Other builders/related:

Creston Guitars
Awesome electric guitar builder from Burlington

Healy Guitars
Talented Luthier from Western Massachusetts

Machines With Magnets
Kick ass venue and recording studio down the road from here

Grey Market Mastering
Masters of the Universe!

Resources:

tubebooks.org/technical_books_online.htm
Just a pant load of excellent old electronics texts

valvewizard.co.uk
A tube amp luminary

preservationsound.com
Fascinating blog full of great projects and vintage electronics ephemera

radioblvd.com
Nice site full of beautiful old communications gear