PHONO 1 Channel: This channel is equalized for use with magnetic phono-
graph cartridges. A level control is provided at the rear panel to allow use of
cartridges with output voltage ranging from 3 MV to 70 MV. The termination of
this channel is 100K which is recommended by several cartridge manufacturers.
If a lower termination is desired, a resistor may be placed across the input.
PHONO 2 Channel: This channel is the same as phono 1 channel except
that a variable load control has been added. The control is calibrated from 6. 8K
to 52K and any termination in this range may be selected. In addition, this load
control has a switch attached which operates in the counter-clockwise position.
This position is labeled "FM". When the load control is placed in this position,
any constant amplitude type cartridge (ceramic, crystal, FM type) may be used,
allowing full use of the flexible equalization available. The level control is also
effective on these cartridges.
All controls are effective on the PHONO channels.
The Compensation switch may be used to compensate recordings as recom-
mended by the manufacturer or to adjust the compensation for a more pleasing
tonal balance for the listener. The Bass and Treble tone controls are indepen-
dent of the compensation switch and may be used as fine adjustments in conjunc-
tion with this switch.
The five position channel Selector switch may be used to select any of the
five input channels available.
The Volume control selects the desired listening level and since it is
located at the output of the Audio Compensator, the high signal to noise ratio of
the unit is maintained at all levels. By properly adjusting the input potentiom-
eters on all channels, the volume level can be held equal for all channels; the
signal will remain at a constant loudness when switching from one channel to
another. The master off-on switch is attached to the volume control. This
switch controls the three auxiliary A.C. outlets on the rear panel of the Audio
Compensator, as well as the three auxiliary A.C. outlets on the power supply
of the C-4P.
GUARANTEE
We guarantee the performance of this equipment and the mechanical and
electrical workmanship to be free of serious defects for a period of 90 days.
This guarantee does not extend to components damaged by improper use nor does
it extend to transportation to and from the factory.
McINTOSH LABORATORY INC.
320 Water Street
Binghamton, N. Y., U.S.A.
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