5
TUBE ULTRA-Q T1951
TABLE OF CONTENTS
1. INTRODUCTION.....................................................................................................................6
1.1 The concept .................................................................................................................................... 6
1.2 Before you get started ..................................................................................................................... 6
1.3 Control elements ............................................................................................................................. 7
2. OPERATION ............................................................................................................................9
2.1 Introduction ..................................................................................................................................... 9
2.2 The TUBE ULTRA-Q in the signal path ........................................................................................... 9
2.3 Filter settings .................................................................................................................................. 9
2.4 Setting of the tube stage ................................................................................................................ 11
3. APPLICATIONS ..................................................................................................................... 11
3.1 Filtering out unwanted frequencies ................................................................................................. 11
3.2 Shelving filters and Roll Off.......................................................................................................... 12
3.3 Equalizers as creative audio tools ................................................................................................. 12
3.4 The TUBE ULTRA-Q as tube interface ........................................................................................... 14
3.5 EQ-ing a P.A. system ................................................................................................................... 14
4. TECHNICAL BACKGROUND ..............................................................................................16
4.1 Function........................................................................................................................................ 16
4.2 The Constant-Q principle............................................................................................................. 16
4.3 The concept of parallel filters ......................................................................................................... 16
4.4 On phase shift and time delay....................................................................................................... 17
4.5 Tubes used in the TUBE ULTRA-Q ................................................................................................ 17
4.5.1 Tube history........................................................................................................................ 17
4.5.2 Design and functional principle of tubes .............................................................................. 18
4.5.3 Properties of tubes .............................................................................................................. 19
4.5.4 The best of both worlds ....................................................................................................... 19
4.5.5 UTC circuit .......................................................................................................................... 20
4.5.6 Studio applications .............................................................................................................. 20
5. INSTALLATION .....................................................................................................................21
5.1 Rack mounting .............................................................................................................................. 21
5.2 Mains voltage ................................................................................................................................ 21
5.3 Audio connections ........................................................................................................................ 21
5.4 Transformer-balanced outputs (optional) ........................................................................................ 22
6. SPECIFICATIONS .................................................................................................................23
7. WARRANTY ...........................................................................................................................24
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