Plinius SA-50 Instruction Manual Download Page 2

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Plinius SA-50 instruction manual. Page 2

LIST OF CONTENTS

Warnings and precautions.

Page

Amplifier Facilities and Features. FRONT PANEL.

Amplifier Facilities and Features. REAR PANEL

Amplifier Configuration Selector (ACS)

Installation and operation.

Mains / Line power connection.

Changing the Mains / Line voltage congfiguration

Connections for stereo operation.

Connections for Mono / Bridged operation.

Loudspeakers.

Why is Class A better.

Specifications

Index.

Summary of Contents for SA-50

Page 1: ...ign and the variety of ways it may be used We have designed and manufactured this amplifier to faithfully and accurately reproduce music This hand built instrument should give a lifetime of pleasure and with a little care and a full understanding of the operating recommendation in this manual the Plinius SA 50 should provide trouble free performance THE PLINIUS SA 50 STEREO POWER AMPLIFIER PLEASE ...

Page 2: ...plifier Facilities and Features REAR PANEL 6 Amplifier Configuration Selector ACS 9 Installation and operation 12 Mains Line power connection 13 Changing the Mains Line voltage congfiguration 14 Connections for stereo operation 15 Connections for Mono Bridged operation 18 Loudspeakers 20 Why is Class A better 21 Specifications 22 Index 23 ...

Page 3: ...empt to connect any input of this amplifier to any of its outputs DO NOT earth any output terminal or connect any of these terminals together without following the instructions in this manual or seeking qualified assistance DO NOT place this amplifier in any position where liquids or any foreign material may accidentally enter it DO NOT connect any voltage source short circuit earth ground or appl...

Page 4: ... of turning the amplifier mains power off The switch should be on OPERATE down for all normal listening situations Switch this switch to MUTE up to disconnect the input signal NOTE This switch does not isolate mute or disconnect the OUTPUT of the power amplifier Observe all normal precautions when handling or changing the output loudspeaker leads MAINS SWITCH This heavy duty rocker switch in the c...

Page 5: ...inutes of WARM UP in class a before the very best of the amplifier s sonic qualities may be experienced BIAS A position provides a true class a bias to the output stage therefore ensuring the optimum performance of the amplifier during all critical or casual listening events Class A amplifiers run hotter that class AB amplifiers hence our specially designed and distinctive heat sinks Operating the...

Page 6: ...o this amplifier in a very short space of time without any difficulties at all Please remember that this Plinius SA 50 power amplifier is a high quality electronic instrument capable of an exceptional level of performance Be sure that you understand your requirement fully before you make any connection to this amplifier or adjust the ACS Amplifier Configuration Selector REAR PANEL OF THE SA 50 SHO...

Page 7: ...ED INPUTS LEFT RIGHT XLR connectors fitted to the amplifier are for use with balanced line signals from audio preamplifiers etc Balanced signals are carried via a three way cable that connects all three pins at each end of the interconnect cable XLR pin wiring information is discussed on page 15 DO NOT Operate this amplifier with both RCA and XLR cables connected at the same time INPUT TERMINALS B...

Page 8: ...reo image and or a lack of bass check that the loudspeaker wiring has been connected correctly We recommend that you use one of the easily obtainable test discs to help you ensure both phasing and channel orientation are correct If in doubt consult your Plinius loudspeaker dealer for advice OUTPUT TERMINALS BRIDGED MONO CONNECT the loudspeaker positive terminal to the amplifiers Right channel outp...

Page 9: ...left channel and right channel signals are amplified and output to a stereo pair of loudspeakers This is the most common use of this amplifier MONO Using the built in switching facility ACS both channels of this amplifier combine electronically to form one single amplifier channel Special input and output wiring requirements apply and are explained throughout this manual Balanced or unbalanced inp...

Page 10: ...OT Operate this amplifier with both RCA and XLR cables connected at the same time Now that you will have a basic knowledge of the two types of input and two types or output we will discuss each of the options on the ACS THE ACS OPTIONS ARE AS FOLLOWING RCA STEREO This option provides a stereo output via both left and right output channels from a stereo signal connected to both left and right RCA i...

Page 11: ...h the left and right XLR inputs See pages 7 14 All the advantages of Balanced line transmission will be realised with good rejection of noise and some freedom from earth or ground loops hum Connect the loudspeakers to both channels as discussed in OUTPUT TERMINALS STEREO page 8 15 16 XLR BALANCED MONO The SA 50 operates as a true balanced mono amplifier from input to output This configuration prov...

