Ok, this not a tube link - just a shameless plug for my band.
A great place for technical discussion about all things tube. Learn alot from folks who know more about vacuum tube amplification than you or I ever will.
Tons of tube data, links and programs. D/L Duncan's tone stack simulator.And his Tube data program. And his spice models.

Owned and operated by Steve Ahola, a frequent ampage'r and generally nice guy. Lots of schematics and organized archives of ampage discussions on many different amp-related topics.

Need a fender amp schematic? Want to know how to correctly date your Vinatge Fender amp? Just like lookin' at pics of really cool old amps?
Fender, Marshall, Mesa-Boogie, Dumble, Gibson, Ampeg, Vox.

Interesting tube circuit ideas. Way more math than my timid brain should be subjected to.

Randall Aiken's Site. A great resource for tube-newbies and experts alike. Mr. Aiken ably explains many common tube circuit functions and how to apply them. Similarly math intensive to Bench's page.
Designer and Distributor of the Plexi OT - an output tranny revered by all ampagers who have purchased and installed it as the second coming of christ ... or at least Ganesh.
A page dedicated to the cooperative design of a wide variety of guitar amps, best know for the low wattage SE AX84 P1.
Great layout drawings for a few amps. Free gainboost mod for marshall/fender. Lots of amp builder's parts available.
More amp parts. Huge stockpile of Magnatone info.
Parts, Schematics, tech info - overall a great timekiller at work.
Parts, Tubes. A bunch of stuff you never knew you needed.
Excellent source of stomp box schematics. Also home of the tube amp debugging guide, a well known resource for homebrewers everywhere.
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A collection of useful Vacuum tube related links on the web