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Plinius SA-50 Instruction Manual

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Plinius SA-50 instruction manual. Page 1
CONGRATULATIONS on your decision to become the proud owner of the
Plinius SA-50 power amplifier.
This manual has been prepared to help you understand the operation of your amplifier and
to provide some information about its design 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 TAKE TIME TO READ THIS MANUAL THOROUGHLY BEFORE
USING YOUR AMPLIFIER.

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Summary of Contents for Plinius SA-50

  • Page 1 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.

  • Page 2: Table Of Contents

    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.
  • Page 3 Plinius SA-50 instruction manual. Page 3 WARNING The SA-50 power amplifier can be operated in bridged mode and may deliver in excess of 200 Watts into 8 Ohms. This amplifier is also capable of a very large peak current delivery.

  • Page 4: Plinius Sa-50 Instruction Manual

    AMPLIFIER FACILITIES AND FEATURES FRONT PANEL The front panel of the SA-50 power amplifier incorporates a small panel fitted with three switches. These switches control the day to day functions of the amplifier. The operation of these switches is, from the left;...
  • Page 5 This is a bias configuration used by the majority of High End amplifier designers for their products. In "Class AB" the SA-50 produces a very high quality of sound suitable for all occasions where "super" critical listening is not a priority.

  • Page 6: Amplifier Facilities And Features. Rear Panel

    FRONT PANEL FACILITIES AND FEATURES CONTINUED REAR PANEL The facilities on the rear panel of the SA-50 may seem complex. The rear panel incorporates all of the terminals for connecting the input signals and output to the loudspeakers. A reasonable understanding of this amplifier and a logical approach should ensure that you are listening to this amplifier in a very short space of time without any difficulties at all.
  • Page 7 FRONT PANEL FACILITIES AND FEATURES CONTINUED INPUT TERMINALS STEREO Input terminals for this SA-50 power amplifier are easily accessible and fitted to the top centre area of the rear panel. RCA INPUTS LEFT & RIGHT. These standard type RCA terminals are for use with unbalanced signals from most signal sources such as audio preamplifiers.
  • Page 8 Plinius SA-50 instruction manual. Page 8 FRONT PANEL FACILITIES AND FEATURES CONTINUED OUTPUT TERMINALS STEREO OUTPUT CONNECTIONS For the loudspeakers are provided on the left and right hand side of the rear panel. A pair of heavy duty, gold plated five way binding posts for each channel are supplied.

  • Page 9: Amplifier Configuration Selector (Acs)

    Balanced or unbalanced input options will depend on the type of signal available from your preamplifier or other equipment. The SA-50 provides both options to allow you to choose the most suitable preamplifier for your purpose. Plinius preamplifiers offer both balanced and unbalanced output options.
  • Page 10 The terminal plug and socket are most commonly called RCA and can be found on the SA-50 for use as the standard input terminals for both Left and Right inputs.
  • Page 11 (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 provides the highest quality mono performance from a balanced line input connected to the RIGHT BALANCED XLR INPUT.

  • Page 12: Installation And Operation

    (cooling fins) are not covered or restricted in any way. Always ensure adequate ventilation. The Plinius SA-50 design incorporates a very high level of mechanical decoupling of the input and output. It can however still be influenced by acoustical feedback in the operating environment. The use of acoustic cones or a suitably spiked amplifier stand or table may further enhance the performance of this amplifier.

  • Page 13: Mains / Line Power Connection

    Plinius SA-50 instruction manual. Page 13 MAINS / LINE POWER CONNECTION MAINS / LINE POWER connection is via the supplied plug-in lead. The standard IEC socket connects the mains power at the amplifier end while a local mains plug is required at the wall end.

  • Page 14: Changing The Mains / Line Voltage Congfiguration

    Plinius SA-50 instruction manual. Page 14 CHANGING THE MAINS / LINE VOLTAGE CONFIGURATION In the event that your Mains / Line voltage is different to that printed on the back of the SA-50, it may altered by a suitably qualified or experienced person.

