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Resumen del manual
Please read this manual fully before you attempt to use the Model 12 as it does require some familiarisation before you add it to your music system. Serial Number: Date of Manufacture: Final Test Certified by: PLINIUS M12 Instruction Manual Page 1 INTRODUCTION The Plinius Model 12 Preamplifier is a continuation of the design philosophy embodied in all Plinius Amplifiers and involves the use of assymetrical circuit topology as opposed to the more normal symmetrical approach. The Model 12 is available in either Phono (M12P) or Line (M12L) variations. The M12L can be upgraded to M12P quite readily by the addition of the M12 Phono Circuit Board. The Model12 uses an "on board" power supply which consists of a large value toroidal transformer and a tightly regulated initial power supply system. The main power supply occupies a large circuit board located along with the toroidal transformer in a cabinet beneath the main circuit board and is isolated by an aluminium and Custom Wood shelf. This shelf is a sandwich construction 10mm thick and provides a high mass low resonance structure for the main circuit board. The M12 Chassis is constructed in the main from10mm aluminium with a 12mm aluminium front fascia. We have designed the chassis to be as resonant free as possible and this has great bearing on the 'sound' of the preamplifier. Each stage of amplification has its own individual regulator further adding to the ability of the M12 to recreate the full dynamic range possible with today's source material. 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 Model12 was initially designed to provide superb results from Phono source material, the high level circuits have been optimised for CD and other popular sources. Every component used within the Model12 has been chosen for sonic excellence and all signal cable is by Siltech. All switching is done by high quality silver contact relays and the potentiometers have been selected from Audiophile quality types. The two selector switches on the front panel only activate the relays. They do not carry any audio signals. CONTROLS. The volume control is an ALPS type and will accurately convey the source signals to the high level amplification stages. PLINIUS M12 Instruction Manual Page 2 The M12 has been designed to operate with medium output cartridges ie 1.5mV and above. The Volume Control should be set between 10 o'clock and 2 o'clock for normal listening. 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 control 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 any source that is being listened to eg. it is possible to be listening to the CD Input and be masking a recording from the Tuner. Two Tape decks can be fitted and dubbing in either direction is possible. The Phase Invert switch will change the absolute phase 180 degrees. Some recordings sound better inverted than they do in the normal position due mainly to the recording technique used. Usually this is 'felt' rather than heard and relates to the music being better focused and defined than before. Not all recordings are made the same way and so some experimentation is necessary to find out which is best for you. As a note of caution, the Model 12 Phono stage is inverting and the switch should be in the "Invert" position for you to hear the phono output in a 'non inverted' way. This switch also changes the Balanced Outputs when operated. The high level inputs are all 'non inverting'. The Mute Switch allows manual muting of the Model12 Outputs. This switch does not override the automatic mute which is activated when the preamplifier is first switched on or when it is switched off. The Mute Switch should be used when changing discs and provides an instantaneous interruption to answer the 'phone etc. It is wise to leave the preamplifier in the 'Mute' position when not in use. This will prevent any unwanted signals reaching the amplifier. Do not leave the Volume Control at a high level when the preamplifier is in the 'Mute' mode. Someone may use the system not realising the level is set and a high volume of signal may be sent to the amplifiers. When the Model12 is in the 'Mute' position the LED on the front will be slightly less bright than when operated. PLINIUS M12 Instruction Manual Page 4 INSTALLATION The Plinius Model12 preamplifier should be left switched on at all times. We have purposely fitted the Mains switch on the rear to discourage turning the unit off. If the M...