2
Design Innovation
The Rega Ios is a four stage all symmetrical amplifier. To
provide optimum performance it is dedicated to amplifying the
very low level signals that are generated by moving coil
cartridges.
The first stage uses a 1:10 step-up transformer, which can be
optimised to the cartridge by the selection of the correct
loading and zobel DC resistance correction network connected
across the MC transformer secondary.
The second stage is symmetrical compound pair class A
amplifier, using paralleled low noise Hitachi transistors in the
input stage. This drives the passive high frequency part of the
RIAA equalisation stage.
The third stage is a symmetrical class A differential amplifier
with a common base driver stage; this is also used as the
active amplifier in the low frequency part of the RIAA
equalisation stage.
The fourth stage is the active filter, this configuration uses the
same circuit as found in the second stage. The filter element
uses a very high bandwidth operational amplifier gyrator as the
simulated inductance part of the tuned filter.
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