The Complementary Sziklai
after a prolific inventor by the name of George
C. Sziklai, this version sports a Sziklai output section,
or what is sometimes called the "Complementary Feedback
is a Sziklai?
In essence, a high gain super transistor, somewhat similar
to a Darlington. But there are major differences. Unlike Darlingtons,
there is some voltage gain with Sziklais. Another unique feature
is local feedback.
is it not as popular as EF?
Basically, more difficult to design then EF. When local
feedback is nested in a global feedback, an amplifier is more
prone to instability. In other words, it is easier to break out
into high frequency oscillations. But a well designed Sziklai
Output can often be outstanding.
This is where it probably makes a real difference. With listening
tests, the Sziklai Outputs are the most enjoyable of the three
designs. It sounds faster and the highs are smoother. This is
probably due to a wider bandwidth and faster rise time. All these
are achieved without compromising bass slam and definition. Clip
characteristics are similar to c200 (EF version), with no signs
of distortion and instability when driving 8 and 4 ohms test loads
up to rated power.
George Clifford Sziklai is credited for inventing the full
complementary symmetrical output that we take so much for
of c200.2 complementary Sziklai output
of output transistors
All THD readings were done with outputs biased to 12mV across
0.22 ohms emitter resistor. This works out to approximately 55mA
per output transistor in idling state.
| 2 | 3 | 4
| 5 | 6 | 7
Next - a 2N3055/MJ2955 version