Stereo solid-state hi-fi integrated amplifier AudioValve AudioValve Assistent 30 black

Overview

At the popular request of the Audio Valve fan community, Audio Valve proudly presents a successor model within the Assistent series (following a previous legend Assistent 10/20) the Assistent 30. Numerous reports around the world have documented time and time again the excellent sound performance of the sophisticated construction of the previous Assistent series. We must thank you, dear fan community, it is thanks to your product loyalty that we at Audio Valve have spared no expense or trouble to develop a new unit based on the trusted foundations, which allows us to meet your demand for “more performance” and comfort”.

One of the original features of Audio Valve products lies in the use of valves in such a way that they operate as close as possible to their ideal reference values according to their type. We recall for example the pentode-triode PCL 805 output and especially the common cathode small beam tetrode QQE 3/12. This valve with a noval base (nine pins) was previously manufactured by Valvo, Philips and Telefunken and SIEMENS etc. (the latter was used in our test amplifier) It has a plate power dissipation of 7.5 W and can be used with plate voltages ranging from 200 to 300 V. This valve, according to Helmut Becker, is ideally suited to be integrated into a circuit which includes another very innovative concept, an automatic operating grid bias control, called “ABR”

The amplification circuit uses 12 valves, but the push-pull output stages are coupled to the unique and special ABR circuit for each power tube. This exclusive Audio Valve function allows a comparison of the reference voltage value with that generated by the quiescent current and which appears across a low value resistor in the cathode return circuit. A small operating amplifier monitors, as a comparator, the divergence and provides the compensation voltage to the valve grid. Each valve, young or old, reaching or not reaching reference values is thus compensated in its grid bias to operate at a value which corresponds to its optimal quiescent current. A bright red LED, at the foot of each value lights up preventing the use of inadequate or defective valves.

The classic chassis has been installed in a cabinet (a box-shaped frame). The valves rest in their sockets mounted on a double-sided printed circuit board. Small columns support the glass cover preventing contact burns with dangerous hands or electric shocks could result in compliance with CE requirements. Cooling is achieved through the rear sides and the top glass. The minimal controls mounted on the front consist of a volume control for both channels and an input selector coupled in their operation by a remote control. At the rear are the Cinch input sockets, two pairs of output terminals and the main connector with the main power fuse.

Technical specifications