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
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
complementary symmetrical output that we take so much
for granted today.
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.
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