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PLINIUS M12 Instruction Manual Page 5
GROUND LIFT SWITCH
The M12 is fitted with a switch on the rear panel adjacent to the Earth Terminal. This is to allow
the Signal Ground to be either connected to the Chassis Ground or to 'float' above Chassis
Ground.
On some Amplifiers an earth loop or hum can develop if both Signal Grounds are connected to
Chassis Ground. Due to the unique Input Selector arrangement, Plinius SA series Amplifiers
require the driving preamplifier to have the Signal Ground at Chassis Ground for optimum
performance.
SERVICING.
If the Top or bottom covers of the Model 12 Preamplifier are taken off for any reason, remove the
mains Supply Plug first. The Voltages present on the circuit board could be harmful.
In the unlikely event that your Model 12 should require any service please take it firstly to your
Dealer in its original packaging. He will then determine if the unit should be returned to the
factory. Your Plinius Dealer has a good understanding of our Amplifiers and will be able to
advise on any further installation requirements.
CLEANING.
A damp cloth is all that is required to remove dust and finger marks from the Model 12's anodised
surface.