PLINIUS M7 Instruction Manual Page 1
INTRODUCTION
The
PLINIUS
M7 Preamplifier is a continuation of the design philosophy embodies in
the Model 12 Preamplifier. It represents another step in this new direction for Plinius
amplification.
One major departure from previous models is the use of an “onboard” power supply.
This supply consists of a pcb mounted transformer and a tightly regulated power
regulation system.
The phono stage consists of a FET amplifier without overall feedback, in a design
similar to a tube circuit, followed by the high frequency equalisation. This in turn is
followed by an active feedback low frequency stage.
Although the M7 is able to provide superb results from a phono based system, the high
level circuits have been optimised for CD and other popular sources.
Every component used within the M7 has been chosen for sonic excellence. The
potentiometers used are quality ALPS units and all switching is done directly on the
circuit board. Tape selection is by solid stage analogue switches.
CONTROLS
The volume control is a high quality close tolerance type and will accurately convey
the source signals to the high level amplification stages. It should be set between 10
o’clock and 2 o’clock for normal listening.
The M7 has been designed to operate with medium to high output moving coil
cartridges, although it will accept the output of lower level moving magnets as well.
If required there is a small jumper located on the Phono Board that can be moved to
provide an extra 2dB of gain.
The balance control when rotated alters the relative gain between the left and right
channels. Rotating the knob to the left shifts the image left and rotating it to the right
shifts it right.
The source selector allows any of the inputs chosen to appear at the main outputs.
The record selector allows recording of any chosen source and will not interfere with
the source that is being listened to, eg, it is possible to be listening to the CD input
while making a recording from the tuner. Two tape decks can be fitted and dubbing in
either direction is possible.
The mute switch allows manual muting of the preamplifiers outputs. This switch does
not override the automatic mute within the preamplifier.
