all polypropylene capacitors in the signal paths. The full ground plane layout is very quiet and absolutely stable.
The Fet Valve CF preamplifier also includes, as a standard feature, an exquisite headphone amplifier.
AVA has long been an advocate of rock solid power supplies, and the power supply used in the Fet Valve CF is no exception. The high voltage supplies are based around an RC PI network driving six active high voltage regulators, one for each tube section. This power supply design takes supply noise and interaction down to nearly zero. In addition, there are separate regulated power supplies for the tube heaters and the headphone amplifier. Smoothing capacitors are carefully selected modern, high-reliability, high-capacity units.
The main circuit board uses multiple isolated ground planes strategically interconnected to eliminate the effects of ground currents. A very quiet custom made shielded power transformer is used. Further care was given to mitigate any possible secondary effects of interaction between power supply and audio circuit traces.
The Fet Valve CF power supply is an incredibly quiet and rock stable platform on which our audio circuits can perform their best.
The SL chassis has precision volume and balance controls, six sets of line level inputs (with one input being used for the optional phono section, if specified) and two sets of line audio outputs.
The Fet Valve CF comes standard with a high quality built in headphone amplifier.
The aluminum faceplate is finished with our incredibly durable double-anodized process. The optional premium silver faceplate is also available for this model. All input and output jacks are gold plated and a removeable IEC power cord is provided.
17" wide x 12" deep x 3.5" high