Audio Valve Assistent 50 Integrated Amplifier
By popular request of the Audio Valve Fan Community, Audio Valve proudly presents a succession model within the Assistent series, the Assistent 50.
Here the experience of 10 years production is combined and provides the basics for a completely new technological and optical design.
We have to thank you, dear fan community, it is owed to your loyalty to the product that we at Audio Valve did not avoid expenses nor troubles to develop a new unit based on the trusted basics, which allows for your demand for "more performance and comfort".
Several reports around the globe document time and time again the excellent sound performance of the sophisticated construction of previous Assistant series.
Just like before, today power tubes type QQE are employed, but now 8 tubes – four per channel, developing full 2 x 50 Watts, reflecting a sound transparency that was and still is proverbial for this series. True to the slogan: "Once Assistent - always Assistent."
Besides all the technological innovations, especially the casing design offers several surprises. No controls on the front panel, 3D-lasered and lit writing in the amplifier’s transparent front look hardly show, what wave of innovation forms the basis of the product and will give you the expected joy for many years to come. With these features AudioValve without doubt is again trend-setting.
One of the original features of the Audio Valve products is to be found in the utilization of the valves in such a way that they operate as closely as possible to their ideal reference values each according to its type. One recalls, for instance, the output pentode-triode PCL 805 and most particularly the small beam tetrode with a common cathode QQE 3/12. This valve with a noval (nine pin) base was manufactured formerly by Valvo, Philips and Telefunken etc. (the latter was used in our test amplifier) It has a per plate power dissipation of 7,5 W and may be used with plate voltages ranging from 200 to 300 V. It is ideal in class A and AB amplifiers. This valve, according to Helmut Becker, is ideally adapted to be integrated in a circuit which includes another very innovative concept, an automatically operating grid bias control, referred to as "ABR" and used to great advantage in the integrated amplifier Assistent - 50.
The amplifying circuit uses 12 valves, but the push-pull output stages are coupled to the ABR circuit for each power tube. This exclusive Audio Valve feature, allows a comparison of the reference voltage value with that engendered by the quiescent current and which appears at the terminals of a small value resistance in the return cathode circuit. A small operation amplifier monitors, as comparator, the divergence and deliverers the compensation voltage to the grid of the valve. Each valve, young or old, reaching reference values or not is thus compensated in its Grid bias to operate at a value which corresponds to its optimal quiescent currant. A red LED diode, at the foot of each value lights up preventing the use of inadequate or defect valves. For each channel the input stage and driver stage are served by an almost known noval valve, the double triode ECC 82.
The classical chassis has been set into a caisson (a case-like frame). The valves sit in their sockets mounted on a double side printed circuit board. Little columns support the glass cover preventing dangerous hand contact burns or electric shocks could ensue conforming to the CE requirements. The cooling is achieved through the rear sides and top glass. The minimal controls mounted at the front consist of and a volume control the two channels and input selector being coupled in their operation by a remote control. At the back are the cinch input sockets, two pairs of output terminals and a mains switch and connector.
Type: Integrated stereo tube amplifier
Power: 2 x 50 watt / 8 ohm
Inputs: 1 - 5; outputs: 1 tape
Efficency: 0 dbm
Input impedance: 47 kOhm
Harmonic distortion: < 0,3% / 20 watt
Dimensions: W 420 x H 155x D 320 mm
Weight: 18 kg
Modes: ON/OFF, stand-by, mute
Functions: all be remote control
tubes: 2* ECC83, 2* ECC82, 8* QQE 03/12, RS 1029 or CV 2798
Srajan Ebaen of 6moons.com (July 2017) concluded:
"...big dense sound with rich tone, ready dynamics and powerful bass... it's not what 50 watts from pinky-finger tubes might promise but it's exactly what these delivered. It made even lean, sharp, pale or nervy recordings agreeable. Add utterly fuss-free operation and 20-year circuit maturity. Despite its slightly loud looks, the Audio Valve Assistent 50 struck me as really an ultra-conservative recommendation like blue-chip stock. That's short hand for utterly without risk. And a sure thing in hifi is a very fine thing indeed. With this my first-ever Audio Valve assignment, I felt I'd rather made a discovery..."
CLICK HERE to check out the entire review
George Sallit of HiFi-Wigwam (April 2017) wrote:
"...I put on my two sets of test tracks that show off what an amplifier can do and I got lost in the tracks and started to forget I was meant to be reviewing... And the voices. Ah yes. They are very clear, natural and made by a real 3D person not a super detailed paper cut out... On music with some real bass playing like SMV by Stanley Clarke, Marcus Miller and Victor Wootan it was possible to hear not only the different types and styles of bass playing but also the different types of bass strings. Not thump, thump, thump but a real bass guitar played by three maestros..."
CLICK HERE to check out the entire review