Manual

1
TABLE OF CONTENTS
TABLE OF CONTENTS.............................................................................................................................. 1
INTRODUCTION ......................................................................................................................................... 2
WHY CLASS-A?............................................................................................................................................ 2
WHY TUBES?................................................................................................................................................ 3
WHY BALANCED I/O? .................................................................................................................................. 3
THE A1 DUAL PRE-AMP. ............................................................................................................................. 3
PRECAUTIONS ............................................................................................................................................ 5
BLOCK DIAGRAM...................................................................................................................................... 6
INSTALLATION........................................................................................................................................... 7
AC Mains Supply. .................................................................................................................................... 7
Audio Inputs............................................................................................................................................. 7
Instrument Inputs..................................................................................................................................... 8
Outputs. .................................................................................................................................................... 8
Ventilation................................................................................................................................................ 8
OPERATION. ................................................................................................................................................ 9
Microphone Input .................................................................................................................................... 9
Instrument Input ...................................................................................................................................... 9
Input Gain. ............................................................................................................................................... 9
30dB Pad Switch...................................................................................................................................... 9
Phantom Power. ...................................................................................................................................... 9
Tube Stage Drive and Peak LEDs........................................................................................................ 10
Output Peak LED. ................................................................................................................................. 10
GETTING STARTED ................................................................................................................................ 11
Mic Input:............................................................................................................................................... 12
Instrument Input: ................................................................................................................................... 12
High Pass Filter: ................................................................................................................................... 12
Output Gain: .......................................................................................................................................... 12
Output: ................................................................................................................................................... 12
Tube Stage: ............................................................................................................................................ 13
Metering:................................................................................................................................................ 13
Power Requirements: ............................................................................................................................ 13
Dimensions: ........................................................................................................................................... 13
SERVICE ...................................................................................................................................................... 14