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Resources
Blue Glow in Tubes
Everything you ever wanted to know about biasing a tube amp
F.A.Q.s
Fender Amp Preamp Tube Layout and recommendations
Modern EL84 amps and NOS EL84s
Preamp Tube Gain and Compatibility Guide
Rectifier comparison and interchangeability chart
Tube Recommendations
Tube Testing and Matching
Tubes 101: What every guitar player should know about tubes
User Tube Reviews (By amplifier)
User Tube Reviews (By tube type)