YouTube Video Series
The following are the links to the playlists followed by a subject index.
Harmonic Distortion: Introduction
Harmonic Distortion V2: Harmonic Generation
Harmonic Distortion Video 3: Design Issues
Harmonic Distortion Video 4: Linear, Ultra-Linear and Tubes vs Transistors
Harmonic Distortion, Video 5: Vg, The Grid Voltage Signal
Harmonic Distortion, Video 6: gm, Transconductance Curve
Harmonic Distortion, Video 7: The 2nd harmonic
Harmonic Distortion, Video 8: Self-Rectification and Grid Leak Bias
Harmonic Distortion, Video 9: The 3rd Harmonic
Harmonic Distortion, Video 10: Why I don't care about the 4th harmonic.
Harmonic Distortion, Video 11 "Key Points to Espley's Method"
Harmonic Distortion, Video 12: "Espley's Linear Transformation"
Harmonic Distortion, Video 13: "Espley's Expansion of Frequency Terms Using Pascal's Triangle"
Harmonic Distortion, Video 14: "Espley's 2nd Harmonic"
Harmonic Distortion, Video 15: "Espley's 4th Harmonic"
Harmonic Distortion, Video 16: "Espley's 6th Harmonic"
Microphone Cupping Data, Part 1: "Introduction &
Test Setup"
Microphone Cupping Data Part 2: "Frequency Response
Curves"
Microphone Cupping Data, Part 3: " Sound Pressure
Level"
Tremolo (TREM1) Signal Analysis of Pumping, Knocking,
Ticking
Tremolo (TREM2) Stopping the Tick, Using a Long-Tail
Resistor, Speed Only Configuration
Tremolo (TREM3) Stopping the Tick Using a Long-Tail
Resistor, Intensity/Depth Configuration
Tremolo (TREM4) EMF
VARIAC® is a registered US trademark of General Radio (in
2004 Instrument Service Equipment obtained the trademark for their equivalent
product). The unit in my “Variac” video series is a similar unit and is
commonly and mistakenly called a VARIAC (it is not). VARIAC sells a UL LISTED
product. Do not operate any unit that does not have a National Testing
Certification (NTC) mark such as UL, CSA, CE, or SA; or until you have the unit
inspected for safety and code compliance. For clarity, the term VARIAC will
refer to the manufacturer who owns the trademark and “Variac” (in quotes) for
units that are similar. "Similar" will be a limited definition of: a
transformer coil with a shared core, two fixed taps, and a variable center tap.
If you purchased one of the common "Variacs" that are red, they are manufactured by China and they are poorly built. First of all, it is not "Made in the USA" and that is false advertising. And these units are not UL Listed. This brand new unit failed and could have electrocuted me. I discovered inside was not code compliant and unsafe. There were many large loose solder drips (one was 1/4" in diameter) and wire jacketing pieces that were not removed after stripping the wire ends. This video series is what I did to make the "Variac" safer. Before operating the unit have it checked by a technician that is familiar the design of an autotransformer.
Subjects in the "Variac" playlist:
Variac
"Variac" Brush Replacement and Retrofit
"Variac" Brush Modification
Variac Brush Alignment and Adjustment
Ground Wire Design and Warning
"Variac" Fuse Location and 2 Rules for Fuses
Taps and Shielding
Variac Rewired
Checkout and Load Test
TS2: Big Muff Tone Stack
TS3 Methodology for Designing a Bright Capacitor
TS4 Fender Tone Stack
TS4a Fender Tone Stack Curves
TS5 Bright Cap for Fender
TS7 Princeton Tone Stack
TS6 Premier Twin 8R Tone Stack
TS8 Twin-t notch filter
TS9 Switching Tone Capacitors