What do vacuum tubes (valves) do?

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Audio Engineer David Wills’ (Michael Jackson, Whitney Houston) personal toolkit developed from over 30 years in the business.
Perfect for any Musician, Audio Engineer or Music Producer. The kit includes our EQ Cheat Sheet, Live Sound Checklist, Mixing Tricks, Compression Chart & Interviews by Grammy Award Winning Engineers.
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PS: If you want to know what is inside the training we've put the outline below.
INTRODUCTION
Breakdown of course subjects
History of the Electric Guitar
Variables in Signal Chain
WHAT IS TONE?
What is Sound?
Understanding Standing Waves & Harmonics
Nodes and Antinodes
Harmonic Content on Guitar String
Harmonics produced by Distortion
Understanding Modulation
GUITARS
Main Guitar Types
Pickup Demonstrations (all positions)
Fender Stratocaster
Fender Telecaster
Epiphone Les Paul
Epiphone 335 Dot
1967 Gretsch with FilterTrons
1961 Fender Jazzmaster
2007 Duesenberg Starplayer TV
1969 Gibson Les Paul Goldtop with Lollar Imperials
Guitar Controls
Guitar Woods
Necks
Scale Length
Pickup Placement
MIDI Pickups
AMPS
Overview
DIY "Lamington" Tube Amp
How do Tube Amps work?
Tone Stacks
Reading Schematics
Building the "Lamington" Tube Amp
Gain Staging
Fenders
Marshalls
Hi Gain
Amp Effects Loops
Amp Switching
SPEAKERS / MICS
Overview
Specifications
Series / Parallel
Impedance Matching
Miking up Amps
Microphone Positions and Blending
EFFECTS
Overview
Gain (Overdrive, Distortion & Fuzz)
Dynamics (Compressors & Noise Gates)
Flangers
Phasers
Chorus
Tremolo / Vibrato
Rotary Speaker Emulators
Ring Modulators
Wah-wah
EQs
Pitch Shifters
Delays (Slapback, Rockabilly, Ping-pong, Patterned)
Reverb
Loopers
Effect Order
Buffers
RIGS
Overview
Pedalboard Design
True Bypass Loopers
Effect Loops
4-Wire Setup
Wet-Dry Rigs
Wet-Dry-Wet Rigs
ICONIC TONES
Fender Era
Chuck Berry
BB King
Keith Richards
Stevie Ray Vaughan
Brian Setzer
Brent Mason
Marshall Era
Jimmy Hendrix
Eric Clapton
Jimmy Page
Joe Perry
Billy Gibbons
Slash
High-Gain Era
Eddie Van Halen
Randy Rhoades
Zakk Wylde
Eric Johnson
Vox Era
Gretsch / Vox Combo
Duesenberg / Vox Combo
Brian May
GRADUATION!