Merlin Blencowe / Мерлин Бленков - Designing Tube Preamps for Guitar and Bass / Разработка ламповых предусилителей для гитары и баса [2009, PDF, ENG]

Preface
Acknowledgements
1. The Common Cathode, Triode Gain StageFundamentals of amplification
The load line
Biasing and distortionGrid-current limiting
Cut-off
[*]Headroom: input sensitivity and the threshold of clippingLimitations on bias
Applying biasFixed bias
Cathode bias
[*]Grid-leak biasDesigning a simple, triode gain stageChoosing the anode load resistor
Choosing the cathode bias resistor
The cathode load line
Choosing the grid-leak resistor
[*]Calculating power ratingsThe valve constantsTransconductance
Amplification factor
[*]Anode resistanceMathematical treatment of a gain stageThe cathode bypass capacitor
Other cathode bypass circuits
Input and output impedance
The Miller effect
[*]Cathode biasing with diodes[*]Summary of formulae[*]2. CouplingThe amplifier's inputThe input grid-stopperFundamentals of interstage AC coupling
The AC load line
Blocking distortion and grid stoppers
Practical AC coupling networksWide-band attenuation
Treble boost (bass cut) and 'bright' capacitors
[*]Treble cut (bass boost) and anode bypass capacitorsDC couplingDirect coupling
[*]Level shifting[*]Summary of formulae3. The Small-Signal PentodeThe suppressor grid (g3)
The screen grid (g2)The effect of screen voltage
[*]The effect of screen currentPentodes connected as triodes
Noise in pentodes
Designing pentode gain stagesChoosing the anode resistor
Choosing the screen voltage
Adapting the anode characteristics for any screen voltage
Choosing the cathode bias resistor
[*]Designing the screen-supply circuitMathematical treatment of the pentode gain stageGain
The effect of screen bypassing
The effect of cathode bypassing
Output impedance
[*]Input capacitanceSwitchable and variable pentode designsTriode/pentode switches
Variable screen bypassing
[*]Triode/pentode 'morph' control[*]Summary of formulae4. Valves in ParallelThe Matchless input stage
The common-anode mixer
[*]Switchable designs5 .The Cathode FollowerFundamental parameters of the cathode followerGain
Input capacitance
Input impedance
[*]Output impedanceGraphical analysis
Biasing arrangements for AC-coupled cathode followersFixed bias
[*]Cathode biasDC-coupled cathode followers
The pentode as a cathode follower
Cathode followers in guitar amps
Bootstrapping for more gain
[*]Summary of formulae6. The CascodeBasic operation of the cascode
The effect of the 'screen grid' voltage
Deriving anode-characteristics graphs
Fundamental parameters of the cascodeGain
Input capacitance
[*]Output impedanceDesigning a cascodeApplying 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 triodeCurrent-boosted cascodes
[*]Summary of formulae7. The Cathodyne Phase InverterFundamental parameters of the cathodyne phase inverterGain
Input capacitance
Input impedance
Output impedance
[*]Output bandwidthDesigning a cathodyne
Biasing arrangements for AC-coupled cathodynesFixed bias
[*]Cathode biasDC-coupled cathodynes
Overload characteristics of the cathodyneThe 'gain-spike' effect
The frequency-doubling effect
[*]Avoiding unpleasant distortion effectsbootstrapping for gain
[*]Summary of formulae8. The Long-Tailed Pair Phase InverterBasic operation of the long-tailed pair
Fundamental parameters of the long-tailed pairInput capacitance
Input impedance
Output impedance
[*]Input sensitivityDesigning a long-tailed pair
DC-coupled long-tailed pairs
AC-coupled long-tailed pairsFixed bias
[*]Cathode biasGlobal negative feedback and the long-tailed pairA worked example; the Fender 5F6-A Twin Amp
The presence control
[*]Variable feedbackPresence control without global negative feedback
'Scale' control
Overload characteristics of the long-tailed pair
[*]Summary of formulae9. Feedback TheoryThe 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 feedbackStabilising a feedback amplifier[*]Global feedback in practiceChoosing the feedback resistor[*]Summary of formulae10. Tone controls and tone stackNotes on impedance bridging
[*]Notes on designBasic, 'one knob' tone controlsTreble
Bass
Middle
[*]Tilt controlTone stacksThe Bandmaster tone stack
The Voigt tone stack
The James tone stack
The passive Baxandall tone stack
[*]The FMV tone stackDesigning an FMV tone stack
Expanding the MFV tone stackUltra-low switch
Defeat / lift
[*]Shift control11. Effects LoopsLine levels
Send, line out and loop driversSimple line-out arrangements
[*]Active loop driversRecovery stages and serial effects loopsPassive serial loops 264
[*]Active serial loopsParallel effects loopsPassive parallel loops
[*]Active parallel loops12. Notes on ConstructionGroundingThe earth bond
Ground loops
Bus grounding
[*]Star groundingThe power supply
The heater supplyHeater lead dress
Hum balance
[*]Heater elevation[*]A note on lead dressBibliography
[*]Index