When we speak about A Class audio we refer to an amplifier who has output power stage working (biased) at full conduction till max power output, working without any switching, variable biasing or other devices who could decreases its special audio accomplishment.
Such amplifiers could be easy recognized for the power supply drain to be fixed, the same as idle or at full power output. 

1. - Power Supply.
   It has been designed to work for continous and fixed power (250W), so we oversized it, being capable of suppling (@12V battery) more than 500 W of regulated and clean DC power ready to be used in very short time. It works at a frequency higher than the standard one, to make it more compact, light, insensible to voltage variations ofvehicle, making useless even for this model the presence of large and expensive battery capacitors.
    
2. - Preamplifier.
   CLASSE A35 makes use of the same fet circuital design of VA2150; this preamp can do everything it has been designed for: extreme sound trasparency... as it does not exist!
    
3. Amplifier.
   It can boast the same inusual circuital solution of VA2150, wich use in Car environment has never been tried before; COMPLETE SEPARATION OF THE SPEAKERS FROM AMPLIFICATION CIRCUIT [Total feedback= 0]. In short, this means an extreme control of speakers drived on outputs, with a realism, a speed and precision in the microdetail really exciting.
4. Output stage.
   it is capable of 35Wrms with full A CLASS till clipping, giving out a delicate sound  compared only to the best home A Class high-end amps
5. Protection circuit.
   CLASSE A 35 has simple protection circuit but at the same time intended not to interfere at all with the big and very fast current drive of the speakers (10 Arms peak in less than 1µS). The heat-sink system deserves a separate mention: it is studied to assure a full power running even in conditions of poor ventilation (unfortunately very frequent), avoiding incidental and premature shutdown.