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Power IRIS is internally connectable for virtually all AC line-power
Connections systems. Units not marked otherwise, on the rear panel, are
connected for 120 Vofts, 50-60 Hz.
Two SWITCHED outlets and one UNSWITCHED outlet (U.S.
120 Volt standards) are provided on the rear panel. The
UNSWITCHED outlet is provided for powering certain me-
chanical equipment, if so recommended by its manufacturer.
The SWITCHED
outlets
can be used for all other devices up to
a total (for
all
outlets) of 580 Watts (continuous-rating).
The IRIS power switch is very rugged and can sustain the
turn-
on surge of large amplifiers. However, some audio purists
prefer to connect large power amplifiers through alternate
line-
supply arrangements to minimize any added magnetic fields in
the low-signal environment of their preamplifier.
Input IRIS employs a very low-noise, high-gain,
complementary-
Connections
symmetry phono circuit of selectable gain, derived from our
and Selection U.S. patent
4,496,910.
The phono stage output is selected by
(Phono)
the PHONOKEY and then, processed the same as other HIGH
LEVEL inputs.
The phono inputs (gold jacks) are compatible with normal
MOVING-MAGNET and HIGH-OUTPUT MOVING-COIL
cartridges (typically 2-5
mV),
and LOW-OUTPUT
MOVING-
COIL cartridges (typically
0.2-0.5
mV).
Input impedance is 47k
ohms, except when optional cartridge loading is employed.
This is discussed at the end of this manual.
The rear-panel (MM/MC) switch (next to the phono jacks), when
depressed, increases phono-stage gain by 20dB for
LOW-
OUTPUT MOVING-COIL cartridges.
CAUTION:
Never operate this switch, either way, unless the VOLUME
control is turned full down, as the very high gain present can
result in switching transients able to blow fuses in amplifiers or
loudspeakers, or damage some types of loudspeakers.
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