You may remember the ZeroUnoDAC and the ZeroUno PLUS looking like a small, tubed power amp, which inspired me a lot. Now, CanEVER Audio has expanded its product portfolio through offering a real power amp – the LaScala, beside which both ZeroUnos looks really dainty.
The story started at the beginning of 2017 when I met Mario Canever and Rainer Israel from CanEVER Audio during a business lunch. Back then, both presented the ZeroUno PLUS to me. During that meeting, Mario Canever mentioned that he was working on the development of a power amp as well. I commented that there are a lot of power amps out there on the market already, a view with which he agreed, but then added that he was thinking about a somewhat different type of design that wasn't the usual. The concept that he presented sounded so venturesome to me that I could hardly believe it. Now, after more than three years of development, the LaScala Power Amp is a reality and installed in my listening room.
What is so different about the LaScala Power Amp? In short: everything! First of all, one should know that Mario Canever is a brilliant electronic engineer who, although he has some really unusual ideas in mind, always respects the music to be reproduced. Based on that, Mario has no fear of contact with respect to certain electronic circuits or sorts of components. Rather he uses those guided by the technical demand. As a result, the LaScala represents a power amp in which no resistors or capacitors are present in the signal path. The signal path itself consists of six individual components only. The circuit is based on a fully-balanced push-pull design without any kind of global feedback loops, which is able to deliver 90W in Pure Class A mode. You might think that this is not possible. But Mario Canever’s answer is, "Yes, we can!" Now you might wonder how this can work at all. OK, let's have a closer look at the circuit: Right behind the XLR connector, there is a first transformer working as a phase splitter with a ratio of 1:2, producing at its output two signals of even amplitude but 180 degrees out of phase. The following two stages combine a voltage stage based on the very well accepted double triode 6N6 with the current stage based on a pair of MOSFETs running in the push-pull mode as well. So, the workload is consequently assigned: Voltage amplification based on tubes and current amplification based on transistors.
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