How to Contact Us

Preamps

• Cathode Bypass Capacitor
• Preamp Output Impedance
• Coupling Capacitor
• Bright Boost Capacitor
• Grid Stopper Resistor
• Thermal Noise

Plate & Grid DC Circuits

• 12AT7 High-Mu Dual Triode
• 12AU7 Medium-Mu Dual Triode
• 12AX7 High-Mu Dual Triode
• 12AY7 Medium-Mu Dual Triode

System Design

• Cathode Follower Output Impedance
• LC Ripple Filters
• RC Ripple Filters
• Wire Resistance and Inductance
• Wire Capacitance
• Resistor Power Rating

Fundamentals

• Electric Charge and Electric Current
• Work, Voltage, and Power
• Georg Simon Ohm's Law

Circuit Analysis

• Voltage Division
• Current Division
• Gustav Robert Kirchhoff's Voltage Law
• Kirchhoff's Current Law

Tube Amp Algebra

• Imaginary Numbers
• Complex Impedance
• Gabriel Cramer's Rule
• Pierre-Simon Laplace, etc.

Pentode Preamp Design

• Preliminary Considerations
• DC Circuit Design
• AC Circuit Design

Patented Circuits

• Switchable Single-Ended / Push-Pull
• Variable Harmonic Distortion

Low-Power Techniques

• EF86 Push-Pull Power Amp
• 6L6 Phase Inverter
• Battery-Powered Amps
• Balanced, Symmetrical Distortion

James Tone Stack

• Circuit Analysis
• Creating Your Own Design

Vacuum Tube Technology

• Ultralinear Guitar Amps
• Leo Fender's Calculations
• Pentode Voltage Gain
• Vacuum Tube Technology Circa 1950

Hiwatt CP103 Tone Stack

• Circuit Analysis
• Creating Your Own Design

Fender Bassman Tone Stack

• 5F6-A vs Marshall Plexi
• Bass and Midrange Response
• Treble Response
• Plotted Curves
• Creating Your Own Design

Fender Champ 5E1

• Preamp
• Power Amp
• Negative Feedback
• Power Supply

Vox AC30

• Top Boost Preamp
• Voltage Amp & Cathode Follower
• Power Amp

Fender Bassman 5F6-A

• Overview
• Preamp
• Voltage Amp & Cathode Follower
• Power Amp
• Class AB Power Supply Ripple

Marshall JMP50 1987 "Plexi"

• First-Stage Preamp Circuit
• Second-Stage Voltage Amp
• Grid Bias Supply
• Push-Pull Power Amp