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Designing Tube Preamps for Guitar and Bass / Разработка ламповых предусилителей для гитары и баса

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http://s010.youpic.su/pictures/13912884 ... a2zZ7lJ2xA]Год: 2009
Автор: Merlin Blencowe / Мерлин Бленков
Издательство: Published by Merlin Blencowe
ISBN: 978-0-9561545-0-7
Язык: Английский
Формат: Pdf
Качество: Отсканированные страницы + слой распознанного текста
Количество страниц: 306
Интерактивное оглавление: присутствует

Описание: Designing Tube Preamps for Guitar and Bass is the world''s first comprehensive guide to the design of tube-based preamplifiers, specifically for musical instrument use, in a single volume.
From the input to the phase inverter, this book discusses the inner workings of every part of a conventional guitar preamp, including the use of triodes, pentodes, tone controls, effects loops and much more. Eliminating all ''guess work'' and ''audio myths'', this book reveals the science behind good tone.
Not intended for beginner, it brings intermediate-level circuit designer to advanced level, with over 200 circuit diagrams and figures, as well as new research into the distortion mechanisms of tubes and unique tone-manipulation techniques. An essential reference text for any amp enthusiast!

"Разработка ламповых предусилителей для гитары и баса" - первое в мире всестороннее руководство по разработке ламповых предварительных усилителей, специально предназначенных для музыкальных инструментов, в одном томе.
От входного каскада и до фазоинвертора, в книге обсуждается внутренняя работа типичного гитарного предусилителя, включая использование триодов, пентодов, регуляторов тембра, петли эффектов и многое другое. Исключая все "гадания" и "аудио мифы", эта книга показывает науку, стоящую за хорошим звучанием.
Не предназначенная для начинающих, она поднимет схемотехников среднего уровня на продвинутый уровень, ведь в книге приведено более 200 схем и диаграмм, а также новые исследования механизмов дисторшна в лампах и уникальные техники управления звучанием. Необходимое пособие для любого энтузиаста ламп!

Preface
Acknowledgements
1. The Common Cathode, Triode Gain Stage

Fundamentals of amplification
The load line
Biasing and distortion

Grid-current limiting
Cut-off
Headroom: input sensitivity and the threshold of clipping

Limitations on bias
Applying bias

Fixed bias
Cathode bias
Grid-leak bias

Designing a simple, triode gain stage

Choosing the anode load resistor
Choosing the cathode bias resistor
The cathode load line
Choosing the grid-leak resistor
Calculating power ratings

The valve constants

Transconductance
Amplification factor
Anode resistance

Mathematical treatment of a gain stage

The cathode bypass capacitor
Other cathode bypass circuits
Input and output impedance
The Miller effect
Cathode biasing with diodes

Summary of formulae

2. Coupling

The amplifier''s input

The input grid-stopper

Fundamentals of interstage AC coupling
The AC load line
Blocking distortion and grid stoppers
Practical AC coupling networks

Wide-band attenuation
Treble boost (bass cut) and ''bright'' capacitors
Treble cut (bass boost) and anode bypass capacitors

DC coupling

Direct coupling
Level shifting

Summary of formulae

3. The Small-Signal Pentode

The suppressor grid (g3)
The screen grid (g2)

The effect of screen voltage
The effect of screen current

Pentodes connected as triodes
Noise in pentodes
Designing pentode gain stages

Choosing the anode resistor
Choosing the screen voltage
Adapting the anode characteristics for any screen voltage
Choosing the cathode bias resistor
Designing the screen-supply circuit

Mathematical treatment of the pentode gain stage

Gain
The effect of screen bypassing
The effect of cathode bypassing
Output impedance
Input capacitance

Switchable and variable pentode designs

Triode/pentode switches
Variable screen bypassing
Triode/pentode ''morph'' control

Summary of formulae

4. Valves in Parallel

The Matchless input stage
The common-anode mixer
Switchable designs

5 .The Cathode Follower

Fundamental parameters of the cathode follower

Gain
Input capacitance
Input impedance
Output impedance

Graphical analysis
Biasing arrangements for AC-coupled cathode followers

Fixed bias
Cathode bias

DC-coupled cathode followers
The pentode as a cathode follower
Cathode followers in guitar amps
Bootstrapping for more gain
Summary of formulae

6. The Cascode

Basic operation of the cascode
The effect of the ''screen grid'' voltage
Deriving anode-characteristics graphs
Fundamental parameters of the cascode

Gain
Input capacitance
Output impedance

Designing a cascode

Applying fixed bias to the upper triode
Choosing the cathode bypass capacitor
Applying cathode bias to the upper triode
Applying grid-leak bias to the upper triode

Current-boosted cascodes
Summary of formulae

7. The Cathodyne Phase Inverter

Fundamental parameters of the cathodyne phase inverter

Gain
Input capacitance
Input impedance
Output impedance
Output bandwidth

Designing a cathodyne
Biasing arrangements for AC-coupled cathodynes

Fixed bias
Cathode bias

DC-coupled cathodynes
Overload characteristics of the cathodyne

The ''gain-spike'' effect
The frequency-doubling effect
Avoiding unpleasant distortion effects

bootstrapping for gain
Summary of formulae

8. The Long-Tailed Pair Phase Inverter

Basic operation of the long-tailed pair
Fundamental parameters of the long-tailed pair

Input capacitance
Input impedance
Output impedance
Input sensitivity

Designing a long-tailed pair
DC-coupled long-tailed pairs
AC-coupled long-tailed pairs

Fixed bias
Cathode bias

Global negative feedback and the long-tailed pair

A worked example; the Fender 5F6-A Twin Amp
The presence control
Variable feedback

Presence control without global negative feedback
''Scale'' control
Overload characteristics of the long-tailed pair
Summary of formulae

9. Feedback Theory

The universal feedback equation
Practical, local-feedback amplifiers
Effect on linearity, noise and frequency response
Effect on input and output impedance
Practical, virtual-earth amplifiers
Effects on overdrive
Stability and limitations on feedback

Stabilising a feedback amplifier

Global feedback in practice

Choosing the feedback resistor

Summary of formulae

10. Tone controls and tone stack

Notes on impedance bridging
Notes on design

Basic, ''one knob'' tone controls

Treble
Bass
Middle
Tilt control

Tone stacks

The Bandmaster tone stack
The Voigt tone stack
The James tone stack
The passive Baxandall tone stack
The FMV tone stack

Designing an FMV tone stack
Expanding the MFV tone stack

Ultra-low switch
Defeat / lift
Shift control

11. Effects Loops

Line levels
Send, line out and loop drivers

Simple line-out arrangements
Active loop drivers

Recovery stages and serial effects loops

Passive serial loops 264
Active serial loops

Parallel effects loops

Passive parallel loops
Active parallel loops

12. Notes on Construction

Grounding

The earth bond
Ground loops
Bus grounding
Star grounding

The power supply
The heater supply

Heater lead dress
Hum balance
Heater elevation

A note on lead dress

Bibliography
Index