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Table of Contents
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
HCA-1205A Designed by John Curl
HCA-1205A THX certified by Lucasfilm Ltd.
Independent power supplies for each channel
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
Modular circuit board layout
Massive toroid power transformer
Multiple polystyrene film bypass capacitors in power supply
Can be powered with external DC source
Cascode Class A input stages with matched J-FET pairs
Hand-picked complementary transistors in high voltage driver stage
15 ampere 50 MHz output transistors
Output transistors direct-coupled to speakers without LRC networks
DC servo direct-coupled audio circuits with 0.8 Hz rolloff
High-bias Class A/AB operation
Gold-plated metal structure RCA input jacks
Multiple protection circuits, temperature sensors and silver-cadmium relay protection
Glass epoxy circuit boards, double-sided for precision
Custom designed audiophile-grade AC power cord
The Parasound HCA-1205A is manufactured under license from Lucasfilm Ltd.
Lucasfilm and THX are trademarks of Lucasfilm Ltd.
LUCASFILM
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