Page 12: ...nterrupt the flow of air around the amplifier When operating the amplifier in Class A quite a lot of heat is generated which should be allowed to dissipate without restriction Make sure that no objects are placed on top of the amplifier and that the heat sinks cooling fins are not covered or restricted in any way Always ensure adequate ventilation The Plinius SA 50 design incorporates a very high ...

Page 13: ... on the front of the amplifier is OFF before attempting any modification of the mains connection Depress the left hand side of the MAINS switch See page 4 MAINS LINE FUSE A Mains Line fuse is fitted within the IEC Mains Line socket on the rear of the amplifier A small draw at the bottom of this socket may be removed after the IEC plug is removed by levering it out with a flat blade screw driver Th...

Page 14: ...ee Locate the terminal block with a clear perspex guard remove the guard by undoing the M3 nuts The ring terminals can be moved by undoing the cross head screws Use the layout label stuck to the base of the SA 50 to ensure correct orientation of the wires DOUBLE CHECK THE WIRE ORIENTATION BEFORE RE ASSEMBLING THE SA 50 Re assemble the SA 50 and verify correct operation by attempting correct operat...

Page 15: ...he SA 50 SELECT RCA STEREO on the ACS Amplifier Configuration Selector See page 9 XLR inputs are becoming more popular and provide a professional quality of wiring XLR inputs allow the use of fully balanced or quasi balanced signals from preamplifiers CD players and other ancillary equipment to be fed directly to the amplifier The technical advantages of this system of wiring may be fully realised...

Page 16: ... receive corresponding attention The use of low quality preamplifiers or CD players direct should be treated with caution and advice sought from your dealer about the compatibility of these items before connecting them to this amplifier DO NOT Operate this amplifier with both RCA and XLR cables connected at the same time OUTPUT Output connections are provided to allow the use of most types of high...

Page 17: ...e Negative terminal on the amplifier Repeat this process for each loudspeaker PHASING or Polarity It is important to achieve good stereo imaging in your listening room By observing the wiring instructions above each power amplifier loudspeaker combination should be in phase If you experience a poor stereo image and or a lack of bass check that the loudspeaker wiring has been connected correctly We...

Page 18: ... this amplifier and is typically 200 Watts RMS into 8 Ohms Special care must be taken connecting the input signal and loudspeakers to ensure safe operation and best possible performance To achieve a STEREO performance in MONO BRIDGED mode it will be necessary to have and use TWO 2 SA 50 power amplifiers One amplifier for each LEFT and RIGHT channel SECTION OF REAR PANEL SHOWING LOCATION OF RIGHT C...

Page 19: ...low the use of most types of high quality loudspeaker cables The terminals are very robust 5 way binding posts which allow the use of banana plugs bare wires pins spades and looped wire or terminals The hexagonal nut is provided where extra tightening of the terminal is needed or desired and may be used with a suitable spanner This is often necessary with some of the stiff speaker cables used toda...

Page 20: ...in that your loudspeakers can handle most of the rated output power of this amplifier Your may find loudspeaker specifications confusing or misleading therefore you should discuss these fully with your audio dealer prior to purchase The use of medium power 50 Watts RMS or greater loudspeakers are recommended for this amplifier in stereo mode while the use of high power 150 Watts RMS or greater lou...

Page 21: ...ifier is capable of delivering is kept flowing in the circuit regardless of demand In a conventional for Class AB amplifier circuit this current flow varies when demand varies Further as current varies the voltage on the rails as seen by the output stage varies too In a Class A circuit current draw should be constant therefore there is an absence of the power supply modulation common in Class AB d...

Page 22: ... FREQUENCY RESPONSE 20Hz to 20kHz 0 1dB 0dB at 0Hz and 1dB at 120kHz DISTORTION Typically 0 01 THD and IMD at rated power 0 1 THD and IM worst case prior to clipping SATURATION 55 Watts per channel or greater into 8 ohms VOLTAGE SWING 60 Volts peak to peak per channel CURRENT OUTPUT 30 Amps short duration continuous per channel Fuse protected RISE TIME Typically 2 microseconds PHASE RESPONSE 0º at...

Page 23: ...R 19 Mono Bridged operation 18 Mono Bridged outputs 8 20 Mute switch 4 Operating temperature 3 Phase Phasing 8 17 RCA stereo 10 RCA Bridged Mono 11 Stereo Inputs RCA 7 10 15 Stereo Inputs XLR 7 11 15 Stereo Inputs 7 17 Ventilation 12 XLR Balanced Mono 11 XLR pin connections 16 XLR Stereo 11 All operational technical and descriptive material published here is subject to change at any time without n...

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