Tube LINKs:
(click on the items below to go to that website)

*Audio Valve LINKs
*EUROTUBES
*Vacuum Tube Valley
*KCA NOS Tubes
*Mullard EL34 production codes
*Phil Loarie's 6L6
*Tube Dictionary
*How Tubes work
*PreAmp Tube Gain  (or 'amplification factor')
*Rectifier Tubes for Guitar amps
*Uncle Spot Tubes
*VTV GUITAR articles
*World TUBE Audio Portal