Table Of Contents - Parasound HCA-1205A Owner's Manual

Important Safety Instructions ........................................................................................ 3
Figure #1 HCA-1205A Front and Rear Panel Drawings .............................................. 4
Figure #2 HCA-855A Front and Rear Panel Drawings ................................................ 5
Introduction ..................................................................................................................... 6
Installing and Rack Mounting Your Amplifier ................................................................ 6
Ventilation Requirements for Your Amplifier ................................................................. 6
Making Connections to Your Amplifier .......................................................................... 6
Speaker Connections...................................................................................................... 7
AC Power Connections and AC Grounding .................................................................. 7
DC Trigger Connection .................................................................................................... 8
Operating Your HCA-1205A or HCA-855A ..................................................................... 8
Maintaining Your Parasound Amplifier .......................................................................... 9
In Case of Trouble ............................................................................................................ 9
Parasound HCA-1205A Specifications .......................................................................... 10
Parasound HCA-855A Specifications ............................................................................ 11
Special Features for the Parasound HCA-1205A and HCA-855A
1.6 kVA power transformer, 100,000 uF filter capacitance in the HCA-1205A
1 kVA power transformer, 68,000 uF filter capacitance in the HCA-855A
Multiple polystyrene film bypass capacitors in power supply
Hand-picked complementary transistors in high voltage driver stage
Output transistors direct-coupled to speakers without LRC networks
DC servo direct-coupled audio circuits with 0.8 Hz rolloff
Multiple protection circuits, temperature sensors and silver-cadmium relay protection
L U C A S F I L M
The Parasound HCA-1205A is manufactured under license from Lucasfilm Ltd.
Lucasfilm and THX are trademarks of Lucasfilm Ltd.
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Table of Contents

HCA-1205A Designed by John Curl
HCA-1205A THX certified by Lucasfilm Ltd.
Independent power supplies for each channel
Modular circuit board layout
Massive toroid power transformer
Can be powered with external DC source
Cascode Class A input stages with matched J-FET pairs
15 ampere 50 MHz output transistors
High-bias Class A/AB operation
Gold-plated metal structure RCA input jacks
Glass epoxy circuit boards, double-sided for precision
Custom designed audiophile-grade AC power cord
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