  • Page 15: Connections For Stereo Operation

    RCA inputs are the most commonly used and are found on virtually all preamplifiers or other ancillary equipment. For normal STEREO use, connect the left channel output of the preamplifier to the left channel input of the SA-50 and the right channel output of the preamplifier to the right channel input of the SA-50 SELECT "RCA STEREO"...
  • Page 16 Plinius SA-50 instruction manual. Page 16 CONNECTIONS FOR STEREO OPERATION CONTINUED SELECT "XLR STEREO" on the ACS ( Amplifier Configuration Selector). See Page 9. CONNECTIONS to the XLR sockets are; Pin 1 - Earth Pin 2 - + Signal Pin 3 - - Signal...
  • Page 17 Plinius SA-50 instruction manual. Page 17 CONNECTIONS FOR STEREO OPERATION CONTINUED CONNECT the RIGHT hand loudspeaker to the RIGHT CHANNEL OUTPUT terminals on the amplifier. Connect the LEFT hand loudspeaker to the LEFT CHANNEL OUTPUT terminals. Connect the Positive (+) or Red loudspeaker terminal to the + (Positive) terminal on the amplifier.

  • Page 18: Connections For Mono / Bridged Operation

    Plinius SA-50 instruction manual. Page 18 CONNECTIONS FOR MONO / BRIDGED OPERATION MONO / BRIDGED operation of the Plinius SA-50 amplifier is a very high quality method of achieving very high power output without any compromise of performance. Both channels of the SA-50 combine to form a single channel or Mono amplifier.
  • Page 19 Plinius SA-50 instruction manual. Page 19 CONNECTIONS FOR MONO / BRIDGED OPERATION CONTINUED SELECT "RCA BRIDGED MONO" on the AMPLIFIER CONFIGURATION SELECTOR (ACS). XLR balanced line input for the MONO / BRIDGED option use RIGHT channel XLR INPUT. SELECT the "XLR BALANCED MONO" option on the AMPLIFIER CONFIGURATION SELECTOR (ACS).

  • Page 20: Loudspeakers

    Plinius SA-50 instruction manual. Page 20 CONNECTIONS FOR MONO / BRIDGED OPERATION CONTINUED CONNECT THE POSITIVE (+) OR RED TERMINAL OF THE LOUDSPEAKER TO THE RIGHT CHANNEL + (POSITIVE) TERMINAL ON THE AMPLIFIER CONNECT THE NEGATIVE (-) OR BLACK TERMINAL OF THE LOUDSPEAKER TO THE LEFT CHANNEL + (POSITIVE) TERMINAL ON THE AMPLIFIER.

  • Page 21: Why Is Class A Better

    Plinius SA-50 instruction manual. Page 21 WHY IS CLASS A BETTER? Class A has always been regarded as the perfect operating mode for audio amplifiers. Many leading amplifier designers and manufacturers world wide recognise that a well designed Class A circuit has inherently lower distortion than any other design.

  • Page 22: Specifications

    Plinius SA-50 instruction manual. Page 22 SPECIFICATIONS 50 WATTS PER CHANNEL INTO 8 OHMS BOTH CHANNELS DRIVEN FROM 20Hz TO 20kHz AT 0.09% TOTAL HARMONIC DISTORTION FROM 0.25WATTS TO RATED OUTPUT. 100 Watts RMS per channel 20Hz to 20kHz into 4 ohms.

  • Page 23: Index

    Plinius SA-50 instruction manual. Page 23 INDEX Page ACS ( Amplifier Configuration Selector ). 9 Balanced line. Bias switch. Bridging. 9, 18 Class A operation. 5, 21 Class AB operation. Loudspeaker impedance. Loudspeaker power. Mains/Line fuse. Mains/Line power connection. Mains/Line switch.

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